Organizer: Guillaume Duclos Brandeis University, gduclos brandeis. Active fluids refer to viscous suspensions of active entities that can convert internal or free energy into mechanical work. This encompasses living systems composed of biopolymers with molecular motors or swimming bacteria.
The field of active matter has been quite successful at describing dynamical pattern formation in out-of-equilibrium fluids, but quantitative measurement of the microscopic active stresses and how they affect the emergence of collective flows and the rheological properties of the material are still missing. Indeed, the nature and the amplitude of the active stress have been hypothesized based on single filament or single cell measurements but their quantification is very difficult in dense active suspensions. These measurements are fundamental because they provide the missing link between theory and experiments that will lead to more quantitative descriptions of living matter.
The goal of this focus session is to expose the members of GSOFT and of the related divisions DPOLY and DBIO to some of the most recent and exciting work on soft active materials composed of active polymers or living cells, with a special focus on quantitative measurement of the active stresses as well as their macroscopic rheological properties. After recent breakthroughs in the search for ordered optimal tessellations for example, including Frank-Kasper phases in copolymer melts , now findings of the optimal properties of amorphous tessellations are emerging, e.
At the same time, there have been intensive studies of amorphous systems with an anomalous suppression of density fluctuations on large length scales, known as hyperuniformity. This geometric concept qualitatively and quantitatively characterizes a hidden-order in amorphous states that allows for unique physical properties--combining those of crystalline and disordered phases.
Thus it offers candidates for optimal amorphous tessellations of space. This session will foster a discourse between these subfields and about the role of hyperuniformity in the search for tessellations that are optimal with respect to geometrical and physical properties. The session will discuss both a theoretical understanding, computational exploration and experimental verification of the temporal evolution of growing or compressed soft cellular entities and the formation of surprising ordered and amorphous phases and their unexpected structures and physical properties.
The applications range from functional designer materials to the cell biology of membrane organelles. Materials processing is the series of operations that transform rawmaterials into parts or finished products. These processes ofteninclude mechanical instabilities and geometrical nonlinearitiesarising from the coupling of elasticity with other phenomena such asplastic deformation, chemical reactions, fracture, and adhesion,topics that have attracted much recent interest in the physicscommunity. Topics of interestinclude casting, forming, machining, web handling, surface coatings,welding and joining, laser processing, and 3D printing, as applied tometals, soft materials, functional materials, advanced composites, andmore.
These applied processes can be looked at from a fundamentalpoint of view in terms of instabilities, wave propagation,nonlinearities, inverse problem formulation, active materials, andelasticity of slender structures. This session aims to bring togetherresearchers from diverse backgrounds in materials processing,structural mechanics, applied mathematics, materials science, and softmatter physics, to open new areas of interdisciplinary research.
Active matter is an exciting, current topic of discussion. Recent exciting results on enzymes and their ability to enhance their diffusion rates due to catalytic turn-over have advanced the ideas that the principles of self-organization in active systems are relevant at nanoscales of individual proteins. In addition, these proteins have been used as propellants for larger, microscale active matter systems, so understanding their mechanism of action at the enzyme level will inform their mechanism in groups and as fuels.
Organizers: Jennifer L. Ross University of Massachussetts, Amherst, rossj physics. Fracture mechanics are at the foundation of understanding material integrity. In light of the many applications for soft materials that have developed recently, having an understanding of the failure modalities of these materials is important.
This session will be distinctive in its focus on fracture and failure mechanisms in soft materials as opposed to more traditional brittle solids. In contrast to many construction materials such as glass and concrete, fracture in soft materials is likelier to occur at large deformations, and soft materials have a plethora of dissipative mechanisms available to them to prevent stress localization; thus the nature of the material is important.
Soft matter structure and dynamics remains a theoretical and experimental challenge. It is a timely opportunity to investigate how this fundamental understanding underpins new functionalities of soft materials spanning robotics, medicine, and energy. This focus session gathers the latest advances on collective structure formation and dynamics to guide new functions in soft materials.
Aspects of self-assembly within liquid crystals, ionic liquids, and other complex media will be covered, balancing theory, computation and experiments.
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Soft matter encompasses a wide range of systems including multi-phase flows, gels, porous structures and powders. These systems are not just scientifically interesting; they are also encountered in many industrial contexts including energy, pharmaceutics, food, consumer products and healthcare. Identifying common interests and challenges in this theme across academia and industries should bring both new fundamental insights and help find solutions to tackle practical challenges. Many soft matter systems are multi-particular, multi-component, or multi-phase in nature.
Precisely the lack of solid understanding of their interface dynamics is often a limiting factor in industrial settings, for example in materials processing. This focus session is also dedicated to Bob Behringer, who helped with organization of the session before his passing. The remarkable properties and functions of natural materials emerge upon assembly of biomolecular components into hierarchical structures. Material scientists have long been inspired by nature seeking to use bioinspired design principles to engineer materials with superior properties.
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Recent years have witnessed a wave of renewed interest in designing bioinspired materials and structures especially following the rapid development of modern fabrication technology, such as nanofabrication and 3D printing. For example, a number of novel top-down or bottom-up fabrication approaches have been developed to tailor materials into bioinspired structures with a variety of superior mechanical such as ultra-lightweight, ultra-tough, ultra-strong and ultra-stretchable , optical such as structural coloration, anti-reflection and optical lenses , thermofluidic such as omniphobicity, water harvesting, anisotropic fluid transport , and other properties.
These complex materials are typically hierarchical and multiphase, with heterogeneities, including particle and fiber inclusions, pores, internal interfaces, and gradients that impact properties, as well as multiple bonding schemes, both dynamic and covalent, offering new time and length scales for reconfiguration. Moreover, various activation mechanisms have been introduced to trigger biomimetic movements or structural deformations, thus resulting in active, adaptable and stimuli-responsive materials.
Understanding the physics governing formation of novel bioinspired materials and their stimuli-responsive behaviors is the key challenge to advance their design and uncover their potential. The goal of this session is to create a platform for experts working on bioinspired materials, to discuss the underlying novel material physics across different length and time scales and its role in determining functional material properties.
We expect this session will become a unique forum that not only provides the physical understanding of bioinspired materials, but also offers physical insights to advance the design of future bioinspired systems for broad applications by addressing the current scientific and technological challenges. Liquid-liquid phase separation LLPS is now being understood as a key biophysical mechanism used by cells. Using LLPS cells create dynamic non-membrane bound droplets of macromolecules e. How LLPS is controlled in space and time remains elusive and understanding requires a combined framework of biology and physics.
From the biology perspective, it is critical to understand how mesoscale material properties of droplets arise from and are selected for in evolution at the levels of individual molecules. From the physics perspective, new non-equilibrium physical modeling is required to understand these states of active matter that are ubiquitous but variable in cells.
This focus session will bring together soft matter physicists, biophysicists and biologists on this important problem to promote interdisciplinary exchange. Suspensions of swimming micro-organisms are a paradigmatic model of a system driven out of equilibrium, that has attracted wide interest in recent years from both experimentalists and theoreticians. Understanding their properties is in fact a key problem in the physical and biological sciences, not only because they can be exploited to address conceptual questions regarding general characteristic features of out-of-equilibrium systems, but also because of their potential technological application, particularly for improving the design of artificial nanoscale carriers.
This proposed session aims at providing an overview of the state-of-the-art of both theoretical and experimental research on micro-swimmers' suspensions. The focus will be in particular on the development of micro-swimmers' models, on the study of their hydrodynamic flow fields and interactions and on their relation to enhanced diffusive phenomena in active matter systems. We believe that this outline can be of exceptional interests for the membership of GSOFT and related units, as it will build a comprehensive framework whereby identifying potential new challenges that can pave the way for further advancement in the field.
Sano Ritsumeikan University, Shiga Japan, tomohiko gst. One of the important and current challenges in non-equilibrium statistical mechanics is to uncover the underpinnings of organization occurring in highly non-equilibrium conditions. Such enquiry is crucial in many contexts, including biophysics, and nanoscale materials science engineering. This proposed focus session will bring together researchers studying self assembly and organization in highly dynamic non-equilibrium conditions. Apart from appealing to more conventional driven self assembly applications, we anticipate that this focus session will be of interest to researchers studying organization in active matter systems, systems driven by external fields, driven chiral fluids, and even non-equilibrium morphological transformations such as those occurring in assemblies of actin or microtubules driven by molecular motors.
The focus session can help bring together researcher working on these diverse areas and identify common physical principles. Organizers: Arnold J. Mathijssen Stanford University, amath stanford. Active and driven biopolymer networks, such as networks of cytoskeleton proteins, have been intensely investigated over the past decade due to their promise for designing smart materials and understanding cell mechanics.
These materials continuously alter their mechanical properties by varying the structural properties and interactions of the comprising biopolymers. Non-equilibrium activity can be driven by external triggers such as light, salt, temperature, or magnetic or electric fields. Activity can also be internally driven via molecular motors.
This session will bring together studies on a wide-range of non-equilibrium biopolymer networks to elucidate the functional design principles of driven soft matter, as well as the time-dependent structural and rheological properties of these non-equilibrium networks. Advances in modulating and characterizing driven networks will also be discussed. Gels, nonfluid networks of particles or polymers that are pervaded by fluid, appear ubiquitously within soft matter in practical applications as well as in living biological systems.
The mechanical properties of gels are intermediate between those of fluids and solids, and depend sensitively on the structure of the gel constituents across multiple length scales. This focus session invites experimental, theoretical, and computational studies of the rheological properties of gels, including chemical and physical gels, hydrogels, colloidal gels, and biological gels, with particular interest and emphasis on connecting structural properties to flow properties. Contributions examining the effect of non-equilibrium activity driven by molecular motors or by active particles on gel mechanics are encouraged.
Organizers: Emanuela del Gado Georgetown University, ed georgetown. The success of Network Science as a discipline is often attributed to two factors. The first fact is the universal language allowing it to represent diverse complex systems, ranging from brain to the Internet, as networks and graphs. The second is a series of recent technological advances allowing for efficient collection and sharing of large amounts of data behind complex systems.
The tremendous growth of Network Science would not be sustained, however, without network-theoretic results offering rigorous tools for modeling of both complex systems and dynamics processes taking place on them. This focus session on network theory will feature a wide array of topics including statistical mechanics of networks, graph theory, nonlinear dynamics on and of networks as well as resilience and control.
The session will stimulate the discussion between the domain experts studying specific complex systems and theorists working on theoretical and computational aspects of network science. Organizers: Maksim Kitsak Northeastern University, maksim. From foil balloons to parade floats, inflatable furniture to beach balls and party balloons, inflatable structures are ubiquitous and often mundane objects with surprisingly rich mechanical behavior that challenges our understanding of the nonlinear coupling between geometry and mechanics of low dimensional objects.
Balloons adopt complex shapes when inflated, fold and crease when pocked and may burst in multiple pieces. As such, balloons are used as model systems for studies on fracture, fragmentation, wrinkling, and even phase transitions. These structures find applications in engineering e. Similarly, encapsulating membranes are ubiquitous in biology, where their mechanics in large deformation often plays a functional role e. We are seeking submissions that focus on the theoretical and experimental investigation of the behavior of membranes and balloons. We are particularly interested in exploring the role of geometry, frustration and nonlinearities in these systems.
Many structures in nature and engineering are assembled from discrete building blocks, thereby exhibiting new or enhanced functionalities as compared to their continuum counterparts. Examples include bridge trusses, fold patterns in fans and coffee filters, fish scales, and nacre. More broadly, discreteness also arises naturally in the study of elasticity and deformation, whether in computational models, experimental structures, or architectural designs. In mathematics, significant fundamental leaps have occurred in the past few decades in translating concepts from differential geometry into the discrete setting.
These advances in discrete differential geometry DDG have both contributed to, and benefited from, a burgeoning activity in computer graphics aimed at geometrically exact descriptions in physics-based algorithms. The simulation of slender structures is particularly well-suited to this framework given the primary role of the underlying geometry.
These developments in DDG and computational geometry have been slow to permeate into the physics and mechanics communities, but recent successful cases have highlighted the tremendous potential for predictive modeling tools. Conversely, ongoing activity in the soft matter community metamaterials, slender elastic rods, kirigami, shells is providing new challenges that may push DDG and computer graphics into new areas.
This effort will be the first of its kind at the APS March meeting. We particularly wish to highlight the application to real physical systems of techniques originally developed for computer graphics, but also welcome contributions in all areas of discrete mechanics and geometry, broadly interpreted. Topics of interest include discrete representations of surfaces and geometric quantities, variational integrators, geometric flows, splines and isogeometric analysis, tension field theory, pseudo-rigid bodies, and other reduced models of thin structures, as well as the mechanics of gridshells, truss networks, fabrics, nets, frames, folds, and linkages.
The session will stimulate discussions and collaborations between kindred communities of applied geometers in physics and computer graphics. Recently, there has been impressive experimental and theoretical progress concerning the dynamical properties of noise-driven systems that are far-from-equilibrium. For example, researchers are now able to directly construct stationary, non-zero probability current densities in biophysical systems such as beating flagella.
Such measurements provide direct evidence of detailed balance violation, an essential feature in the functioning of many non-equilibrium systems.
At the same time, there is substantial theoretical effort to understand fluctuation properties in such systems by proposing new quantitative approaches to characterize breaking of detailed balance. This session is targeted to both experimentalists and theorists from a range of traditional fields spanning biophysics, climate modeling, and condensed matter physics, for whom it will be stimulating to explore the common set of emerging experimental techniques and analytical tools for understanding the noisy dynamics of far-from-equilibrium systems.
Fluid-structure and granular-structure interactions occur across many length scales within synthetic and biological systems. Fundamental problems that couple fluids within and around deformable bodies have direct relevance to pattern formation, the growth of soft tissues, the emergence of geometric nonlinearities, morphable structures, and fluid transport.
Similarly, the physics of elastic structures within granular and fragile matter have important biomechanical connections to plant root growth, ectoparasite feeding, and burrowing animals. Recent research in this area has explored extremely deformable solids interacting with granular materials, the interactions of nontrivial fluids with flexible membranes, and the behavior of a fluid within a swollen elastomer. These research trends have highlighted the importance of understanding the roles of the elastic material and the slender structure in these coupled interactions with fluids and granular matter.
This session aims to bring together researchers from diverse backgrounds in structural mechanics, granular physics, fluid mechanics, materials science, soft matter physics, and biomechanics, to open new areas of interdisciplinary research. Today, exploiting breakthroughs in computation and experiment together with the unprecedented understanding of fully nonlinear dynamical systems we are equipped better than ever to address the subtle issues surrounding the loss of stability in thin elastic systems and buckling.
As a result, the problem is experiencing a renaissance where new material and methods are leverage to develop contemporary approaches to tackle the classical problem of predicting when and how thin shell structures buckle and collapse. Organizers: Shmuel M. Rubenstein Harvard University, Shmuel seas. Schneider EPFL, tobias. Living organisms are non-equilibrium systems that span an enormous range of scales.
Statistical physics governs the nature of the emergent phenomena observed in these complex systems. In macroscopic ecology, one observes approximate power law scaling with predictable relationships between the exponents. At the microscopic level, the notion of phases and transitions between them provide novel insights on the common properties of proteins, the molecular machines of life.
This focus session highlights this rich subject and the power of statistical physics in understanding life across scales. The field of mechanical metamaterials aims at the development and understanding of materials that get their mechanical properties from their geometries, rather than solely from their chemistry. Thanks to the advent of advanced fabrication and computational techniques, the field has seen an explosion of activities. Particularly exciting directions include the creation of materials with novel and extreme mechanical properties i. Lying at the cusp between physics, engineering, and mathematics, this session aims at bringing together researchers from diverse backgrounds to forge new interdisciplinary connections.
Overvelde amolf. Liquids, ubiquitous on earth, are prototypical disordered condensed matter. Its very existence is remarkable, thanks to the delicate balance between interparticle potential and entropy. The phase behaviors of liquids and liquid-like matter, especially when driven out of equilibrium by extreme conditions, are exceptionally rich.
Accordingly, the physics of liquids have attracted much attention in the recent decades. In addition, numerous soft and biological materials of amazing far-from-equilibrium complexity seem to share many intriguing features of liquids. Therefore, quantitative descriptions of the structure and dynamics of liquids and liquid-like matter will likely impact a wide range of disciplines in physics, chemistry, and materials science and engineering. This session will focus on the forefront of the research on liquids, from fresh theoretical treatments and computations to cutting-edge experimental techniques.
Machine learning approaches offer promising methods to accelerate the discovery of new materials with tunable properties. This session will focus on machine learning approaches to design novel bulk metallic glasses and other glass-forming materials. To date, the materials community has tested the glass-forming ability of only an extremely small fraction of the possible metal alloys.
Coupling high-throughput fabrication and characterization techniques with machine learning approaches will enable researchers to explore an unprecedentedly large composition space of metallic glasses. This focus session seeks abstracts from interdisciplinary researchers in physics, materials science and engineering covering experimental and computational design of new glass-formers with optimized properties, structure-property relationships, and high-throughput fabrication and characterization techniques.
We believe that this focus session will catalyze new collaborations aimed at the discovery of new metallic glasses. Organizers: Corey S. O'Hern Yale University, corey. This focus session builds on recent progress on pattern formation in granular systems, ranging from planetary surface and subsurface to active soft matter. This session can bring focus to this area in which there has been substantial progress on fundamental modeling and experiments focused on an individual component of the rich fluid driven pattern formation in these systems.
But the relationships if any among these different systems remain unclear and are actively being examined by several groups. This focus session seeks to attract contributions from all of these fields and more to expose and, hopefully, clarify these relationships. Organizers: David K. Campbell Boston University, dkcampbe bu. Physical manipulation of single biomolecules, including DNA, RNA, proteins, and macromolecular filaments, have found many powerful applications in studying biophysical properties and processes.
Techniques include optical tweezers, magnetic tweezers, atomic force microscope cantilevers, and hydrodynamic flow. Applications have included studies that have shed light on fundamentals of biopolymer mechanics, protein-DNA interactions, protein and RNA folding, and molecular motor function. This focus session will explore traditional techniques and applications of single molecule manipulation techniques and developments of new approaches and applications. Information needed by all cells to survive and proliferate is encoded in the sequence of nucleotides in genomic DNA.
In eukaryotes, DNA is packaged into chromatin — a complex multi-scale structure which ensures that all chromosomes into the tight of the cell nucleus. However, DNA in this packaged state must either remain accessible to various regulatory proteins such as transcription factors which turn genes on and off or be made accessible rapidly and robustly in response to various challenges facing the cell throughout its life cycle. This dilemma of packaging and accessibility has recently attracted a lot of attention from the biological physics community, with methods from polymer physics, statistical mechanics, and condensed matter physics being applied to understand DNA folding and dynamics, protein-DNA interactions, and chromatin structure and function.
This session will focus on the latest developments in this rapidly advancing field, bringing together experimental and theoretical scientists in the fields of chromatin, DNA, and protein-DNA recognition. Organizers: Alexandre V. Morozov Rutgers University , Gary D. Stormo Washington University, stormo wustl. Proteins and nucleic acids play important roles in many biological processes.
Understanding and predicting their structures, dynamics, interactions, and energetics are highly valuable to uncover the mechanisms of these processes and to design therapeutic interventions. The physics community is continuing to provide key contributions to this field. We deliberately give a general title for the session to attract broad audience DBIO, chemical physics, computational physics, and optics. The first invited speaker, Mike Gilson, is a world-renowned scientist studying the physical basis of molecular interactions e.
Their talks will be interesting to DBIO and physicists on physical chemistry, computational chemistry and optics. Both co-organizers are women, and will strongly encourage minorities and women to give contributed talks. This focus session will explore the physics of cytoskeletal systems on length scales ranging from the molecular to the cellular, and across disciplines, bringing together approaches ranging from structural biology to measurements of network dynamics to modeling in order to reveal the physical mechanisms of cellular behavior.
We will focus on work that connects molecular level features with higher-level properties of cytoskeletal filaments and their assemblies. Our emphasis will include how such properties enable and control cellular and tissue function, and how stresses and other signals are transmitted and sensed in such a dynamic, stochastic environment. This session will convene outstanding speakers, who will talk about biomaterials seen from a physics point of view, with specific attention to the structure, the function, and the relationship between structure and function, in both natural biomaterials and synthetic materials inspired by nature.
Buehler and Kats are a theorist and an experimentalist, both are excellent speakers and world leaders in biomaterials. The session will highlight how synthetic biological engineering of cells and molecules can provide research tools for biological physics, to interrogate biological systems at all scales by delivering precise stimuli, obtaining quantitative readouts, performing parameter scans, thereby discovering quantitative principles of biological organization and function.
The universe of bacteria and other microbes that live in concert with their host or environment is often called the microbiome. Interest in the physical properties of microbiome is as old as the field of microbiology itself. Back in the s, Antoine van Leeuwenhoek first discovered that microorganisms living on and in his body, vary a lot in their shape and sizes, suggesting the first hint of a complex microbiome. Recent advances in imaging and sequencing technologies are producing a revolution in the microbiome field.
This revolution presents enormous opportunities for physics and physicists to advance this incredibly exciting field by revealing functional relationships connecting the biogeography and organizational principles of microbiome to the health or wellbeing of its hosts or environment. Intracellular transport describes the continued and dynamic movement of materials in cells. Importantly, dysfunctions in this process are linked to diseases including neurodegeneration. Intracellular transport cannot be accomplished by passive diffusion alone. Instead, cells utilize protein machines molecular motors to actively transport materials along the cytoskeleton.
This Focus Session will bring together experimentalists and theorists working to dissect the physical principles of transport, particularly under complex conditions such as those that occur in cells. Information theory and machine learning methods have been used in science largely for classification purposes. Here we will explore different attempts to use them to predict dynamics of complex often biological systems from data, and to gain physical understanding of the system in the process.
Electric fields are surprisingly ubiquitous in cellular systems from membrane potentials of firing neurons to native electric fields of healing wounds. Many biological techniques controlling cell behavior such as brain stimulation and electroporation utilize electric fields. While the biological processes are very distinct from neuroscience to wound healing, this focus session will concentrate on the unifying physics of cell responses to electric fields from molecular scales to cellular scales, including tissue scale responses to electric fields.
Robots are moving from the factory floor and into our lives autonomous cars, homecare assistants, search and rescue devices, etc. We propose that interaction of researchers studying dynamical systems, soft materials, and living systems can help discover principles that will allow physical robotic devices to interact with the real world in qualitatively different ways than they do now.
And we propose that a Focus session at the APS March meeting that brings together leaders in this emerging area most of whom are not physicists will demonstrate the need for a physics of robotics and reveal interesting problems at the interface of nonlinear dynamics, soft matter, control, and biology. Goldman Georgia Tech, dgoldman3 gatech. It is well known that oscillations and the formation of spatial patterns are intimately connected — for example, similar activator-inhibitor networks can drive both behaviors, and oscillations can drive traveling waves that lead to intricate patterns.
This session will bring together talks describing new research on oscillatory pattern formation in organisms ranging from bacteria to zebrafish. It will thereby introduce March Meeting attendees to some of the latest findings on a variety of important model systems, while also allowing them to see emerging commonalities between the pattern formation mechanisms in these different examples. Recent advances in imaging and sequencing methodologies allow for the first time the visualization and quantification of the events driving embryonic development.
These experimental and theoretical studies are revealing novel physical principles of regulation of biological systems and they will be the focus of the Session. The field of Morphogenesis lies at the intersection between physics, biology and engineering. Many recent activities have focused on understanding how biology has devised elaborated strategies for regulating pattern formation and mechanical forces in both space and time.
Morphogenesis has also inspired scientists to design shape-programmable stimuli-responsive matter. This session aims at bringing together researchers from diverse backgrounds to forge new interdisciplinary connections. This session is designed to showcase recent advances in the application of physical methods and in the formulation of physical principles to understanding brain structure and dynamics.
It will also highlight some of the outstanding problems whose solutions will be advanced by application of physics. We expect that the opportunities explored in this session will stimulate more inputs from physicists to this interdisciplinary field. The dynamics of populations represent an exciting frontier for physicists to understand the emergent structure that results from the interactions of individuals within a population or species within a community.
This focus session will bring together experimental and theoretical approaches to develop a unified understanding of the evolutionary and ecological dynamics of populations. The focus of this session will be on quantifying evolutionary dynamics via state of the art experiments and modeling. The era of sequencing enabled new precision measurements, and now we have abundant data on the evolution of microbes and viruses. These organisms have large population sizes and short generation times, both of which allow us to probe fundamentals of evolutionary biology.
However, many unknowns remain. In the case of pathogens, there are important open questions regarding the evolution of drug resistance. Also, the relationship between rates of genomic evolution and organismal adaptation is at best uncertain. We do not know what sets the size of the genomes, what determines the numbers of genes in genomes, what is the role of horizontal gene transfer on the genome evolution, what determines the temporal dynamics etc. Our goal is to show some of the recent precision measurements and theoretical predictions in evolutionary biology.
Living systems organize in large scale structures and dynamics that are essential to life. Synthetic or bio-inspired active matter emulates similar behavior with model building blocks. This session focuses on the recent progress to understand, control and design self-organization in biology and active matter. It aims at bridging the biophysics and soft matter community and provides a broader scope to our understanding of non-equilibrium systems.
The aim of the symposium is to bring together world-leading experts on structure and reactivity of gas phase clusters and to discuss future directions in this field. The role of gas phase clusters as model systems for related condensed phase systems will be emphasized.
This symposium will bring together experts in the field of molecular magnetism to define current challenges in this field, examine conditions under which their behaviors transform from classical to quantum, and determine how coherent spin effects arise and break down. In addition to possible qubit and quantum-sensor design, talks aimed at rigorous understanding of field-photon- or electron- induced control or interrogation of such systems in chemical, physical and aqueous environs are encouraged as are talks that investigate the role of spin physics in similar naturally occurring functional inorganic molecules.
The aim of the symposium is to bring together world experts on state-of-the-art computational and experimental techniques to discuss i the key role played by the interplay of experiment and theory in spectroscopy gas-phase studies, ii the target accuracy and challenges to be aced by computations when aiming at reproducing and predicting experimental results, and iii future directions to further reduce the gap between theory and experiment.
The accurate simulation of many electronic phenomena in the condensed phase requires tools with predictive power beyond that of DFT. This Focus Session will bring together researchers working on such techniques for systems with explicit periodicity. Represented approaches will include those based on many-electron wavefunctions, Green's functions, quantum Monte Carlo, and embedding formalisms.
Emphasis will be placed on a comparison of the strengths and weaknesses of various methods and collaborative opportunities to advance the field of condensed-phase electronic structure. This symposium will bring together experts working in the field of synthesis, characterization, and modeling of hierarchical systems to discuss recent advances and future research directions. Atomic, molecular, and optical systems offer new settings to explore localization - both in disordered settings with analogs to solid state systems, as well as in novel geometries such as quasiperiodic lattices.
Intriguing transport, entanglement, and many-body effects have been realized as new probes are being constructed. For example, progress in building atomic gas microscopes now allows detailed microscopic studies of localization in time evolution. The control and isolation of AMO systems also make them particularly appealing for exploring concepts surrounding many-body localization, in which there is an interplay between disorder and interactions.
Topological quantum phases of electrons such as quantum Hall states, topological insulators and topological semimetals have been major topics in condensed matter physics with important implications for metrology, low-dissipation electronics, quantum computing and other device applications. By combining mechanical, optical, and atomic elements, one creates systems with novel properties which can be used for answering fundamental questions and developing new technology.
New ideas continue to emerge about coupling systems in ways which make the most of their characteristics such as the long coherence times of photons, or the large coupling matrix elements in mechanical systems. These hybrid systems are becoming useful for metrology, and continue to erode the dividing line between the microscopic and the macroscopic. High precision quantum many-body platforms provide new environments for studying out-of-equilibrium physics. The possibility to control the range of interactions, from short-range for cold atoms to long-range for molecules, Rydberg gases, and trapped ions, allow one for instance to study speed limits on the spread of correlations after a quantum quench.
Because of the combination of long coherence times and highly accurate tools such as quantum gas microscopy available in these systems, non-trivial dynamics can be observed in up to 10th order correlators, and even entanglement can be measured. Integrability and disorder can be tuned and initial state preparation is highly controlled.
Thus one can explore evolution from excited states as well as under periodic driving, allowing access to a range of problems ranging from the dynamics of many-body localized systems to time crystals and other Floquet phenomena. This session will bridge AMO, condensed matter, quantum information, and non-equilibrium statistical mechanics. We now have hundreds of experimental quantum simulators worldwide running on a tremendous variety of architectures including ultracold atoms in optical lattices, Rydberg gases, trapped ions, ultracold molecules, exciton-polariton systems, coupled cavity arrays, and Josephson-Junction-based superconducting nano-electro-mechanical systems.
Such simulators have led to significant advances in our understanding of quantum many-body phases and near-equilibrium phenomena. Beyond work done so far in quantum optics and other contexts, these simulators offer us a new opportunity to address deep unanswered questions in open quantum systems far from equilibrium. At the same time, quantum simulation methods on classical computers, including matrix product density operators and quantum trajectories-based methods, have opened up the opportunity to explore specific dynamical open system models both within and outside the Markov and secular approximations.
They will also allow us to explore new regimes of quantum mechanics, quantum measurement, and quantum technology. The experimental and computational study of quantum systems consisting of a relatively small number of particles enjoys a renewed interest in the broad community thanks to the recent theoretical and experimental developments in achieving unprecedented accuracy for few-particle systems. A complete understanding of all these subtle effects makes it necessary to massively go beyond the common approximations used to describe atoms and molecules and opens up directions for building new physical theories even beyond the Standard Model.
The purpose of this focus session is to survey recent activity in the field that is related to the following areas: Precision spectroscopy of small atoms and molecules; Molecular quantum mechanics beyond the Born—Oppenheimer approximation; Non-adiabatic models for molecular systems; Relativistic and quantum electrodynamics computations for molecules; High-level quantum chemistry methods e.
There has been explosive growth in the study of topological insulators in which the combined effects of the spin-orbit coupling and time-reversal symmetry yield a bulk energy gap with novel gapless surface states that are robust against scattering. Moreover, the field has expanded in scope to include topological phases more complex materials such as Kondo systems, magnetic materials, and complex heterostructures capable of harboring exotic topologically nontrivial state of quantum matter. The observation of theoretical predictions depends greatly on sample quality and there remain significant challenges in identifying and synthesizing the underlying materials that have properties amenable to the study of the bulk, surface and interface states of interest.
This topic will focus on fundamental advances in the synthesis, characterization and modeling of candidate topological materials in various forms including single crystals, exfoliated and epitaxial thin films and heterostructures, and nanowires and nanoribbons, in addition to theoretical studies that illuminate the synthesis effort and identify new candidate materials.
Organizers: Lu Li University of Michigan, luli umich. The field of topological semimetals has developed dramatically over the past few years. After the initial prediction and discovery of Dirac and Weyl semimetals — materials whose low energy excitations can be described by the Dirac or Weyl equation of high-energy physics — the field has now expanded to include new low-energy excitations not possible in a high-energy setting. Semimetals with different degeneracy at crossing points or lines have been predicted. Transport theories and effects have been predicted and proposed in order to measure a small subset of the topological characteristics of the semimetals such as Chern numbers.
Furthermore, semimetals whose existence is guaranteed by filling constraints derived from the presence of certain orbitals at certain points in specific lattices have also been mentioned in the literature. Distinct from conventional low carrier density systems, Dirac, Weyl and other semimetals are expected to possess exotic properties due to the nontrivial topologies of their electronic wave functions. A subset of the novel properties predicted include Berry phase contributions to transport properties, chiral anomaly, quantized nonlinear transport under circularly polarized light, protected Fermi arc surface states, suppressed scattering, optical control of topology, landau level spectroscopy, superconductivity, and non-local transport.
While promising candidate materials exist for many but certainly not all of the topological semimetals, many phenomena have yet to be clearly resolved. This focus topic aims to explore Dirac, Weyl and other new semimetals and the novel phenomena associated with them. We solicit contributions on predictions, new materials synthesis and characterization, new phenomena in topological semimetals, as well as studies on both conventional and unconventional semimetals, both in the bulk and on the surfaces of samples that accentuate the non-trivial topological character of the new semimetals.
Organizers: Dmytro Pesin University of Utah, d. Topological superconductors are superconductors characterized by topological invariants associated with the band structure of the Bogoliubov quasiparticles. They have been a focus of significant experimental and theoretical efforts in view of their relevance to fundamental physical and mathematical concepts, and potential for quantum computation. Along with the search for bulk materials candidates, there has been much recent progress in studies of atomically thin films, artificially engineered structures, and the surfaces of bulk materials.
This Focus Topic will cover topological superconductivity and the closely related non-centrosymmetric superconductivity in new experimental settings involving transition metal dichalcogenides, topological insulators, Weyl semi-metals, FeSe-based systems, graphene, engineered heterostructures, semiconducting nanowires, atomic chains and Shiba states, junctions with ferromagnets, quantum Hall states, and driven systems and Floquet states.
This Focus Topic will also cover the new understanding of bulk materials candidates such as Sr2RuO4 and the emerging opportunities in platforms such as twisted bilayers of 2D materials, and advances in strategies for quantum information processing using topological superconductivity. Organizers: Arun Bansil Northeastern University, ar. Impurities and native defects profoundly affect the electronic and optical properties of semiconductor materials. Impurity incorporation is often a necessary step for tuning the electrical properties in semiconductors. Defects control carrier concentration, mobility, lifetime, and recombination; they are also responsible for the mass-transport processes involved in the migration, diffusion, and precipitation of impurities and host atoms.
Controlling the presence of impurities and defects is a critical factor in semiconductor engineering, and has enabled the remarkable development of Si-based electronics, GaN based blue light-emitting diodes and lasers, semiconducting oxides for transparent conducting displays, and the promise of next-generation sensors and computing based on defects like the NV center in diamond.
The fundamental understanding, characterization and control of defects and impurities will also be essential for developing new devices, such as those based on novel wide-band gap semiconductors, spintronic materials, and low dimensional structures. The physics of dopants and defects in semiconductors, from the bulk to the nanoscale and including surfaces and interfaces, is the subject of this focus topic. Abstracts on experimental, computational and theoretical investigations are solicited in areas of interest that include: the electronic, structural, optical, and magnetic properties of impurities and defects in elemental and compound semiconductors; wide band-gap materials such as diamond, aluminum nitride, and gallium oxide; single-photon emitters including NV centers and their analogues; defects in two-dimensional materials including phosphorene, h-BN, transition metal dichalcogenides, 2D ferromagnets, and MXenes; and the emerging organic-inorganic hybrid perovskite solar cell materials are of interest.
Abstracts on specific materials challenges involving defects, e. Organizers: Cyrus Dreyer Rutgers University, cedreyer physics. Complex oxides can exhibit a rich variety of order parameters, such as polarization, strain, charge and orbital magnetization degrees of freedom. Their ordering phenomena give rise to a vast range of functional properties including ferroelectricity, polarity, pyroelectricity, electrocaloricity, magnetoelectricity, multiferroicity, metal-insulator transitions and defect- related properties, which are the principal topics of interest for this symposium.
Subtotal Elective Credits Required. Curriculum Summary. Total number of courses required for the degree. Total credit hours required for degree. Prerequisite, Concentration or Other Requirements:. Advanced Mechanics of Fluids.
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Advanced Structural Analysis. Advanced Analysis and Design of Reinforced Concrete. Fiber Reinforced Polymer Materials. Mechanics of Fibrous Structures. Convective Heat Transfer. Computational Fluid Mechanics. Methods of Experimental Research. Bioengineering Fundamentals. Statistical Thermodynamics. Prestressed Concrete Analysis and Design. Matrix Methods of Structural Analysis. Design of Structural Systems. Open Channel Flow Hydraulics. Advanced Processes in Environmental Engineering. GeoEnvironmental Engineering. Tackling 21st-century problems: The College of Engineering is preparing a new generation of students for a lifetime of impact in every field.
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Research Ethics. Doctoral Seminar. Prerequisite, Concentration or Other Requirements: Ph. MNE