Article
Chemistry, Multidisciplinary
Ke Liu, Phanisri P. Pratapa, Diego Misseroni, Tomohiro Tachi, Glaucio H. Paulino
Summary: This research explores the geometrical-frustration-induced anisotropy and inhomogeneity to achieve unique properties of metamaterials. Using a triclinic metamaterial system based on a Trimorph origami pattern, a folding motion is created that results in an unusual Poisson effect and reversible auxeticity. Tessellating tristable unit cells produces phenomena resembling linear and point defects due to geometric frustration. This frustration can be reprogrammed into distinct stable and inhomogeneous states by selecting the location of point defects. These findings have potential applications in wave propagation control and compliant microrobots.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Lei Wang, Zhongwen Ouyang, Tongtong Xiao, Zhengrong Li, Zhaoming Tian
Summary: We present the synthesis, structure, and magnetic properties of a previously unexplored family of rare-earth based RTa7O19 compounds. Structural analysis reveals that magnetic R ions form ideal two-dimensional triangular lattice layers in the ab-plane, separated by nonmagnetic polyhedra layers along the c-axis. Magnetic susceptibility and magnetization measurements demonstrate the absence of long-range magnetic order and field-induced magnetic transitions in all studied compounds. The details of the magnetism strongly depend on the type of R ions. The presence of geometrical frustration is discussed. Thus, RTa7O19 offers a new platform for exploring frustrated magnetism.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Anton Molina, Shailabh Kumar, Stefan Karpitschka, Manu Prakash
Summary: Geometry in materials plays a crucial role in determining material behavior, influencing the study of interacting many-body dynamics. An experimental system utilizing multidroplet evaporation physics under two-dimensional spatial constraints reveals frustrated, metastable states with relaxation on two timescales. This platform offers a means to directly visualize dynamics of complex many-body systems interacting via long-range interactions, providing a flexible and cost-effective approach for rapid exploration in the design space between geometry and interactions.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Physics, Multidisciplinary
Carolina Rodriguez-Gallo, Antonio Ortiz-Ambriz, Cristiano Nisoli, Pietro Tierno
Summary: In this study, we investigate the low energy states and the emergence of topological defects in an artificial colloidal ice in the Cairo geometry using experiments and numerical simulations. By increasing the interaction strength, positive charges accumulate at the z = 4 vertices and are screened by negative charges at the z = 3 vertices, resulting in a strongly coupled disordered state. Furthermore, analyzing the mean chirality associated with each pentagonal plaquette reveals that the disordered ensemble in this geometry is massively degenerate and corresponds to a frustrated antiferrotoroid structure.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Joseph Pollard, Gareth P. Alexander
Summary: This article gives a description of the intrinsic geometry of elastic distortions in three-dimensional nematic liquid crystals and establishes necessary and sufficient conditions for a set of functions to represent these distortions by describing how they couple to the curvature tensor. It is shown that, unlike in two dimensions, the first-order gradients of the director alone are not sufficient for full reconstruction of the director field from its intrinsic geometry and additional information about the second-order director gradients is necessary. Furthermore, various methods for reconstructing the director field from its intrinsic geometry are described, and the coupling between individual distortions and curvature is discussed from the perspective of Lie algebras and groups, along with the description of homogeneous spaces where pure modes of distortion can be realized.
NEW JOURNAL OF PHYSICS
(2021)
Article
Chemistry, Physical
Cheng Long, Jonathan V. Selinger
Summary: Many materials exhibit geometric frustration due to the compromise between ideal local structure and geometric constraints. This paper investigates the structures formed by chiral liquid crystals under different spatial constraints, and analyzes the relative free energies using theory and simulations.
Article
Multidisciplinary Sciences
Darui Xu, Stephen Lyon, Chun Hui Bu, Sara Hildebrand, Jin Huk Choi, Xue Zhong, Aijie Liu, Emre E. Turer, Zhao Zhang, Jamie Russell, Sara Ludwig, Elena Mahrt, Evan Nair-Gill, Hexin Shi, Ying Wang, Duanwu Zhang, Tao Yue, Kuan-wen Wang, Jeffrey A. SoRelle, Lijing Su, Takuma Misawa, William McAlpine, Lei Sun, Jianhui Wang, Xiaoming Zhan, Mihwa Choi, Roxana Farokhnia, Andrew Sakla, Sara Schneider, Hannah Coco, Gabrielle Coolbaugh, Braden Hayse, Sara Mazal, Dawson Medler, Brandon Nguyen, Edward Rodriguez, Andrew Wadley, Miao Tang, Xiaohong Li, Priscilla Anderton, Katie Keller, Amanda Press, Lindsay Scott, Jiexia Quan, Sydney Cooper, Tiffany Collie, Baifang Qin, Jennifer Cardin, Rochelle Simpson, Meron Tadesse, Qihua Sun, Carol A. Wise, Jonathan J. Rios, Eva Marie Y. Moresco, Bruce Beutler
Summary: The study uses machine-learning software called Candidate Explorer (CE) to identify mutations causing immune phenotypes in mice and has found that over half of the genes may be responsible for this variation. Many of these genes were not previously known to be related to immune function or homeostasis.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Physics, Multidisciplinary
Nancy Makri
Summary: This paper investigates conical intersections in cyclic tight-binding system-bath Hamiltonians. It is found that under weak system-bath coupling, overlapping wavefunctions associated with different sites lead to slower transfer dynamics due to interfering geometric phases. The effect is most pronounced in the presence of low-temperature dissipative baths characterized by a continuous spectral density. The transfer dynamics and equilibration time of a cyclic dissipative three-site system with a positive coupling exceeds that of similar systems with a negative coupling, as well as that of cyclic four-site systems, by an order of magnitude.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Materials Science, Multidisciplinary
Janav P. Udani, Andres F. Arrieta
Summary: This study reports on a continuum system with locally bistable units that can exhibit controlled and self-sustained macroscopic geometric frustration. The system's patterning encodes ordered ground configurations and higher-order frustrated states, which can be activated by unit inversion and accessed through controlling the inversion sequence. The study presents a strategy for observing the unfolding of geometric frustration and offers potential applications in path-driven computation and optimization using structural systems.
MATERIALS & DESIGN
(2022)
News Item
Physics, Multidisciplinary
David Bernal Neira
Summary: Using quantum annealer for simulating phase transition dynamics is a crucial step towards quantum simulation and optimization, showcasing the capability of superconducting quantum devices in handling large-scale systems.
Article
Optics
Zejian Li, Ariane Soret, Cristiano Ciuti
Summary: The study introduces a photonic quantum simulator for antiferromagnetic spin systems based on reservoir engineering, which allows for simulating antiferromagnetism and frustration on a controlled quantum optical platform. By indirectly coupling quadratically driven dissipative Kerr cavities via lossy ancillary cavities, an effective dissipative and Hamiltonian antiferromagneticlike coupling between the cavities is achieved. The non-equilibrium steady state of the system shows similarities with the ground state of an antiferromagnetic Ising model, indicating key features of frustration.
Article
Multidisciplinary Sciences
Geva Arwas, Sagie Gadasi, Igor Gershenzon, Asher Friesem, Nir Davidson, Oren Raz
Summary: Non-Hermitian Hamiltonians, such as parity-time (PT) and anti-PT symmetric Hamiltonians, have significant implications in various branches of physics. In this study, we investigate these novel symmetries theoretically and demonstrate them experimentally in coupled laser systems. We also discover a new relation between laser synchronization and the symmetry of the underlying non-Hermitian Hamiltonian.
Article
Physics, Multidisciplinary
Isaac R. Spivack, Douglas M. Hall, Gregory M. Grason
Summary: Geometrically frustrated assembly is an attractive paradigm for understanding and engineering assemblies with self-limiting dimensions. This study proposes and investigates a novel 2D particle based on a warped jigsaw shape design, and explores how intra-assembly stress gradients emerge from microscopic properties of the particles. The study also demonstrates the control of assembly size through the design of particles.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Vineeth Mohanan Parakkat, Gavin M. Macauley, Robert L. Stamps, Kannan M. Krishnan
Summary: This research demonstrates the tunability of the ground state for a hybrid artificial spin ice made of Fe nanomagnets, with three distinct magnetic textures identified by varying site-specific exchange-bias fields: a striped ferromagnetic phase, an antiferromagnetic phase achievable through external field protocols, and an unconventional ground state with magnetically charged pairs embedded in an antiferromagnetic matrix. Monte Carlo simulations support the results of field protocols and show that pinning tunes relaxation timescales and critical behavior.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Kenta Takata, Kengo Nozaki, Eiichi Kuramochi, Shinji Matsuo, Koji Takeda, Takuro Fujii, Shota Kita, Akihiko Shinya, Masaya Notomi
Summary: This study presents the first non-Hermitian nanophotonic platform, demonstrating spontaneous emission at exceptional points (EPs) through systematic tuning and independent current injection, revealing a clear EP phase transition and unique spectral features.
Article
Optics
Vishwa Pal, Chene Tradonsky, Ronen Chriki, Natan Kaplan, Alexander Brodsky, Mickael Attia, Nir Davidson, Asher A. Friesem
Article
Optics
Ronen Chriki, Gilad Barach, Chene Tradosnky, Slava Smartsev, Vishwa Pal, Asher A. Friesem, Nir Davidson
Article
Optics
Ronen Chriki, Elhanan Maguid, Chene Tradonsky, Vladimir Kleiner, Asher A. Friesem, Nir Davidson, Erez Hasman
Article
Nanoscience & Nanotechnology
Elhanan Maguid, Ronen Chriki, Michael Yannai, Vladimir Kleiner, Erez Hasman, Asher A. Friesem, Nir Davidson
Article
Multidisciplinary Sciences
C. Tradonsky, I. Gershenzon, V. Pal, R. Chriki, A. A. Friesem, O. Raz, N. Davidson
Article
Physics, Multidisciplinary
Simon Mahler, Matthew L. Goh, Chene Tradonsky, Asher A. Friesem, Nir Davidson
PHYSICAL REVIEW LETTERS
(2020)
Article
Optics
Marco Piccardo, Vincent Ginis, Andrew Forbes, Simon Mahler, Asher A. Friesem, Nir Davidson, Haoran Ren, Ahmed H. Dorrah, Federico Capasso, Firehun T. Dullo, Balpreet S. Ahluwalia, Antonio Ambrosio, Sylvain Gigan, Nicolas Treps, Markus Hiekkamaki, Robert Fickler, Michael Kues, David Moss, Roberto Morandotti, Johann Riemensberger, Tobias J. Kippenberg, Jerome Faist, Giacomo Scalari, Nathalie Picque, Theodor W. Haensch, Giulio Cerullo, Cristian Manzoni, Luigi A. Lugiato, Massimo Brambilla, Lorenzo Columbo, Alessandra Gatti, Franco Prati, Abbas Shiri, Ayman F. Abouraddy, Andrea Alu, Emanuele Galiffi, J. B. Pendry, Paloma A. Huidobro
Summary: Our ability to manipulate light patterns by combining different electromagnetic modes has significantly improved in recent years. This concept of structured light is being applied across various fields of optics, enabling the generation of classical and quantum states of light, utilization of linear and nonlinear light-matter interactions, and advancements in microscopy, spectroscopy, holography, communication, and synchronization. This Roadmap provides an overview of these areas, their current research, and future developments, emphasizing the power of multimodal light manipulation to inspire new approaches in this vibrant research community.
Article
Physics, Multidisciplinary
Yaniv Eliezer, Simon Mahler, Asher A. Friesem, Hui Cao, Nir Davidson
Summary: This article presents a method for controlling laser mode structures by introducing random phase fluctuation, which has advantages such as wide tunability, strong flexibility, and robustness, and can be used to investigate many-body phenomena.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Geva Arwas, Sagie Gadasi, Igor Gershenzon, Asher Friesem, Nir Davidson, Oren Raz
Summary: Non-Hermitian Hamiltonians, such as parity-time (PT) and anti-PT symmetric Hamiltonians, have significant implications in various branches of physics. In this study, we investigate these novel symmetries theoretically and demonstrate them experimentally in coupled laser systems. We also discover a new relation between laser synchronization and the symmetry of the underlying non-Hermitian Hamiltonian.
Article
Optics
Ronen Chriki, Simon Mahler, Chene Tradonsky, Asher A. Friesem, Nir Davidson
Summary: This study introduces an ultrafast all-optical imaging method that utilizes a highly multimode self-imaging laser cavity to minimize scattering effects and can handle fast dynamics on short timescales.
Article
Physics, Multidisciplinary
Simon Mahler, Asher A. Friesem, Nir Davidson
PHYSICAL REVIEW RESEARCH
(2020)
Article
Optics
Simon Mahler, Chene Tradonsky, Ronen Chriki, Asher A. Friesem, Nir Davidson
Article
Optics
Ronen Chriki, Simon Mahler, Chene Tradonsky, Vishwa Pal, Asher A. Friesem, Nir Davidson
Proceedings Paper
Engineering, Electrical & Electronic
Chene Tradonsky, Ronen Chriki, Vishwa Pal, Gilad Barach, Asher A. Friesem, Nir Davidson
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Ronen Chriki, Slava Smartsev, Gilad Barach, Chene Tradonsky, Vishwa Pal, Asher A. Friesem, Nir Davidson
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2017)