Article
Multidisciplinary Sciences
Maayan Fox, Yuri Gorodetski
Summary: We experimentally demonstrated the excitation of surface plasmons using diffraction from gratings with randomized periodicity. The plasmonic excitation is conditioned by a combination of geometric and dynamic phases, allowing for precise interaction between the incident light signal and a specific plasmonic mode in a polarization-dependent manner.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
Seou Choi, Jungmin Kim, Jeonghun Kwak, Namkyoo Park, Sunkyu Yu
Summary: A building block is proposed for all-optical transition between topologically protected memory states, enabling the design of all-optical in-memory processors with stable memory states.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Acoustics
Xiang Liu, Guoping Cai, K. W. Wang
Summary: This paper investigates topologically protected wave propagation in metastable structure by mimicking the quantum valley Hall effect, achieving reconfigurable topological waveguides. Through breaking the space inversion symmetry of the unit cell and opening a topological bandgap, the non-triviality of the bandgap is verified using Berry curvature and valley Chern number. Utilizing edge modes, topologically protected waveguides immune to backscattering at sharp corners and local defects are achieved.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Physics, Multidisciplinary
Kai Li, Jiong-Hao Wang, Yan-Bin Yang, Yong Xu
Summary: Recent theoretical studies suggest that structural disorder can induce a topological insulator from a crystalline material, but experimental observation is challenging. With the experimentally realized randomly positioned Rydberg atoms, studying structural disorder induced topological phase transitions becomes feasible. The research reveals symmetry-protected topological amorphous insulators and structural disorder induced topological phase transition at a single-particle level in an experimentally accessible system.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Tian-Shu Deng, Lei Pan, Yu Chen, Hui Zhai
Summary: This study investigates the stability of Kramers degeneracy and nontrivial topological states under time-reversal symmetry against coupling to the environment. The results show that dissipation can lead to splitting of spectral functions for degenerate states and induce backscattering between counterpropagating edge states, causing the absence of accurate quantization of conductance in the case of the quantum spin Hall effect. The findings have implications for interacting topological phases protected by time-reversal symmetry.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Tian-Shu Deng, Lei Pan
Summary: Symmetry protected quantum systems exhibit differences in coherence preservation between antiunitary and unitary symmetries. A classification table illustrates what kinds of symmetry combinations are able to preserve the coherence of the initial state, providing insights for achieving stable time-reversal symmetric topological states. This research can also be applied to interacting topological systems such as the Haldane phase.
Article
Optics
X. Z. Hao, X. Y. Zhang, Y. H. Zhou, C. M. Dai, S. C. Hou, X. X. Yi
Summary: We investigate the optomechanically induced transparency (OMIT) in an optomechanical lattice and discover the response variation of the system in different topological phases. This study is significant for the generalization of OMIT phenomenon in topological optomechanical systems.
Article
Nanoscience & Nanotechnology
Sunkyu Yu, Xianji Piao, Namkyoo Park
Summary: A study has revealed a different class of topological states in non-Hermitian and nonlinear optical dynamics, known as the topological geometry of dynamical state trajectories, which exhibit topologically protected oscillation quenching mechanisms determined by parity-time symmetry.
Article
Multidisciplinary Sciences
Louis Ponet, S. Artyukhin, Th. Kain, J. Wettstein, Anna Pimenov, A. Shuvaev, X. Wang, S. -w. Cheong, Maxim Mostovoy, Andrei Pimenov
Summary: This study demonstrates a method to reverse the electric polarization of multiferroic materials by applying and removing a magnetic field, which requires two cycles to bring the system back to its original configuration. During this process, the system visits four states with different magnetic configurations, with half of the spins undergoing unidirectional full-circle rotation in increments of about 90 degrees. Therefore, this material exhibits a peculiar magnetoelectric switching behavior that converts the variations of the magnetic field into circular spin motion.
Article
Physics, Multidisciplinary
Abhishodh Prakash, Juven Wang
Summary: It has been proven that the boundaries of all nontrivial (1 + 1)-dimensional intrinsically fermionic symmetry-protected-topological phases, protected by finite on-site symmetries (unitary or antiunitary), are supersymmetric quantum mechanical systems. This supersymmetry arises as a consequence of the boundary 't Hooft anomaly that classifies the phase, and is distinct from other well-known degeneracies such as Kramers doublets.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Shang-Qiang Ning, Chenjie Wang, Qing-Rui Wang, Zheng-Cheng Gu
Summary: In this study, the Abelian Chern-Simons theory was used to analyze fermionic SPT phases protected by arbitrary Abelian total symmetry G(f). Compared to bosonic SPT phases, these fermionic phases exhibit new features such as support for gapless Majorana fermion edge modes and the effect of nontrivial symmetry extensions on bosonic SPT phases. This research also sheds light on the realization of intrinsic fSPT phases in interacting fermionic systems.
Article
Optics
Ji Cao, Wen-Xue Cui, X. X. Yi, Hong-Fu Wang
Summary: The proposed scheme achieves periodically modulated Su-Schrieffer-Heeger model with a one-dimensional optomechanical lattice. It demonstrates two topologically distinct phases, realizes photon-phonon conversion, and investigates the robustness of the system against on-site defect potentials. Interestingly, adding a large defect to edge sites can induce additional quantum channels for photon-photon and phonon-phonon transfers.
Article
Physics, Multidisciplinary
Helene Spring, Anton Akhmerov, Daniel Varjas
Summary: In amorphous topological materials, protection of topological surface states is improved due to continuous rotation symmetry, resulting in critical scaling of transport and protection of edge from localization in the topological phase.
Article
Materials Science, Multidisciplinary
Kartiek Agarwal
Summary: This paper investigates the possibility of realizing non-Abelian zero modes along line defects in certain fractional quantum Hall states. By imposing a hybrid structure involving a superlattice on the multivalley quantum Hall surface, non-Abelian anyons can be achieved and the line defects can be moved through strain modulation. The relevant gapping perturbations are identified using a K-matrix approach, and a scheme using strain modulation is provided to braid these modes.
Article
Optics
Julien Pinske, Stefan Scheel
Summary: This article investigates the generation of non-Abelian geometric phases from a system of evanescently coupled waveguides using nonorthogonal coupled-mode theory. A feasible tripod arrangement of waveguides is studied, which contains dark states that can undergo nontrivial U(2) mixing through an adiabatic parameter variation. The influence of higher-order contributions and self-coupling on the stability of a non-Abelian U(3) phase generated from an optical tetrapod setup is also examined. The results indicate that, despite the mode nonorthogonality, the symmetry of dark states protects the geometric evolution of light from distortion.
Article
Physics, Multidisciplinary
Gregory Bentsen, Ionut-Dragos Potirniche, Vir B. Bulchandani, Thomas Scaffidi, Xiangyu Cao, Xiao-Liang Qi, Monika Schleier-Smith, Ehud Altman
Article
Multidisciplinary Sciences
Chenguang Fu, Satya N. Guin, Thomas Scaffidi, Yan Sun, Rana Saha, Sarah J. Watzman, Abhay K. Srivastava, Guowei Li, Walter Schnelle, Stuart S. P. Parkin, Claudia Felser, Johannes Gooth
Article
Physics, Multidisciplinary
Maja D. Bachmann, Aaron L. Sharpe, Graham Baker, Arthur W. Barnard, Carsten Putzke, Thomas Scaffidi, Nabhanila Nandi, Philippa H. McGuinness, Elina Zhakina, Michal Moravec, Seunghyun Khim, Markus Konig, David Goldhaber-Gordon, Douglas A. Bonn, Andrew P. Mackenzie, Philip J. W. Moll
Summary: In a finite crystal, the shape of the crystal breaks the point-group symmetry, leading to changes in the material properties. Experimental results show that the strongly facetted Fermi surface and long quasiparticle mean free path in microstructures of PdCoO2 result in an in-plane resistivity anisotropy, which is forbidden by symmetry on an infinite hexagonal lattice. The direction of the narrow channel is identified as the source of symmetry breaking.
Article
Multidisciplinary Sciences
Fabian Jerzembeck, Henrik S. Roising, Alexander Steppke, Helge Rosner, Dmitry A. Sokolov, Naoki Kikugawa, Thomas Scaffidi, Steven H. Simon, Andrew P. Mackenzie, Clifford W. Hicks
Summary: Applying in-plane uniaxial pressure can dramatically change the electronic structure of strongly correlated low-dimensional systems, and using pressure along the c axis can provide even stronger control over the quasi-two-dimensional structure. In the superconductor Sr2RuO4, in-plane strain enhances Tc and Hc2, but the effect of out-of-plane strain has not been studied.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
C. Kumar, J. Birkbeck, J. A. Sulpizio, D. Perello, T. Taniguchi, K. Watanabe, O. Reuven, T. Scaffidi, Ady Stern, A. K. Geim, S. Ilani
Summary: Recent research has shown that hydrodynamic electronic phenomena can transcend the fundamental limitations of ballistic electrons, with important implications for fundamental science and future technologies. High-mobility graphene Corbino disk devices were used to image single-electron-transistor electronic flow, revealing the elimination of bulk Landauer-Sharvin resistance by electron hydrodynamics. This study highlights the potential of electronic fluids to revolutionize electronic conduction.
Article
Physics, Multidisciplinary
Ady Stern, Thomas Scaffidi, Oren Reuven, Chandan Kumar, John Birkbeck, Shahal Ilani
Summary: Recent research has shown that by choosing the proper device geometry, it is possible to eliminate Landauer-Sharvin resistance in an electronic system through electron hydrodynamics. The dynamics of electrons flowing in channels terminating within the sample play a crucial role in this effect. Contrary to ohmic electrons, the resistance of hydrodynamic electrons can decrease with the length of a device with a given width.
PHYSICAL REVIEW LETTERS
(2022)
Correction
Materials Science, Multidisciplinary
Maxime Dupont, Snir Gazit, Thomas Scaffidi
Article
Materials Science, Multidisciplinary
Thomas Scaffidi
Summary: Based on a weak coupling calculation, it is shown that accidental degeneracy occurs between even- and odd-parity superconductivity in the quasi-one-dimensional (1D) limit of the repulsive Hubbard model on the square lattice. It is proposed that this effect may be relevant to the quasi-1D orbitals Ru dzx and dzy of Sr2RuO4, resulting in a gap of the form Aeven + iAodd, which could help reconcile several experimental results.
Article
Materials Science, Multidisciplinary
Jack H. Farrell, Nicolas Grisouard, Thomas Scaffidi
Summary: In this study, we investigate the radial flow in a Corbino disk and find that this geometry significantly enhances the Dyakonov-Shur (DS) instability, leading to higher generated power. This is directly relevant to current efforts to detect the experimentally elusive phenomenon of hydrodynamic electron flows.
Article
Materials Science, Multidisciplinary
Maxime Dupont, Snir Gazit, Thomas Scaffidi
Summary: Using quantum Monte Carlo simulations, we mapped out the phase diagram of Hamiltonians transitioning between trivial and nontrivial bosonic symmetry-protected topological phases, finding an intermediate phase where the protecting symmetry is spontaneously broken. Various magnetic orders on the triangular lattice were identified, and critical properties were determined through finite-size scaling analysis, with possible scenarios regarding the nature of phase transitions discussed.
Article
Physics, Multidisciplinary
Arijit Haldar, Omid Tavakol, Thomas Scaffidi
Summary: In the context of q-local Hamiltonians, simple variational states can have energy a finite fraction of the ground-state energy, with product states being more successful in bosonic models than Gaussian states in fermionic cases like the Sachdev-Ye-Kitaev (SYK) model. A new class of wave functions inspired by the variational coupled cluster algorithm is proposed for SYK models, with a study focusing on energy, two-point correlators, and entanglement properties using a static (0+0)-dimensional large-N field theory. Importantly, a finite disorder-averaged approximation ratio between variational and ground-state energy is demonstrated for the SYK model with q = 4, and variational states accurately describe spontaneous symmetry breaking in a related two-flavor SYK model.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Optics
Xiangyu Cao, Thomas Scaffidi
Summary: Recent research has shown that scrambled information can be partially recovered through time-reversed evolution even after being damaged by an intruder. The presence of classical chaos does not completely prevent information recovery, but rather leads to a reduction in the recovery ratio. Furthermore, decoherence (i.e., entanglement with the intruder) limits the recovery process, with an upper bound on the recovery ratio determined by the entangling power of the intruder's actions.
Article
Materials Science, Multidisciplinary
Tobias Holder, Raquel Queiroz, Thomas Scaffidi, Navot Silberstein, Asaf Rozen, Joseph A. Sulpizio, Lior Ella, Shahal Ilani, Ady Stern
Article
Physics, Multidisciplinary
Henrik S. Roising, Thomas Scaffidi, Felix Flicker, Gunnar F. Lange, Steven H. Simon
PHYSICAL REVIEW RESEARCH
(2019)
Article
Materials Science, Multidisciplinary
Thomas Scaffidi, Ehud Altman