Article
Multidisciplinary Sciences
Qingqing Cheng, Huaiqiang Wang, Yongguan Ke, Tao Chen, Ye Yu, Yuri S. Kivshar, Chaohong Lee, Yiming Pan
Summary: This study reveals an unexpected phenomenon in topological pumping observed in arrays of nonparaxial optical waveguides and demonstrates an asymmetric topological pumping process. This finding could open avenues for the development of nonparaxial topological photonics.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Condensed Matter
A. A. Povzner, A. G. Volkov, S. A. Bessonov
Summary: A thermodynamic fluctuation phase arising in the semi-metallic compound CoSi is considered. It is shown that a negative intermode coupling in a system of strongly correlated d electrons leads to thermodynamic instability and density fluctuations in the Weyl semi-metal. In the presence of an external magnetic field, the spin system undergoes magnetization in the opposite direction accompanied by an increase in entropy. With decreasing temperature, the intermode coupling disappears and there is a topological electronic transition into the Weyl semi-metallic phase.
SOLID STATE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Jacqueline Bloch, Andrea Cavalleri, Victor Galitski, Mohammad Hafezi, Angel Rubio
Summary: A goal of modern condensed-matter physics is to search for states of matter with emergent properties and desirable functionalities. By controlling light-matter interactions, it is possible to manipulate and synthesize strongly correlated quantum matter, leading to phenomena like photon-mediated superconductivity, cavity fractional quantum Hall physics, and optically driven topological phenomena.
Article
Physics, Multidisciplinary
Ryan Requist, E. K. U. Gross
Summary: The study focuses on factorizing a many-body wave function in Fock space, describing strongly correlated orbitals and weakly correlated parts separately. By using a generalized Kohn-Sham equation with an orbital-dependent functional approximation, the researchers were able to reproduce the topological phase diagram of a multiband Hubbard model. The roles of band filling and interband fluctuations were also elucidated in the study.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
D. Burba, M. Raciunas, I. B. Spielman, G. Juzeliunas
Summary: Recent experiments have shown the realization of deeply subwavelength lattices using atoms with multiple internal states coupled with lasers. These lattices have smaller unit cells compared to traditional optical lattices, and detuning from resonance induces tunneling between the potentials. By modulating the detuning, coupled subwavelength Rice-Mele chains can be created, which operate as a topological charge pump. This behavior is described analytically using infinite-system Chern numbers and numerically identified finite-system edge states.
Article
Materials Science, Multidisciplinary
F. Manghi
Summary: The study investigates the effects of electron-electron interaction in a three-dimensional crystalline topological insulator by adding on-site repulsion to the single-particle Hamiltonian. The researchers demonstrate that tuning the strength of the on-site interaction leads to the disappearance of band inversion in the bulk and the loss of metallic character in surface states.
Article
Chemistry, Multidisciplinary
M. Grzeszczyk, S. Acharya, D. Pashov, Z. Chen, K. Vaklinova, M. van Schilfgaarde, K. Watanabe, T. Taniguchi, K. S. Novoselov, M. I. Katsnelson, M. Koperski
Summary: It is discovered that despite similar structural and magnetic configurations, the coupling between excitons and magnetization is qualitatively different in CrBr3 and CrI3 films. Through a combination of optical spin pumping experiments and state-of-the-art theory, it is concluded that the hole-magnetization coupling has the opposite sign in CrBr3 and CrI3, as well as between the ground and excited exciton state. Efficient spin pumping capabilities are demonstrated in CrBr3 driven by magnetization via spin-dependent absorption, and the different origins of the magnetic hysteresis in CrBr3 and CrI3 are unraveled.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Giacomo Mazza, Adriano Amaricci
Summary: This study investigates the effects of strongly correlated electrons on the excitonic properties in gate-controlled heterostructures. The results show that exciton-polarons can serve as a direct signature of correlation-driven insulators formation.
Article
Physics, Multidisciplinary
Wenjie Liu, Shi Hu, Li Zhang, Yongguan Ke, Chaohong Lee
Summary: This study explores how particle-particle interactions affect topological transport in a periodically modulated and tilted optical lattice. Three characterized interaction effects are revealed: topological pumping of bound states, interaction blockade of scattering states, and topologically resonant tunnelings. This research deepens the understanding of correlation effects on topological states and provides a feasible way for detecting topological properties in interacting systems.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Arnab Chakrabarti, Rangeet Bhattacharyya
Summary: In this work, we theoretically demonstrate that prethermal phases can arise in a dipolar two-spin-1/2 system coupled to a heat bath when considering the cross terms between the drive and dipolar interactions. Using the fluctuation-regulated quantum master equation, we show that the predicted dynamics can explain the experimentally observed features of the transient and prethermal regime.
Article
Physics, Applied
Sheng-Xuan Xia, Di Zhang, Xiang Zhai, Ling-Ling Wang, Shuang-Chun Wen
Summary: In this Letter, the authors report on phase-controlled topological plasmons in 1D graphene nanoribbons based on a variant of the Su-Schrieffer-Heeger (SSH) model. They investigate the normal SSH model and reveal the existence of edge modes with nontrivial topology, which exhibit strong field confinement and extreme frequency stability. The authors also introduce an offset SSH model variant that allows for engineering the width of the topological gap and the number of topological windows. The findings provide insight into the physics of topologically protected graphene plasmons and offer potential applications in designing plasmon devices with immunity to structural imperfections.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Cheng Shen, Patrick J. Ledwith, Kenji Watanabe, Takashi Taniguchi, Eslam Khalaf, Ashvin Vishwanath, Dmitri K. Efetov
Summary: Magic-angle twisted trilayer graphene (MATTG) has flat electronic bands and exhibits correlated quantum phases. A spectroscopy technique is demonstrated in this work to dissociate intertwined bands and quantify the energy gaps and Chern numbers C of the correlated states in MATTG. Hard correlated gaps with C = 0 at integer moiré unit cell fillings and charge density wave states originating from van Hove singularities at fractional fillings are uncovered. Displacement-field-driven first-order phase transitions at charge neutrality and v = 2 are also demonstrated. Overall, these properties establish a diverse electrically tunable phase diagram of MATTG.
Article
Multidisciplinary Sciences
Brendan Saxberg, Andrei Vrajitoarea, Gabrielle Roberts, Margaret G. Panetta, Jonathan Simon, David Schuster
Summary: Guiding many-body systems to desired states is a central challenge of modern quantum science. In this study, low-entropy quantum fluids of light were constructed in a Bose-Hubbard circuit using particle-by-particle assembly and adiabatic preparation. The results show the formation of strongly correlated fluids with entanglement and avoidance interactions.
Article
Multidisciplinary Sciences
Di Zhou, D. Zeb Rocklin, Michael Leamy, Yugui Yao
Summary: The research establishes an analytic methodology to define the topological invariant of nonlinear normal modes and shows that strongly nonlinear topological boundary modes are guaranteed by nontrivial topological index.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Ye-Min Zhan, Yu-Ge Chen, Bin Chen, Ziqiang Wang, Yue Yu, Xi Luo
Summary: The article discusses the limitations of Majorana-based quantum gates in universal topological quantum computation and difficulties in realizing Fibonacci-based gates. By decomposing strongly correlated Majorana edge modes in a chiral topological superconductor, a set of complete universal gates are obtained. The application of these gates to Shor's integer factorization algorithm is demonstrated.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Fahad Mahmood, Dipanjan Chaudhuri, Sarang Gopalakrishnan, Rahul Nandkishore, N. P. Armitage
Summary: This study investigates the impact of coherent excitations and photon echoes on the decay processes of doped silicon materials, extracting energy relaxation and decoherence rates close to the metal-insulator transition. The observed linear relationship between rates and excitation frequency, as well as counterintuitive behaviors at different temperatures and doping levels, suggest that the system behaves as a well-isolated electronic system controlled by electron-electron interactions. These observations contribute to a distinct phenomenology, known as the marginal Fermi glass, driven by the interplay of strong disorder and strong electron-electron interactions.
Article
Physics, Multidisciplinary
Matteo Ippoliti, Michael J. Gullans, Sarang Gopalakrishnan, David A. Huse, Vedika Khemani
Summary: The article explores the entanglement phase transition that unitary circuits can undergo with repeated projective measurements. Surprisingly, it is found that entanglement phase transitions can occur even in the absence of scrambling unitary dynamics, being primarily driven by measurements. The main driving force behind these transitions is the frustration caused by the mutual incompatibility of the measurements.
Article
Physics, Multidisciplinary
Stephen F. Taylor, Fan Yang, Brandon A. Freudenstein, Benjamin L. Lev
Summary: The SQCRAMscope, a quantum sensor imaging electromagnetic fields emitted from nearby samples using a quasi-1D quantum gas, has been improved by reducing cryogen usage, enhancing cryogenic cooling, and streamlining sample exchange and quantum gas preparation processes. These improvements have successfully lowered the minimum accessible sample temperature from 35 K to 5.7 K while maintaining low sample vibrations.
Article
Physics, Multidisciplinary
D. A. Abanin, J. H. Bardarson, G. De Tomasi, S. Gopalakrishnan, V Khemani, S. A. Parameswaran, F. Pollmann, A. C. Potter, M. Serbyn, R. Vasseur
Summary: Through analyzing the measures in the study of many-body localization, it is found that their utility in probing the transition and the localized phase can be severely impacted due to strong finite-size effects.
Article
Physics, Multidisciplinary
Sarang Gopalakrishnan, Michael J. Gullans
Summary: With increasing postselection strength, a quantum system can undergo a spectral phase transition of the non-Hermitian Hamiltonian, where one phase retains a mixed state and develops volume-law entanglement, while the other phase approaches a unique pure state with low entanglement from an arbitrary initial state. The transition is identified with an exceptional point in the spectrum of the non-Hermitian Hamiltonian, where PT symmetry is spontaneously broken, and is characterized using exact diagonalization and an approximate mean-field theory.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
A. Zabalo, M. J. Gullans, J. H. Wilson, R. Vasseur, A. W. W. Ludwig, S. Gopalakrishnan, David A. Huse, J. H. Pixley
Summary: This study investigates the measurement-induced phase transitions in quantum many-body systems and finds that generic and Clifford MIPTs for qubits belong to different universality classes.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Javier Lopez-Piqueres, Sarang Gopalakrishnan, Romain Vasseur
Summary: This paper investigates the onset of thermalization and diffusive hydrodynamics in the Rule 54 model, computes the diffusion constant of tracer particles perturbatively, and discusses its relation to transport coefficients.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Multidisciplinary Sciences
Jacopo De Nardis, Sarang Gopalakrishnan, Romain Vasseur, Brayden Ware
Summary: In this study, we investigate spin transport in the easy-axis Heisenberg spin chain subject to various integrability-breaking perturbations. We find that the spin transport exhibits subdiffusive behavior characterized by a dynamical exponent z = 4, which persists for a significantly long timescale in the presence of anisotropy. In the limit of infinite anisotropy, the transport remains subdiffusive at all times, while for finite anisotropy, diffusion eventually emerges at late times with a diffusion constant determined solely by the anisotropy value.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Review
Physics, Multidisciplinary
Sarang Gopalakrishnan, Romain Vasseur
Summary: This article reviews the transport properties of the XXZ spin chain using a intuitive quasiparticle picture based on the framework of generalized hydrodynamics. It discusses the emergence of anomalous linear response properties from hierarchies of quasiparticles in both integrable and near-integrable limits, with a focus on the role of hydrodynamic fluctuations. The article also comments on recent developments including non-linear response, full-counting statistics, and far-from-equilibrium transport, and provides an overview of recent numerical and experimental results on transport in XXZ spin chains.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Review
Physics, Multidisciplinary
Lauriane Chomaz, Igor Ferrier-Barbut, Francesca Ferlaino, Bruno Laburthe-Tolra, Benjamin L. Lev, Tilman Pfau
Summary: Since the achievement of quantum degeneracy in gases of chromium atoms in 2004, the experimental investigation of ultracold gases made of highly magnetic atoms has blossomed, yielding the observation of unprecedented phenomena. This review aims to present the unique aspects of the magnetic quantum-gas platform for exploring ultracold and quantum physics and give an overview of experimental achievements.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Quantum Science & Technology
Ronen M. Kroeze, Brendan P. Marsh, Kuan-Yu Lin, Jonathan Keeling, Benjamin L. Lev
Summary: In this work, a confocal-cavity-QED microscope is used to achieve cooperativity exceeding 110, which is comparable to the best single-mode cavities. This is made possible by the dispersive coupling to the atoms of many near-degenerate modes in the cavity, providing important insights for studying quantum many-body physics in the driven-dissipative setting.
Article
Optics
Kuan-Yu Li, Yicheng Zhang, Kangning Yang, Kuan-Yu Lin, Sarang Gopalakrishnan, Marcos Rigol, Benjamin L. Lev
Summary: We investigate the impact of tunable integrability-breaking dipole-dipole interactions on the equilibrium states of 1D Bose gases of dysprosium at low temperatures. Our experimental results show that in the strongly correlated Tonks-Girardeau regime, rapidity and momentum distributions are unaffected by the dipolar interactions. However, significant changes occur when the strength of the contact interactions is decreased. We propose a model that captures the main experimental observations by considering the system as an array of 1D gases with only contact interactions, dressed by the contribution of the short-range part of the dipolar interactions.
Article
Multidisciplinary Sciences
David Wei, Antonio Rubio-Abadal, Bingtian Ye, Francisco Machado, Jack Kemp, Kritsana Srakaew, Simon Hollerith, Jun Rui, Sarang Gopalakrishnan, Norman Y. Yao, Immanuel Bloch, Johannes Zeiher
Summary: Researchers experimentally investigated the relaxation of domain walls in spin chains in a cold-atom quantum simulator and found that it is governed by the KPZ dynamical exponent. They also discovered that the occurrence of KPZ scaling requires both integrability and a nonabelian SU(2) symmetry. Additionally, they used a quantum gas microscope to measure an observable based on spin-transport statistics and observed the nonlinearity characteristic of KPZ universality.
