Article
Materials Science, Multidisciplinary
S. Sajad Dabiri, Hosein Cheraghchi, Ali Sadeghi
Summary: The study investigates the topology of Floquet states and time-averaged optical conductivity in a thin topological insulator lattice model under circularly polarized light, using the extended Kubo formalism. Different driving and occupation regimes are considered, showing quantization of optical Hall conductivity in the ideal occupation mode. The system exhibits rich phases and anomalous edge states when irradiated by a weak on-resonant drive.
Article
Optics
Chunyan Li, Yaroslav Kartashov, Vladimir V. Konotop
Summary: In this study, it was found that a honeycomb array of helical waveguides with a refractive index gradient can support Floquet bound states in the continuum. The formation mechanism of these bound states is attributed to the emergence of crossings and avoided crossings of the branches supported by spatially limited stripe array. Almost all states in the system are localized due to the gradient, with topological edge states exhibiting stronger localization than other states.
Article
Materials Science, Multidisciplinary
S. Sajad Dabiri, Hosein Cheraghchi
Summary: The effects of high-frequency electromagnetic fields on the emergence of quantum phases in thin topological insulators were investigated, with a focus on system parameters influencing the topological phases. It was demonstrated that altering system parameters could induce phase transitions between different types of insulators, which can be observed at low light intensities to avoid heating effects.
Article
Mathematics, Interdisciplinary Applications
Boquan Ren, Yaroslav Kartashov, Hongguang Wang, Yongdong Li, Yiqi Zhang
Summary: Topological edge states can form in periodic materials with specific degeneracies in their modal spectra under the breaking of certain symmetries. Unconventional topological edge states can exist in Floquet insulators based on arrays of helical waveguides with hybrid edges, even if the hybrid edges are long. These edge states are topologically protected and persist in the presence of focusing nonlinearity of the material, expanding the variety of geometrical shapes in which topological insulators can be constructed.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Physics, Multidisciplinary
Domenico Bongiovanni, Dario Jukic, Zhichan Hu, Frane Lunic, Yi Hu, Daohong Song, Roberto Morandotti, Zhigang Chen, Hrvoje Buljan
Summary: In the evolving Su-Schrieffer-Heeger lattices made of interacting soliton arrays, dynamical topological phase transitions occur entirely driven by nonlinearity. The transitions involve a periodic shift from topologically trivial-to-nontrivial phases, with crossovers from topologically nontrivial-to-trivial regimes. The signature of the phase transition is the closing and reopening of the gap, where extended states become localized topological edge states through decoupling from the lattice bulk.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Ning Dai, Kai Li, Yan-Bin Yang, Yong Xu
Summary: In this study, we theoretically demonstrate the existence of topological gapless Shiba bands on a magnetically doped s-wave superconducting surface with Rashba spin-orbit coupling. We also find the mechanism that protects the first-order quantum phase transitions for the intrinsic thermal Hall conductance.
Article
Optics
Wange Song, Yuxin Chen, Hanmeng Li, Shenglun Gao, Shengjie Wu, Chen Chen, Shining Zhu, Tao Li
Summary: The research demonstrates a gauge-induced topological state localized at the interface between two gauge-shifted Floquet photonic lattices with the same topological order, allowing for asymmetric topological transport and experimental verification in silicon waveguides. This work provides new insights into manipulating optical topological modes through Floquet engineering and opens up possibilities for photonics integrations.
LASER & PHOTONICS REVIEWS
(2021)
Article
Nanoscience & Nanotechnology
Xin Qiao, Luojia Wang, Guangzhen Li, Xianfeng Chen, Luqi Yuan
Summary: Synthetic frequency dimensions offer important opportunities for investigating novel topological phenomena. In this study, a Floquet SSH model with time-dependent hoppings is explored by ultrastrongly modulating ring resonators, leading to the separation of originally degenerate topological states and the emergence of a series of edge states with complex multi-frequency oscillations. This system with stronger modulations widens the bandgap, providing an effective way to localize pulses in synthetic frequency dimensions.
Article
Materials Science, Multidisciplinary
Lucien Jezequel, Pierre Delplace
Summary: We propose a method to address the existence of topological edge modes in one-dimensional nonlinear lattices by deforming the edge modes of linearized models into solutions of the fully nonlinear system. We identify a class of nonlinearities satisfying a generalized chiral symmetry where this mechanism is forbidden, and the nonlinear edge states are protected by a topological order parameter.
Article
Physics, Multidisciplinary
Daniel Leykam, Daria A. Smirnova
Summary: Topological invariants characterizing filled bands in electronic materials cannot be directly applied to bosonic systems. Instead, the topological invariants in bosonic systems can be determined by transitions from bound to leaky modes in photonic lattices.
Article
Optics
Zhaoyuan Wang, Wenjin Ma, Yi Hu, Zhigang Chen, Jingjun Xu
Summary: This study demonstrates interface states between two Floquet-driven photonic lattices with opposite chirality, and investigates their properties and characteristics. Unexpected localized behaviors were observed experimentally, and a continuum model provided a clearer explanation for these behaviors.
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
Optics
Shengjie Wu, Wange Song, Zhiyuan Lin, Chen Chen, Shining Zhu, Tao LI
Summary: This study demonstrates the possibility of generating nontrivial Floquet topological phase and photonic rt modes through long-range coupling in a one-dimensional periodically driven optical lattice. Analyzing the replica bands, we reveal the quasienergies band crossing and reopening of new nontrivial rt gaps due to the long-range coupling. These results offer a new route in manipulating optical topological modes by Floquet engineering with long-range coupling.
Review
Materials Science, Multidisciplinary
Shiqi Xia, Daohong Song, Nan Wang, Xiuying Liu, Jina Ma, Liqin Tang, Hrvoje Buljan, Zhigang Chen
Summary: The article reviews recent work demonstrating topological phenomena in reconfigurable photonic lattices, including one-dimensional nonlinear topological states and gap solitons, as well as two-dimensional universal mapping of topological singularities in momentum space and realization of nontrivial loop states in real space in photonic lattices.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
Georgios G. Pyrialakos, Anestis Apostolidis, Mercedeh Khajavikhan, Nikolaos Kantartzis, Demetrios N. Christodoulides
Summary: We propose an alternative design approach in Floquet topology by introducing a dual-helix modulation scheme that supports both clockwise and counterclockwise helicity in a singular unit cell. This results in a band structure that can deform between a conventional phase with crossed edge states and an antichiral phase with tilted unidirectional states. We identify and characterize a family of tilted and overtilted edge states, showing that integer Chern and winding numbers can successfully characterize lattices without global topological gaps.
Article
Physics, Multidisciplinary
Ran Qi, Zheyu Shi, Hui Zhai
Summary: Studied the impact of time-dependent interatomic interactions on quantum gas energy density growth. Results show that controlling the time dependence can affect the rate of energy density growth, which is also significant for experiments with ultracold atomic gases.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Libo Liang, Wei Zheng, Ruixiao Yao, Qinpei Zheng, Zhiyuan Yao, Tian-Gang Zhou, Qi Huang, Zhongchi Zhang, Jilai Ye, Xiaoji Zhou, Xuzong Chen, Wenlan Chen, Hui Zhai, Jiazhong Hu
Summary: The article presents a novel method of probing quantum many-body correlation by ramping dynamics. The researchers demonstrate this method experimentally by studying the Bose-Hubbard model with ultracold atoms in three-dimensional optical lattices. This method provides important insights into the physical properties of quantum systems.
Article
Quantum Science & Technology
Fan Yang, Hui Zhai
Summary: In this work, a protocol to measure quantized nonlinear transport using ultracold atomic Fermi gases is proposed. Practical effects in experiments are investigated and a method to reduce deviation is proposed based on symmetry considerations. The quantized nonlinear response can be observed reasonably well under experimental conditions readily achieved with ultracold atoms.
Article
Physics, Multidisciplinary
Yanting Cheng, Chengshu Li, Hui Zhai
Summary: Recently, the Rydberg blockade effect has been used to realize quantum spin liquid (QSL) on a kagome lattice, and evidence of QSL has been obtained experimentally by measuring non-local string order. In this paper, a Bardeen-Cooper-Schrieffer (BCS)-type variational wave function study is reported for the spin liquid state in this model, which is motivated by mapping the Rydberg blockade model to a lattice gauge theory. The predictions of this wave function are compared with experimental measurements of non-local string order, and good agreement is found.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Chang Liu, Haifeng Tang, Hui Zhai
Summary: In this paper, the authors generalize Krylov complexity from a closed system to an open system coupled to a Markovian bath, where Lindbladian evolution replaces Hamiltonian evolution. They show that the Krylov complexity in open systems can be mapped to a non-Hermitian tight-binding model in a half-infinite chain. The strength of the non-Hermitian terms increases linearly with the increase of the Krylov basis index n.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Quantum Science & Technology
Yanting Cheng, Shang Liu, Wei Zheng, Pengfei Zhang, Hui Zhai
Summary: This article introduces the realization of the one-dimensional lattice Schwinger model using bosons and Rydberg-atom arrays, and discusses methods to study confinement and deconfinement by varying the mass of the matter field and tuning the topological angle.
Article
Physics, Multidisciplinary
Lei Pan, Hui Zhai
Summary: In this Letter, a composite spin representation is proposed to provide a unified description for the correlated effects in Rydberg atom arrays. The ground state and excitation spectrum can be accurately described using composite spins, and the differences between arrays with different blocking radii can be absorbed in the formation of composite spins. This scheme offers a universal physical picture of the blockade effect in Rydberg atom arrays.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Tian-Gang Zhou, Yi-Neng Zhou, Pengfei Zhang, Hui Zhai
Summary: This article studies the connection between quantum chaos in Hermitian systems and the skin effect in non-Hermitian systems, and unifies them through the concept of space-time duality.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Zhiyuan Yao, Lei Pan, Shang Liu, Hui Zhai
Summary: In this paper, we investigate the PXP Hamiltonian with an external magnetic field and discover surprising connections between quantum scar states and quantum criticality. We show that the quantum many-body scar states can be traced to quantum critical states and the violation of quantum thermalization diminishes in the quantum critical regime. These findings are important for the verification on existing cold atom experiment platforms.
Article
Computer Science, Artificial Intelligence
Juan Yao, Ce Wang, Zhiyuan Yao, Hui Zhai
Summary: In this work, a neural network-based method is developed to solve the problem of analytic continuation, which is an important bridge between many-body theories and experiments. The trained neural network shows the best performance when a proper amount of noise is added to the training data. The method can successfully capture multi-peak structure in the resulting response function and can be combined with Monte Carlo simulations for comparing with experiments on real-time dynamics.
MACHINE LEARNING-SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Peng Xu, Wei Zheng, Hui Zhai
Summary: The Floquet Hamiltonian is not sufficient to accurately describe a time-periodic system. A set of Hamiltonians spanning all values of the micromotion parameter is needed to provide an accurate description. These micromotion parameters can be seen as an extra dimension of the system, and the topological invariants defined in this higher-dimensional system can ensure the presence of edge states in the lower-dimensional Floquet system.
Article
Physics, Multidisciplinary
Yadong Wu, Pengfei Zhang, Hui Zhai
Summary: By characterizing quantum information scrambling through operator size growth, we introduce an averaged operator size to describe the information scrambling ability of a quantum neural network architecture, suggesting a positive correlation with learning efficiency. Our study on various architectures and learning tasks shows that architectures with larger averaged operator size exhibit higher learning efficiency, indicated by faster decrease in loss function or increase in prediction accuracy as training epochs increase.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Yadong Wu, Juan Yao, Pengfei Zhang, Hui Zhai
Summary: The study investigates how a deep quantum neural network can approximate a target function as accurately as possible, finding that accuracy is achievable when input wave functions in the dataset do not span the entire Hilbert space.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Optics
Peng Xu, Tian-Shu Deng, Wei Zheng, Hui Zhai
Summary: By combining two-photon Raman transition and periodic modulation of spin-dependent interaction, we propose a method for realizing density-dependent spin-orbit coupling in ultracold Bose and Fermi gases. This method leads to the occurrence of both direct Raman process and interaction-assisted Raman process, which have opposite effects in terms of spin-momentum locking and compete with each other. As the interaction modulation increases, the system undergoes a crossover from the direct Raman process dominated regime to the interaction-assisted Raman process dominated regime.
Article
Physics, Multidisciplinary
Tian-Gang Zhou, Lei Pan, Yu Chen, Pengfei Zhang, Hui Zhai
Summary: Understanding strongly interacting quantum matter and quantum gravity are important open issues in theoretical physics. The holographic duality between quantum field theory and gravity theory helps connect these two topics. By utilizing gravity physics, this paper explains the quench dynamics observed in various quantum systems and finds universal features across different parameter regimes.
PHYSICAL REVIEW RESEARCH
(2021)
