Article
Materials Science, Multidisciplinary
A. A. Zvyagin
Summary: The expectation value of the edge Majorana operator in a one-dimensional model of spinless fermions with nearest-neighbor interactions and open boundary conditions was calculated. It was found that this expectation value is formed by contributions from bulk states and localized edge modes.
Article
Physics, Multidisciplinary
Yotam Shapira, Tom Manovitz, Nitzan Akerman, Ady Stern, Roee Ozeri
Summary: Research on many-body systems of quantum interacting particles with broken time-reversal symmetry is important for understanding a variety of collective behaviors. Quantum simulators are potential tools for exploring and understanding such systems. However, achieving programmable interactions, strong time-reversal symmetry breaking, and high-fidelity quantum control in a scalable manner is challenging.
Article
Physics, Multidisciplinary
Jianlong Fu
Summary: The study focuses on free fermionic models with Majorana zero modes using the Majorana orthogonal transformation, exploring the vortex Majorana zero modes and degeneracy splitting of multiple vortices in topological superconductors, and analyzing Majorana zero modes in lattice models. Various one-dimensional and two-dimensional models are discussed as examples and building blocks for composite models, demonstrating the systematic construction of models hosting Majorana zero modes through Majorana orthogonal transformations.
Article
Mathematics, Applied
Taoufik Bakri, Ferdinand Verhulst
Summary: This study investigates the complex behavior of quadratic three-dimensional autonomous systems and discovers families of tori and periodic solutions involving canards. Through the application of time-reversal and symmetry, the analysis and origin of tori, periodic solutions, and the numerics of these objects in these systems are explained. Furthermore, the study reveals the existence of unbounded solutions and a new chaotic attractor in system NE9, as well as torus destruction through a period-doubling scenario.
Article
Optics
Gang Zhang, Mingxia Huo, Ying Li
Summary: This paper presents a framework of quantum tomography in fermionic systems, where the superselection rule for fermions imposes constraints on states, processes, and measurements. Due to these constraints, only partial reconstruction of operations acting on a subset of fermion modes is possible, with full reconstruction requiring at least one additional ancillary fermion mode.
Article
Materials Science, Multidisciplinary
I Maccari, E. Babaev
Summary: A bosonic metallic state that breaks the Z2 time-reversal symmetry has been detected recently in Ba1???xKxFe2As2. Monte Carlo simulations were conducted to investigate the emergence of this phase in a two-component London model.
Article
Materials Science, Multidisciplinary
Shruti Agarwal, Shreekant Gawande, Satoshi Nishimoto, Jeroen Van den Brink, Sanjeev Kumar
Summary: Using a combination of mean-field Bogoliubov-de Gennes approach and density matrix renormalization group method, we discovered first-order topological transitions between topological superconducting and trivial insulating phases in a sawtooth lattice of intersite attractive fermions. The topological properties of different phases were characterized in terms of winding numbers, Majorana edge modes, and entanglement spectra. By studying the effect of disorder on first-order topological phase transitions, we established disorder-induced topological phase coexistence as a mechanism for generating a finite density of Majorana particles.
Article
Materials Science, Multidisciplinary
Yingping Mou, R. Mondaini, R. T. Scalettar
Summary: This paper explores the properties of weightings in quantum Monte Carlo simulations to resolve the controversies in the phase diagram of the bilayer Hubbard model and discovers the crossover between correlated and uncorrelated band insulators under strong interactions.
Article
Physics, Multidisciplinary
Hadiseh Alaeian, Berislav Buca
Summary: In this study, by utilizing modulated dynamical symmetries, the existence of multistability in the presence of quantum fluctuations is exactly proven in a driven-dissipative fermionic chain. Unlike the mean-field level, the quantum fluctuations themselves exhibit multistability.
COMMUNICATIONS PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Nahom K. Yirga, David K. Campbell
Summary: The study introduces an expansion method that deals with the frequency and momentum dependencies of the vertices in fRG equations in a systematic way. The linear integral equations resulting from the expansion offer computational advantages and yield stable solutions for various Hamiltonians. In practical applications, the fRG flow converges to stable vertices and self-energies, allowing for extraction of various correlation functions and susceptibilities.
Article
Materials Science, Multidisciplinary
Robert A. Jones, Max A. Metlitski
Summary: This paper investigates the boundary problem of root SPT phase with symmetry group G = Z(2) x Z(2)(f) in (2+1)D fermion SPTs. By processing the bulk model, it derives a one-dimensional lattice model for the boundary and finds that it realizes an Ising conformal field theory with a stable gapless boundary state.
Article
Physics, Nuclear
Zhi-zhong Xing
Summary: This study investigates the characteristics of the effective mass term of fundamental Dirac or Majorana fermions and proposes that the translational flavor symmetry should be the natural starting point for building viable fermion mass models.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2022)
Article
History & Philosophy Of Science
Cristian Lopez, Michael Esfeld
Summary: In this paper, we propose an alternative interpretation of time-reversal symmetry in philosophy of physics: Humean time-reversal symmetry. According to this interpretation, time-reversal symmetry is understood as a heuristic, epistemic virtue of the best system, rather than a property of the Humean mosaic. One consequence of this view is that one of the main arguments against a primitive direction of time is rendered harmless, paving the way for primitivism about the direction of time.
Article
Physics, Multidisciplinary
Soroush Zare, Hassan Hassanabadi, Georg Junker
Summary: In this paper, we investigate the relativistic quantum dynamics of a neutral Dirac particle with a permanent magnetic dipole moment interacting with an external magnetic field in the background space-time of a linear topological defect called spiral dislocation. The generalized Dirac wave equation is derived from the full action of the model, which includes the Lagrangian density of the Dirac spinor field in the background and the interaction model. The energy eigenvalues and corresponding wave functions are obtained in closed form by reducing the problem to that of a non-relativistic particle moving freely on a plane with a hole at the origin whose radius is determined by the defect parameter. In the limit of vanishing external magnetic field, a hidden SUSY structure of the underlying Dirac Hamiltonian is established, allowing for a detailed discussion of the non-relativistic limit.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Materials Science, Multidisciplinary
Shuhei Ohyama, Ken Shiozaki, Masatoshi Sato
Summary: This paper investigates the generalized Thouless pumps in (1+1)-dimensional interacting fermionic systems. By using matrix product states to describe the systems, the authors construct nontrivial pumps in both trivial and nontrivial phases and prove their stability against interactions. Furthermore, topological invariants for the pumps are defined and shown to be consistent with existing results, providing a characterization of the SRE states that is not captured by higher dimensional Berry curvature.
Article
Physics, Multidisciplinary
Changhua Bao, Hongyun Zhang, Teng Zhang, Xi Wu, Laipeng Luo, Shaohua Zhou, Qian Li, Yanhui Hou, Wei Yao, Liwei Liu, Pu Yu, Jia Li, Wenhui Duan, Hong Yao, Yeliang Wang, Shuyun Zhou
Summary: Researchers have reported direct experimental evidence of chiral symmetry breaking (CSB) in Li-intercalated graphene, showing gap opening at the Dirac point, Kekule-O type modulation, and chirality mixing near the gap edge. This work opens up opportunities for investigating CSB related physics in a Kekule-ordered graphene.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Kevin S. Huang, Zhaoyu Han, Steven A. Kivelson, Hong Yao
Summary: In this study, a density-matrix renormalization-group study was conducted on PDW superconducting states on long triangular cylinders, revealing strong quasi-long-range PDW order, divergent PDW susceptibility, and the spontaneous breaking of time-reversal and inversion symmetries. The state was identified as valley-polarized and the PDW was found to arise from intra-pocket pairing with an incommensurate center of mass momentum. This study also observed an unusual realization of a Luther-Emery liquid in the two-leg case.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Shi-Xin Zhang, Zhou-Quan Wan, Chee-Kong Lee, Chang-Yu Hsieh, Shengyu Zhang, Hong Yao
Summary: The variational quantum-neural hybrid eigensolver (VQNHE) is introduced in this study, which enhances the shallow-circuit quantum Ansatz by combining classical post-processing with neural networks. Experimental results show that VQNHE consistently outperforms VQE in simulating ground-state energies of quantum spins and molecules, and it represents the first scalable method to exponentially accelerate VQE with nonunitary postprocessing efficiently implemented in the NISQ era.
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Shi-Xin Zhang, Chang-Yu Hsieh, Shengyu Zhang, Hong Yao
Summary: Quantum architecture search (QAS) automates the process of engineering quantum circuits and aims to construct a powerful and general platform that can accelerate the identification of quantum advantages. In this paper, we propose a general framework of differentiable quantum architecture search (DQAS) and demonstrate its capabilities in various circuit design problems. These results highlight the potential of DQAS as a valuable tool for NISQ application developments and present an interesting research topic from a theoretical perspective.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Jin-Tao Jin, Kun Jiang, Hong Yao, Yi Zhou
Summary: This study demonstrates that spontaneous time-reversal symmetry breaking can arise naturally from the interaction between pair density wave ordering at multiple momenta and nesting of Fermi surfaces. The results have important implications for future experiments and real materials such as CsV3Sb5.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Shuo Liu, Shi-Xin Zhang, Chang-Yu Hsieh, Shengyu Zhang, Hong Yao
Summary: In this letter, a simple disorder-free periodically driven model is proposed that exhibits nontrivial discrete time crystal (DTC) order stabilized by Stark many-body localization (MBL). The existence of the DTC phase is demonstrated through analytical analysis and numerical evidence. This new DTC model opens up a new promising avenue for experiments and deepens our understanding of DTCs.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Yi-Ming Wu, Zhengzhi Wu, Hong Yao
Summary: In this paper, we theoretically explore the possible orders induced by weak repulsive interactions in twisted bilayer transition metal dichalcogenides (e.g., WSe2) under an out-of-plane electric field. Our renormalization group analysis shows that superconductivity can survive even with the presence of conventional van Hove singularities. We find that topological chiral superconducting states with different Chern numbers appear over a large parameter region with a moiré filling factor around 1.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Shuo Liu, Shi-Xin Zhang, Chang -Yu Hsieh, Shengyu Zhang, Hong Yao
Summary: This study proposes a systematic approach to probe MBL phases using the excited-state variational quantum eigensolver (VQE) and demonstrates convincing results of MBL on a quantum hardware, paving a promising way for future simulations of nonequilibrium systems beyond classical computations in the noisy intermediate-scale quantum (NISQ) era.
Article
Physics, Multidisciplinary
Ming-Rui Li, Ai -Lei He, Hong Yao
Summary: This study proposes a twisted bilayer structure composed of 2D systems and investigates its stable quadratic-band-touching points and exotic physics. The research reveals that exactly flat bands can emerge at specific magic angles with high Chern numbers. Moreover, the effect of Coulomb interactions is considered, and the ground state supports the quantum anomalous Hall effect.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Zhou-Quan Wan, Shi-Xin Zhang, Hong Yao
Summary: As an unbiased method, the quantum Monte Carlo (QMC) method is important for simulating interacting quantum systems. However, it often suffers from the sign problem, which can be mitigated by finding better simulation schemes. In this study, researchers propose a general framework called automatic differentiable sign optimization (ADSO) to automatically search for the best QMC scheme within a given ansatz of the Hubbard-Stratonovich transformation. They apply ADSO to the honeycomb lattice Hubbard model with Rashba spin-orbit coupling and demonstrate its effectiveness in mitigating and even solving the sign problem.
Article
Materials Science, Multidisciplinary
Xun Cai, Zi-Xiang Li, Hong Yao
Summary: This article investigates the Su-Schrieffer-Heeger-Hubbard model and shows that Hubbard interactions can further enhance EPC-induced AFM effects, especially for small phonon frequencies or in adiabatic limit.
Article
Physics, Multidisciplinary
Xiaoyang Shen, Zhengzhi Wu, Linhao Li, Zhehan Qin, Hong Yao
Summary: This Letter investigates the fracton topological order of higher dimensional fracton models at nonzero critical temperature T-c, and demonstrates the existence of a finite critical temperature T-c. By analyzing the free energy of a typical 4D X-cube model using duality, it is shown that a finite critical temperature T-c exists. The expectation value of the 't Hooft loops in the 4D X-cube model reveals a confinement-deconfinement phase transition at finite temperature. Additionally, an alternative no-go theorem for finite-temperature quantum fracton topological order is proposed.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Z. X. Yin, X. Du, W. Z. Cao, J. Jiang, C. Chen, S. R. Duan, J. S. Zhou, X. Gu, R. Z. Xu, Q. Q. Zhang, W. X. Zhao, Y. D. Li, Yi-feng Yang, H. F. Yang, A. J. Liang, Z. K. Liu, H. Yao, Y. P. Qi, Y. L. Chen, L. X. Yang
Summary: This study systematically investigates the electronic structure of the archetypical valence fluctuating compound EuNi2P2, which hosts multiple f electrons, using high-resolution angle-resolved photoemission spectroscopy. The hybridization between Eu 4 f and Ni 3d states is revealed at low temperatures. Interestingly, opposite temperature evolution of electron spectral function above and below the Kondo coherence temperature is observed, which is in contrast to the monotonic valence change and beyond the expectation of the periodic Anderson model.
Article
Materials Science, Multidisciplinary
Ai-Lei He, Wei-Wei Luo, Yuan Zhou, Yi-Fei Wang, Hong Yao
Summary: In this study, two types of topological states are observed in an extended 2D dimerized lattice with staggered flux threading. At 1/2 filling, isolated corner states and metallic near-edge states are observed in the C = 2 Chern insulator states. At 1/4 filling, a C = 0 topological state is found, where the robust edge states are well localized along the edges but bypass corners. These topological insulator states differ from both conventional Chern insulators and the usual high-order topological insulators.
Article
Computer Science, Artificial Intelligence
Shi-Xin Zhang, Chang-Yu Hsieh, Shengyu Zhang, Hong Yao
Summary: Variational quantum algorithms (VQAs) are speculated to provide quantum advantages for practical problems, with Quantum Architecture Search (QAS) being a method to design task-specific Parameterized Quantum Circuits (PQCs). A neural predictor guided QAS is shown to discover powerful quantum circuit solutions, outperforming random search baselines and capable of generalizing to address similar problems.
MACHINE LEARNING-SCIENCE AND TECHNOLOGY
(2021)