142 citations · 1.3k across the 56 of their papers we have counts for
36 papers · 1 filter
Real-space construction and selection rules of center-of-mass momentum eigenstates in two-dimensional many-body lattices
Ling Lin, Yongguan Ke, Chaohong Lee
We present a comprehensive framework for the real-space construction of center-of-mass (c.m.) momentum eigenstates in two-dimensional (2D) quantum many-body systems. Unlike standar…
Weak ergodicity breaking without nonthermal eigenstates
Boning Huang, Yongguan Ke, Li Zhang +2
The typical mechanisms of ergodicity breaking in isolated interacting quantum systems, such as many-body localization and quantum many-body scars, originate from the nonthermal nat…
Localization and scattering of a photon in quasiperiodic qubit arrays
Xinyin Zhang, Yongguan Ke, Zhengzhi Peng +4
We study the localization and scattering of a single photon in a waveguide coupled to qubit arrays with quasiperiodic spacings. As the quasiperiodic strength increases, localized s…
Photonic scattering in 2D waveguide QED: Quantum Goos-Hänchen shift
Yongguan Ke, Zhenzhi Peng, Muhib Ullah +1
Quantum emitters coupled to traveling photons in waveguides, known as waveguide quantum electrodynamics (WQED), offer a powerful platform for understanding light-matter interaction…
Zero-energy Quantum Many-Body Scar under Emergent Chiral Symmetry and Pseudo Hilbert Space Fragmentation
Li Zhang, Yongguan Ke, Chaohong Lee
Hilbert space fragmentation (HSF) is a mechanism for generating quantum many-body scar (QMBS), which provides a route to weakly break ergodicity. The zero-energy QMBSs widely exist…
Shortcuts to adiabatic Thouless pumping
Wenjie Liu, Yongguan Ke, Chaohong Lee
Thouless pumping, the quantized transport of particles in a cyclic adiabatic evolution, faces a challenge: slow driving may exceed the coherent time, while fast driving may break q…
Interaction-induced multiparticle bound states in the continuum
Boning Huang, Yongguan Ke, Honghua Zhong +2
Bound states in the continuum (BICs) are localized modes residing in the radiation continuum. They were first predicted for single-particle states, and became a general feature of…
Floquet Engineering of Hilbert Space Fragmentation in Stark Lattices
Li Zhang, Yongguan Ke, Ling Lin +1
The concept of Hilbert space fragmentation (HSF) has recently been put forward as a routine to break quantum ergodicity. Although HSF exists widely in models with dynamical constra…
Calculations of Chern number: equivalence of real-space and twisted-boundary-condition formulae
Ling Lin, Yongguan Ke, Li Zhang +1
Chern number is a crucial invariant for characterizing topological feature of two-dimensional quantum systems. Real-space Chern number allows us to extract topological properties o…
Interaction-induced topological pumping in a solid-state quantum system
Ziyu Tao, Wenhui Huang, Jingjing Niu +24
As the basis for generating multi-particle quantum correlations, inter-particle interaction plays a crucial role in collective quantum phenomena, quantum phase transitions, and qua…
Topological invariants for interacting systems: from twisted boundary condition to center-of-mass momentum
Ling Lin, Yongguan Ke, Chaohong Lee
Beyond the well-known topological band theory for single-particle systems, it is a great challenge to characterize the topological nature of interacting multi-particle quantum syst…
Correlated topological pumping of interacting bosons assisted by Bloch oscillations
Wenjie Liu, Shi Hu, Li Zhang +2
Thouless pumping, not only achieving quantized transport but also immune to moderate disorder, has attracted growing attention in both experiments and theories. Here, we explore ho…
Stable interaction-induced Anderson-like localization embedded in standing waves
Na Zhang, Yongguan Ke, Ling Lin +2
We uncover the interaction-induced \emph{stable self-localization} of bosons in disorder-free superlattices. In these nonthermalized multi-particle states, one of the particles for…
Constructing higher-order topological states in higher dimension
Yao Wang, Yongguan Ke, Yi-Jun Chang +4
Higher-order topological phase as a generalization of Berry phase attracts an enormous amount of research. The current theoretical models supporting higher-order topological phases…
Edge states in quantum spin chains: the interplay among interaction, gradient magnetic field and Floquet engineering
Wenjie Liu, Bo Zhu, Li Zhang +2
We explore the edge defects induced by spin-spin interaction in a finite paradigmatic Heisenberg spin chain. By introducing a gradient magnetic field and a periodically-modulated s…
Mobility edge of Stark many-body localization
Li Zhang, Yongguan Ke, Wenjie Liu +1
We investigate many-body localization of interacting spinless fermions in a one-dimensional disordered and tilted lattice. The fermions undergo energy-dependent transitions from er…
Topological pumping assisted by Bloch oscillations
Yongguan Ke, Shi Hu, Bo Zhu +3
Adiabatic quantum pumping in one-dimensional lattices is extended by adding a tilted potential to probe better topologically nontrivial bands. This extension leads to almost perfec…
Quantum Hall phase emerging in an array of atoms interacting with photons
Alexander V. Poshakinskiy, Janet Zhong, Yongguan Ke +4
Topological quantum phases underpin many concepts of modern physics. While the existence of disorder-immune topological edge states of electrons usually requires magnetic fields, d…
Radiative topological biphoton states in modulated qubit arrays
Yongguan Ke, Janet Zhong, Alexander V. Poshakinskiy +3
We study topological properties of bound pairs of photons in spatially-modulated qubit arrays (arrays of two-level atoms) coupled to a waveguide. While bound pairs behave like Bloc…
Topological quantum transport and spatial entanglement distribution via disordered bulk channel
Shi Hu, Yongguan Ke, Chaohong Lee
We show how to implement quantum transport, generate entangled state and achieve spatial entanglement distribution via topological Thouless pumping in one-dimensional disordered la…
Photon-mediated localization in two-level qubit arrays
Janet Zhong, Nikita A. Olekhno, Yongguan Ke +4
We predict the existence of a novel interaction-induced spatial localization in a periodic array of qubits coupled to a waveguide. This localization can be described as a quantum a…
Magnetic phase transitions of insulating spin-orbit coupled Bose atoms in one-dimensional optical lattices
Li Zhang, Yongguan Ke, Chaohong Lee
We consider the insulating spin-orbit coupled Bose atoms confined within one-dimensional optical lattices and explore their ground-state magnetic phase transitions. Under strong in…
Inelastic scattering of photon pairs in qubit arrays with subradiant states
Yongguan Ke, Alexander V. Poshakinskiy, Chaohong Lee +2
We develop a rigorous theoretical approach for analyzing inelastic scattering of photon pairs in arrays of two-level qubits embedded in a waveguide. Our analysis reveals strong enh…
Dynamic winding number for exploring band topology
Bo Zhu, Yongguan Ke, Honghua Zhong +1
Topological invariants play a key role in the characterization of topological states. Due to the existence of exceptional points, it is a great challenge to detect topological inva…