56 citations · 177 across the 18 of their papers we have counts for
18 papers
Floquet-Sambe Bottleneck and Frequency-Selective Localization in a Driven Synthetic Spin Chain
J. Cao, K. L. Zhang, R. Wang +1
We study a finite Floquet chain in which a uniform nearest-neighbor hopping coexists with a periodically rotating, \textrm{SU(2)}-dictated spin-assisted hopping profile. The result…
Magnetic Bloch oscillations in a non-Hermitian quantum Ising chain
K. L. Zhang, Z. Song
We investigate the impacts of an imaginary transverse field on the dynamics of magnetic domain walls in a quantum Ising chain. We show that an imaginary field plays a similar role…
Dynamics of non-Hermitian Floquet Wannier-Stark system
H. P. Zhang, K. L. Zhang, Z. Song
We study the dynamics of the non-Hermitian Floquet Wannier-Stark system in the framework of the tight-binding approximation, where the hopping strength is a periodic function of ti…
Topological bulk and edge correlations of BCS condensate in a two-dimensional singlet-triplet spin pairing model
E. S. Ma, K. L. Zhang, Z. Song
The condensate of the Bardeen-Cooper-Schrieffer (BCS) pair in the ground state, which may contain information on both topology and spin pairing, promises the superconductivity of t…
Steady helix states in a resonant XXZ Heisenberg model with Dzyaloshinskii-Moriya interaction
E. S. Ma, K. L. Zhang, Z. Song
We systematically investigate possible helix states in XXZ Heisenberg model with Dzyaloshinskii-Moriya (DM) interaction. Exact solutions show that a set of precession helix states…
Dynamic generation of nonequilibrium superconducting states in Kitaev chain
Y. B. Shi, K. L. Zhang, Z. Song
Non-equilibrium state can exhibit the same macroscopic properties, such as conductivity or superconductivity, as a static state when they share the identical average of an observab…
Signature of edge states in resonant wave scattering
H. S. Xu, K. L. Zhang, L. Jin +1
Particle beam scattering is a conventional technique for detecting the nature of matter. We studied the scattering problem of a cluster connected to multiple leads. We established…
Building ground states of Hubbard model by time-ordered bound-pair injection
K. L. Zhang, Z. Song
According to energy band theory, ground states of a normal conductor and insulator can be obtained by filling electrons individually into energy levels, without any restrictions. I…
Transition from degeneracy to coalescence: theorem and applications
P. Wang, K. L. Zhang, Z. Song
Exceptional point (EP) is exclusive for non-Hermitian system and distinct from that at a degeneracy point (DP), supporting intriguing dynamics, which can be utilized to probe quant…
Topologically protected two-fluid edge states
K. L. Zhang, Z. Song
Edge states reveal the nontrivial topology of energy band in the bulk. As localized states at boundaries, many-body edge states may obey a special symmetry that is broken in the bu…
Resonant-amplified and invisible Bragg scattering based on spin coalescing modes
K. L. Zhang, Z. Song
Unlike a real magnetic field, which separates the energy levels of particle with opposite spin polarization, a complex field can lead to a special kind of spectral degeneracy, know…
Dynamic crystallization in a quantum Ising chain
K. L. Zhang, Z. Song
The topological degeneracy of ground states in transverse field Ising chain cannot be removed by local perturbation and allows it to be a promising candidate for topological comput…
Ising chain with topological degeneracy induced by dissipation
K. L. Zhang, Z. Song
The ground-state degeneracy of the quantum spin system is a characteristic of nontrivial topology, when it is gapped and robust against disordered perturbation. The corresponding q…
Anderson localization induced by complex potential
R. Wang, K. L. Zhang, Z. Song
Uncorrelated disorder potential in one-dimensional lattice definitely induces Anderson localization, while quasiperiodic potential can lead to both localized and extended phases, d…
Helical resonant transport and purified amplification at an exceptional point
K. L. Zhang, L. Jin, Z. Song
We propose an application of a parity-time symmetric non-Hermitian Su-Schrieffer-Heeger (SSH) model by embedded it in a two-dimensional square lattice tube. The coalescence state a…
Manifestation of a topological gapless phase in a two-dimensional chiral symmetric system through Loschmidt echo
K. L. Zhang, Z. Song
Unlike the edge state of a topological insulator where its energy level lives in the bulk energy gap, the edge state of a topological semimetal hides in the bulk spectrum and is di…
Topological Phase Transition Independent of System Non-Hermiticity
K. L. Zhang, H. C. Wu, L. Jin +1
Non-Hermiticity can vary the topology of system, induce topological phase transition, and even invalidate the conventional bulk-boundary correspondence. Here, we show the introduci…
Simple harmonic oscillation in non-Hermitian SSH chain at exceptional point
K. L. Zhang, P. Wang, G. Zhang +1
The balance of gain and loss in an open system may maintain certain Hermitian dynamical behaviors, which can be hardly observed in a popular Hermitian system. In this paper, we sys…