670 citations · 2.8k across the 53 of their papers we have counts for
31 papers · 1 filter
Stable dynamic helix state in the nonintegrable XXZ Heisenberg model
Gang Zhang, Zhi Song
We investigate the influence of external fields on the stability of spin helix states in an XXZ Heisenberg model. Exact diagonalization on a finite system shows that random transve…
High-order exceptional points in supersymmetric arrays
S. M. Zhang, X. Z. Zhang, L. Jin +1
We employ the intertwining operator technique to synthesize a supersymmetric (SUSY) array of arbitrary size . The synthesized SUSY system is equivalent to a spin- under…
Semi-localization transition driven by a single asymmetrical tunneling
P. Wang, K. L. Zhang, Z. Song
A local impurity usually only strongly affects few single-particle energy levels, thus cannot induce a quantum phase transition (QPT), or any macroscopic quantum phenomena in a man…
Classical correspondence of the exceptional points in the finite non-Hermitian system
X. Z. Zhang, G. Zhang, Z. Song
We systematically study the topology of the exceptional point (EP) in the finite non-Hermitian system. Based on the concrete form of the Berry connection, we demonstrate that the e…
Dynamical topological invariant for non-Hermitian Rice-Mele model
R. Wang, X. Z. Zhang, Z. Song
We study a non-Hermitian Rice-Mele model without breaking time-reversal symmetry, with the non-Hermiticity arising from imbalanced hopping rates. The Berry connection, Berry curvat…
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…