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6 papers · 2 filters
Wave emission and absorption at spectral singularities
P. Wang, L. Jin, G. Zhang +1
We studied the critical dynamics of spectral singularities. The system investigated is a coupled resonator array with a side-coupled loss (gain) resonator. For a gain resonator, th…
Quantum phase transition induced by real-space topology
C. Li, G. Zhang, S. Lin +1
A quantum phase transition (QPT), including both topological and symmetry breaking types, is usually induced by the change of global parameters, such as external fields or global c…
Chern number in Ising models with spatially modulated real and complex fields
C. Li, G. Zhang, Z. Song
We study an one-dimensional transverse field Ising model with additional periodically modulated real and complex fields. It is shown that both models can be mapped on a pseudo spin…
Long-range entangled zero-mode state in a non-Hermitian lattice
S. Lin, X. Z. Zhang, C. Li +1
In contrast to a Hermitian system, in which zero modes are usually degenerate and localized edge state in the thermodynamic limit, the zero mode of a finite non-Hermitian system ca…
Majorana charges, winding numbers and Chern numbers in quantum Ising models
G. Zhang, C. Li, Z. Song
Mapping a many-body state on a loop in parameter space is a simple way to characterize a quantum state. The connections of such a geometrical representation to the concepts of Cher…
Reciprocal and unidirectional scattering of parity-time symmetric structures
L. Jin, X. Z. Zhang, G. Zhang +1
Parity-time (PT) symmetry is of great interest. The reciprocal and unidirectional features are intriguing besides the PT symmetry phase transition. Recently, the reciprocal transmi…