39 citations · 191 across the 17 of their papers we have counts for
17 papers
Pair Filters in an Extended Hubbard Model at Resonance
Ensuo Ma, Zhi Song
We investigate the dynamics of bound pairs in an extended Hubbard model at resonance. We show that a single fermion and a singlet bound pair possess identical dispersion relations…
Hierarchic superradiant phases in anisotropic Dicke model
D. K. He, Z. Song
We revisit the phase diagram of an anisotropic Dicke model by revealing the non-analyticity induced by underlying exceptional points. We find that, from a dynamical perspective, th…
Coalescing hardcore-boson condensate states with nonzero momentum
C. H. Zhang, Z. Song
Exceptional points (EPs), as an exclusive feature of a non-Hermitian system, support coalescing states to be alternative stable state beyond the ground state. In this work, we expl…
Resonant generation of -wave Cooper pair in non-Hermitian Kitaev chain at exceptional point
X. M. Yang, Z. Song
We investigate a non-Hermitian extension of Kitaev chain by considering imaginary -wave pairing amplitudes. The exact solution shows that the phase diagram consists two phases w…
Quantum phase transition without gap opening
X. M. Yang, G. Zhang, Z. Song
Quantum phase transitions (QPTs), including symmetry breaking and topological types, always associated with gap closing and opening. We analyze the topological features of the quan…
Spectral singularity in composite systems and simulation of a resonant lasing cavity
X. Z. Zhang, G. R. Li, Z. Song
We investigate herein the existence of spectral singularities (SSs) in composite systems that consist of two separate scattering centers A and B embedded in one-dimensional free sp…