3 papers
quant-ph2019
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…
cond-mat.str-el2019
Knot Topology in Quantum Spin System
X. M. Yang, L. Jin, Z. Song
Knot theory provides a powerful tool for the understanding of topological matters in biology, chemistry, and physics. Here knot theory is introduced to describe topological phases…
cond-mat.str-el2018
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…