92 citations · 169 across the 5 of their papers we have counts for
5 papers
Critical behavior of the energy gap and its relation with the Berry phase close to the excited state quantum phase transition in the Lipkin model
Zi-Gang Yuan, Ping Zhang, Shu-Shen Li
In our previous work [Phys. Rev. A \textbf{85}, 044102 (2012)], we have studied the Berry phase of the ground state and exited states in the Lipkin model. In this paper, using Hell…
Decoherence of a quantum system coupled to an XY spin chain: Role of the initial state of the spin chain
Zi-Gang Yuan, Ping Zhang, Shu-Shen Li
We study the decoherence of a coupled quantum system consisting of a central spin and its correlated environment described by a general spin-chain model. We make it clear that…
Orbital magnetization of the electron gas on a two-dimensional kagome lattice under a perpendicular magnetic field
Zhigang Wang, Zi-Gang Yuan, Zhen-Guo Fu +2
The orbital magnetization of the electron gas on a two-dimensional kagome lattice under a perpendicular magnetic field is theoretically investigated. The interplay between the latt…
Disentanglement of two qubits coupled to an XY spin chain: Role of quantum phase transition
Zi-Gang Yuan, Ping Zhang, Shu-Shen Li
We study the disentanglement of two spin qubits which interact with a general XY spin-chain environment. The dynamical process of the disentanglement is numerically and analyticall…
Loschmidt Echo and Berry phase of the quantum system coupled to the XY spin chain: Proximity to quantum phase transition
Zi-Gang Yuan, Ping Zhang, Shu-Shen Li
We study the Loschmidt echo (LE) of a coupled system consisting of a central spin and its surrounding environment described by a general XY spin-chain model. The quantum dynamics o…