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Xing-Hai Zhang

Publications and source records attributed to Xing-Hai Zhang.

5 recordsLinked to original sources
arXiv2014

Ultracold Quantum Gases in Optical Lattice with Topological Defects: Its Physics and Experimental Proposal

In this paper we give a proposal to realize optical lattices with manipulated dislocations and study the physics of ultracold quantum gas on a two-dimensional (2D) optical square lattice with dislocations. In particular, the dislocations may induce fractional topological flux on 2D Peierls optical lattice. These results pave new approach to study the quantum many-body systems on an optical lattice with controllable topological lattice-defects, including the dislocations, topological fluxes.

cond-mat.quant-gas↗
arXiv2012

Emergent Supersymmetric Many-Body Systems in Doped Z2 Topological Spin Liquid of the Toric-Code Model

In this paper, we studied the doped Z2 topological spin liquid of the toric-code model. We found that the doped holes become supersymmetric particles. The ground state of the doped Z2 topological spin liquid becomes new matters of quantum states - supersymmetric Bose-Einstein condensation or supersymmetric superfluid. As a result, this system provides a unique example of manipulatable supersymmetric many-body system.

cond-mat.str-el↗
arXiv2012

Majorana Edge States for Z2 Topological Orders of the Wen-plaquette Model and the Toric-code Model

In this paper we study the symmetry protected Majorana edge states for the Z2 topological order of the Wen-plaquette model and the toric-code model and calculate the dispersion of the Majorana edge states. For the system with translational symmetry, the Majorana edge states are gapless and have the nodal points at k=0 and k=pi. For the edge states of the toric-code model without translational symmetry, the edge modes become gapped.

cond-mat.str-el↗
arXiv2012

Mott Insulator-Superfluid Transition in a Generalized Bose-Hubbard Model with Topologically Non-trivial Flat-Band

In this paper, we studied a generalized Bose-Hubbard model on a checkerboard lattice with topologically nontrivial flat-band. We used mean-field method to decouple the model Hamiltonian and obtained phase diagram by Landau theory of second-order phase transition. We further calculate the energy gap and the dispersion of quasi-particle or quasi-hole in Mott insulator state and found that in strong interaction limit the quasi-particles or the quasi-holes also have flat bands.

cond-mat.quant-gas↗