Mott Insulator-Superfluid Transition in a Generalized Bose-Hubbard Model with Topologically Non-trivial Flat-Band
Quantum Gases
2015-06-05 v1 Quantum Physics
Abstract
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.
Keywords
Cite
@article{arxiv.1205.6641,
title = {Mott Insulator-Superfluid Transition in a Generalized Bose-Hubbard Model with Topologically Non-trivial Flat-Band},
author = {Xing-Hai Zhang and Su-Peng Kou},
journal= {arXiv preprint arXiv:1205.6641},
year = {2015}
}
Comments
13 figures, 9 pages