Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-12-23
Physics
Condensed Matter
Strongly Correlated Electrons
4.5 pages, 6 figures
Scientific paper
Haldane model is a noninteracting model for spinless fermions showing nontrivial topological properties. Effect of the electron-electron interaction on the topological phase poses an intriguing question. By means of the Hartree-Fock mean field, the exact diagonalization and the constrained-path Monte Carlo methods we mapped out the phase diagram of the interacting Haldane model. It is found that interaction breaks down the topological phase and drives the system into the charge-density-wave state. Sequence of the two transitions depends on the strength of next-nearest-neighbor hopping. Many-body Chern number and the charge excitation gap are used to characterize the topological transition.
Dai Xian-Xin
Shi Hao
Wang Lei
Wang Xiaoqun
Xie Xin-Chen
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