Mott Physics and Topological Phase Transition in Correlated Dirac Fermions

Details Mott Physics and Topological Phase Transition in Correlated Dirac Fermions Mott Physics and Topological Phase Transition in Correlated Dirac Fermions

2011-01-05

arxiv.org/abs/1101.0911v1

Phys. Rev. Lett. 107, 010401 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures. Due to the limit of file size, a clear Fig.4 is available on request

Scientific paper

10.1103/PhysRevLett.107.010401

We investigate the interplay between the strong correlation and the spin-orbital coupling in the Kane-Mele-Hubbard model and obtain the qualitative phase diagram via the variational cluster approach. We identify, through an increase of the Hubbard $U$, the transition from the topological band insulator to either the spin liquid phase or the easy-plane antiferromagnetic insulating phase, depending on the strength of the spin-orbit coupling. A nontrivial evolution of the bulk bands in the topological quantum phase transition is also demonstrated.

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