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Paper detail

Quantum phase transitions in the Kane-Mele-Hubbard model

We study the two-dimensional Kane-Mele-Hubbard model at half filling by means of quantum Monte Carlo simulations. We present a refined phase boundary for the quantum spin liquid. The topological insulator at finite Hubbard interaction strength is adiabatically connected to the groundstate of the Kane-Mele model. In the presence of spin-orbit coupling, magnetic order at large Hubbard U is restricted to the transverse direction. The transition from the topological band insulator to the antiferromagnetic Mott insulator is in the universality class of the three-dimensional XY model. The numerical data suggest that the spin liquid to topological insulator and spin liquid to Mott insulator transitions are both continuous.

preprint2012arXivOpen access
M. HohenadlerZ. Y. MengT. C. LangS. WesselA. MuramatsuF. F. Assaad
cond-mat.str-elquant-ph
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M. HohenadlerZ. Y. MengT. C. LangS. WesselA. MuramatsuF. F. Assaad

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