Quantum Monte Carlo simulations on interaction effects in the 2D Kane-Mele-Hubbard model

ORAL

Abstract

Interaction effects in topological insulators remain an open question. We have proved that the determinant quantum Monte-Carlo simulation on the two dimensional Kane-Mele model augmented by the Hubbard interaction is free of the sign-problem. Consequentially, the interplay between band topology and strong interaction can be studied at a high numeric precision. The process how the topological band insulator evolves into the antiferromagnetic Mott insulator as increasing interaction strength is studied by calculating both the bulk and edge electronic properties. The possibility of an exotic topological Mott-insulator is examined.

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Authors

  • Dong Zheng

    The Department of Physics, Tsinghua University

  • Congjun Wu

    The department of Physics, Univeristy of California, San Diego, The Department of Physics, Univeristy of California, San Diego, The Department of Physics, University of California, San Diego, Department of Physics, University of California, San Diego, UC San Diego, The Department of Physics, University of Science and Technology of China, University of California, San Diego

  • Guang-Ming Zhang

    The Department of Physics, University of California, San Diego