Spontaneous loop-spin current with topological characters in the Hubbard model

Shimpei Goto, Keisuke Masuda, Susumu Kurihara

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    Abstract

    We find a state characterized by a spontaneous loop-spin current and a single-particle gap in the Hubbard model within the variational cluster approach. This state exists for arbitrarily small interaction in a half-filled honeycomb lattice. Moreover, from the calculations of the topological invariants for the interacting system, it is shown that this gapped state has nontrivial topological characters; this state is the topological Mott insulating state. This result implies the ubiquity of topological Mott insulating phases.

    Original languageEnglish
    Article number075102
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume90
    Issue number7
    DOIs
    Publication statusPublished - 2014 Aug 4

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    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

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