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

Article

关键词: COPPER-OXIDE METALS;    SUPERCONDUCTORS;    INSULATORS;    ENERGY;    PHASE;   

DOI  :  10.1103/PhysRevB.90.075102

来源: SCIE

【 摘 要 】

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.

【 授权许可】

Free