Spontaneous loop-spin current with topological characters in the Hubbard model
arXiv:1405.3808 · doi:10.1103/PhysRevB.90.075102
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.
8 pages, 9 figures
References in corpus (11)
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- Topological Mott Insulators
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- Simplified topological invariants for interacting insulators
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- Manifestly gauge independent formulations of the Z2 invariants