Band and Mott Insulators and Superconductivity in Honeycomb-Lattice Ionic-Hubbard Model
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概要
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Motivated by superconductivity (SC) in layered nitrides, we study an ionic-Hubbard model of a honeycomb lattice, which consists of two sublattices with an energy-level offset, by an optimization variational Monte Carlo method. The parameters for the Coulomb interaction and energy-level offset to realize a band insulator in the nondoped state are evaluated, and the SC state is investigated in a carrier-doped band insulator. It is found that, in a weakly doped band insulator, spin fluctuation remains and the spin-singlet d-wave SC state is realized. Present results support an unconventional spin-singlet SC state suggested by the experimental observations in layered nitrides.
- 2013-03-15
著者
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Ishihara Sumio
Department Of Applied Physics University Of Tokyo
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Watanabe Tsutomu
Department Of Applied Physics Faculty Of Engineering The University Of Tokyo
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