Possible Appearance of Superconductivity on Si(001) Surface

Inspired by Kondo et al. 's experiment, [Kondo] which reports that the p (2×1) symmetric dimer phase is stable at low temperatures on a Si(001) surface, a two-leg ladder Hubbard model with three Fermi surfaces, which is an effective model of the Si(001) surface, is studied theoretically. The fluctuation-exchange (FLEX) method is adopted to take the effects of on-site Coulomb interactions into account. The electronic structures are discussed and an unconventional even-parity superconductivity through large antiferromagnetic spin fluctuations is found for a wide range of doping. Other possible electronic states with large superconducting fluctuations are also discussed.

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