Effects of Disorder on Superfluidity in the Attractive Hubbard Model
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概要
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We study the effects of disorder on an s-wave superfluid in the attractive Hubbard model using statistical dynamical mean-field theory, which enables us to treat both the correlation effects and the spatial nonuniformity due to disorder in the same framework. The distribution functions of the local density of states and the superfluid order parameter are obtained. From the geometrical average of these quantities, which characterizes the order parameters in disordered systems, we determine the ground-state phase diagram of the attractive Hubbard model with disorder at half-filling and zero temperature. We discuss the superfluid-localization transition and the crossover behavior within the localized phase.
- 2013-07-15
著者
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Kawakami Norio
Department Of Applied Physics Osaka University
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Sakaida Masaru
Department of Physics, Kyoto University, Kyoto 606-8502, Japan
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Noda Kazuto
Department of Physics, Kyoto University, Kyoto 606-8502, Japan
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