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Quantum Phase Transition in Extended Attractive Hubbard Model

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arxiv cond-mat/0002288 v2 pith:3KGDLSGK submitted 2000-02-18 cond-mat.supr-con cond-mat.str-el

Quantum Phase Transition in Extended Attractive Hubbard Model

S. Saito , H. Yoshimoto , Y. Y. Suzuki , S. Kurihara This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords transitionphasequantumattractivechargedensityfoundsuperconductivity
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have made a variational analysis on an evolution of superconductivity from weak to strong coupling regime. In contrast to a crossover without thermodynamic anomaly found in a dilute system, we show the existence of a quantum phase transition near half filling. The transition is driven by charge density waves instabilities. We have found that superconductivity and charge density waves coexist in the presence of a weak intersite repulsion. The ground state phase diagram is determined and the quantum phase transition is an attractive version of the Mott transition.

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