Quantum Phase Transition in Extended Attractive Hubbard Model

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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.
4 pages, 5 figures

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Superconductivity, Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/16058

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0002288
 http://arxiv.org/abs/cond-mat/0002288

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arXiv