Quantum Phase Transition in Extended Attractive Hubbard Model

Details Quantum Phase Transition in Extended Attractive Hubbard Model Quantum Phase Transition in Extended Attractive Hubbard Model

2000-02-18

arxiv.org/abs/cond-mat/0002288v2

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

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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