Quantum Phase Transition in Extended Attractive Hubbard Model
Superconductivity
2007-05-23 v2 Strongly Correlated Electrons
Abstract
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.
Cite
@article{arxiv.cond-mat/0002288,
title = {Quantum Phase Transition in Extended Attractive Hubbard Model},
author = {S. Saito and H. Yoshimoto and Y. Y. Suzuki and S. Kurihara},
journal= {arXiv preprint arXiv:cond-mat/0002288},
year = {2007}
}
Comments
4 pages, 5 figures