The BCS Pairing Instability in the Thermodynamic Limit

Details The BCS Pairing Instability in the Thermodynamic Limit The BCS Pairing Instability in the Thermodynamic Limit

2012-03-22

arxiv.org/abs/1203.5122v1

Physics

Condensed Matter

Superconductivity

4 pages + references, 4 figures

Scientific paper

The superconducting pairing instability---as determined by a divergence of the two-particle susceptibility---is obtained in the mean field (BCS) approximation in the thermodynamic limit. The usual practice is to examine this property for a finite lattice. We illustrate that, while the conclusions remain unchanged, the technical features are very different in the thermodynamic limit and conform more closely with the usual treatment of phase transitions encountered in, for example, the mean-field paramagnetic-ferromagnetic transition. Furthermore, by going to the extreme dilute limit, one can distinguish three dimensions from one and two dimensions, in which a pairing instability occurs even for two particles.

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