From semiconductors to superconductors: a simple model for pseudogaps

Details From semiconductors to superconductors: a simple model for pseudogaps From semiconductors to superconductors: a simple model for pseudogaps

1999-02-19

arxiv.org/abs/cond-mat/9902273v1

Eur. Phys. J. B 10, pp. 649-662 (1999)

Physics

Condensed Matter

Superconductivity

14 pages. Accepted for publication on Eur. Phys. Jour. B

Scientific paper

10.1007/s100510050897

We consider a two dimensional semiconductor with a local attraction among the carriers. We study the ground state of this system as a function of the semiconductor gap. We find a direct transition from a superconducting to an insulating phase for no doping at a critical value, the single particle excitations being always gapped. For finite doping we find a smooth crossover. We calculate the critical temperature due to both the particle excitations and the Berezinkii-Kosterlitz-Thouless transition.

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