Crossover from BCS to local pair superconductivity in two dimension

✍ Scribed by Akio Tokumitu; Kazumasa Miyake

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 192 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)92404-x

✦ Synopsis

Crossover from Cooper pair condensation to Bose-Einstein condensation of tightly bound pairs is considered in 2D attractively interacting fermion systems, i.e., a continuum model adopted by Nozi~res-Schmitt-Rink and the attractive Hubbard model. The transition temp::rature is determined in the Kosterlitz-Thouless formalism by using the relation N,(TKT) = (2m/~r)TKw with the superfluid density NdT) evaluated from the transverse current respense as in the conventional method, in which however the self-consistent solutions of the gap and the chemical potential are used. This gives the smooth crossover both for the transition temperature and the chemical potential.