Phase of biparticle localized states for the Cooper problem in two-dimensional disordered systems - art. no. 094502

Authors
Lages, J Shepelyansky, DL
Citation
J. Lages et Dl. Shepelyansky, Phase of biparticle localized states for the Cooper problem in two-dimensional disordered systems - art. no. 094502, PHYS REV B, 6409(9), 2001, pp. 4502
Citations number
26
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6409
Issue
9
Year of publication
2001
Database
ISI
SICI code
0163-1829(20010901)6409:9<4502:POBLSF>2.0.ZU;2-5
Abstract
The Cooper problem is studied numerically for the Anderson model with disor der in two dimensions. It is shown that the attractive Hubbard interaction creates a phase of biparticle localized states in the regime where noninter acting states are delocalized. This phase cannot be obtained in the mean-fi eld approximation and the pair coupling energy is strongly enhanced in this regime. The effects of magnetic field are studied and it is shown that und er certain conditions they lead to delocalization.