Garcia-Garcia, Antonio M. and Urbina, Juan Diego and Yuzbashyan, Emil A. and Richter, Klaus and Altshuler, Boris L. (2008) Bardeen-Cooper-Schrieffer theory of finite-size superconducting metallic grains. PHYSICAL REVIEW LETTERS, 100 (18): 187001. ISSN 0031-9007,
Full text not available from this repository.Abstract
We study finite-size effects in superconducting metallic grains and determine the BCS order parameter and the low energy excitation spectrum in terms of the size and shape of the grain. Our approach combines the BCS self-consistency condition, a semiclassical expansion for the spectral density and interaction matrix elements, and corrections to the BCS mean field. In chaotic grains mesoscopic fluctuations of the matrix elements lead to a smooth dependence of the order parameter on the excitation energy. In the integrable case we observe shell effects when, e.g., a small change in the electron number leads to large changes in the energy gap.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PARTICLES; STATISTICS; PARITY; LIMIT; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 Nov 2020 06:24 |
| Last Modified: | 03 Nov 2020 06:24 |
| URI: | https://pred.uni-regensburg.de/id/eprint/30906 |
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