|
Title
|
|
|
|
Ultra-small metallic grains : effect of statistical fluctuations of the chemical potential on superconducting correlations and vice versa
|
|
|
Author
|
|
|
|
|
|
|
Abstract
|
|
|
|
| Superconducting correlations in an isolated metallic grain are governed by the interplay between two energy scales: the mean level spacing delta and the bulk pairing gap Delta(0), which are strongly influenced by the position of the chemical potential with respect to the closest single-electron level. In turn superconducting correlations affect the position of the chemical potential. Within the parity projected BCS model we investigate the probability distribution of the chemical potential in a superconducting grain with randomly distributed single-electron levels. Taking into account statistical fluctuations of the chemical potential due to the pairing interaction, we find that such fluctuations have a significant impact on the critical level spacing delta(c) at which the superconducting correlations cease: the critical ratio delta(c)/Delta(0) at which superconductivity disappears is found to be increased. |
|
|
|
Language
|
|
|
|
English
|
|
|
Source (journal)
|
|
|
|
Journal of physics : condensed matter. - London
|
|
|
Publication
|
|
|
|
London
:
2012
|
|
|
ISSN
|
|
|
|
0953-8984
|
|
|
DOI
|
|
|
|
10.1088/0953-8984/24/27/275701
|
|
|
Volume/pages
|
|
|
|
24
:27
(2012)
, 8 p.
|
|
|
Article Reference
|
|
|
|
275701
|
|
|
ISI
|
|
|
|
000305653100012
|
|
|
Medium
|
|
|
|
E-only publicatie
|
|
|
Full text (Publisher's DOI)
|
|
|
|
|
|
|
Full text (publisher's version - intranet only)
|
|
|
|
|
|