Interplay between pairing and exchange in small metallic dots

被引：11
|
作者：
Falci, G
Fazio, R
Mastellone, A
机构：
[1] Univ Catania, Dipartimento Metodol Fis & Chim, INFM, UdR Catania, I-95125 Catania, Italy
[2] Scuola Normale Super Pisa, INFM, UdR Pisa, I-56126 Pisa, Italy
[3] Natl Enterprise Nanosci & Nanotechnol, NEST, INFM, Pisa, Italy
来源：
PHYSICAL REVIEW B | 2003年 / 67卷 / 13期
关键词：
D O I：
10.1103/PhysRevB.67.132501
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study the effects of the mesoscopic fluctuations on the competition between exchange and pairing interactions in ultrasmall metallic dots when the mean level spacing delta is comparable or larger than the BCS pairing energy Delta. Due to mesoscopic fluctuations, the probability to have a nonzero spin ground state may be nonvanishing, and shows universal features related to both level statistics and interaction. Sample-to-sample fluctuations of the renormalized pairing are highlighted.
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页数：4
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