Ihra, Wolfgang and Richter, Klaus (2001) Non-universal features in the quasi-particle excitation spectra of Andreev billiards and wires. Physica E 9 (3), pp. 362-368.
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We study non-universal features of the quasi- particle excitation spectra of normal-conducting mesoscopic structures, whose classical dynamics are chaotic, and which are coupled to a superconducting lead. In the first part we demonstrate the importance of non-universal contributions in Andreev billiards when the ergodic time of the billiard is of the same order as the mean escape time. Non-universality introduces additional oscillations in the quasi- particle excitation spectrum which are related to the decaying modes of the classical evolution operator in the closed billiard. In the second part we demonstrate that in a long rough wire coupled to a superconductor classical anomalous diffusion modifies the energy scale below which universality holds as a function of the geometrical parameters in comparison to billiards with a narrow superconducting lead.
|Institutions:||Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter|
|Keywords:||Mesoscopic superconductivity; Hybrid structures; Andreev reflection|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||20 Mar 2007|
|Last Modified:||20 Jul 2011 20:57|