Quantum phase in nanoscopic superconductors

Gedik, Zafer (2003) Quantum phase in nanoscopic superconductors. Journal of superconductivity, 16 (6). pp. 913-917. ISSN 0896-1107 (Print) 1572-9605 (Online)

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Official URL: http://dx.doi.org/10.1023/A:1026287517675


Using the pseudospin representation and the SU(2) phase operators we introduce a complex parameter to characterize both infinite and finite superconducting systems.While in the bulk limit the parameter becomes identical to the conventional order parameter, in the nanoscopic limit its modulus reduces to the number parity effect parameter and its phase takes discrete values. We evaluate the Josephson coupling energy and show that in bulk superconductor it reproduces the conventional expression and in the nanoscopic limit it leads to quantized Josephson effect. Finally, we study the phase flow or dual Josephson effect in a superconductor with fixed number of electrons.

Item Type:Article
Uncontrolled Keywords:mesoscopic superconductivity; order parameter; Josephson effect; quantum phase
Subjects:Q Science > QC Physics
ID Code:172
Deposited By:Zafer Gedik
Deposited On:18 Dec 2006 02:00
Last Modified:04 Sep 2019 16:21

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