Low Temperature Physics: 38, 349 (2012); https://doi.org/10.1063/1.3697970 (4 pages)
Superconducting phase-dependent force in SNS junctions with a movable scatterer
A.V. Parafilo1, I.V. Krive1,2,3, E.N. Bogachek4, and U. Landman4
1 B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
2 Department of Physics, University of Gothenburg, SE-412 96 Göteborg, Sweden
3 Physical Department, V.N. Karazin National University, Kharkov 61077, Ukraine
4 School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA
Received December 2, 2011
We calculate a quantum (Casimir-like) superconducting phase-dependent force acting on a movable scatterer in a superconductor–normal metal–superconductor (SNS) junction. Repulsive Casimir forces are predicted for a short SNS junction with nonequilibrium (inverse) populations of Andreev levels. In a long SNS junction an anomalous (nonmonotonic) temperature behavior of quantum force is found.
PACS: 74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions;
Key words: Casimir effect, SNS junction.