Low Temperature Physics: 38, 349 (2012); https://doi.org/10.1063/1.3697970 (4 pages)
Физика Низких Температур: Том 38, Выпуск 4 (Апрель 2012), c. 446-450    ( к оглавлению , назад )

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
E-mail: parafilo_sand@mail.ru

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;
PACS: 03.70.+k Theory of quantized fields.

Ключевые слова: Casimir effect, SNS junction.