Universität zu Köln

Bagrets, Dmitry and Levchenko, Alex ORCID: 0000-0002-0319-386X (2014). Nonequilibrium noise and current fluctuations at the superconducting phase transition. Phys. Rev. B, 90 (18). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1550-235X

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Abstract

We study non-Gaussian out-of-equilibrium current fluctuations in a mesoscopic NSN circuit at the point of a superconducting phase transition. The setup consists of a voltage-biased thin film nanobridge superconductor (S) connected to two normal-metal (N) leads by tunnel junctions. We find that, above a critical temperature, fluctuations of the superconducting order parameter associated with the preformed Cooper pairs mediate inelastic electron scattering that promotes strong current fluctuations. Though the conductance is suppressed due to the depletion of the quasiparticle density of states, higher cumulants of current fluctuations are parametrically enhanced. We identify an experimentally relevant transport regime where excess current noise may reach or even exceed the level of thermal noise.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bagrets, Dmitry UNSPECIFIED UNSPECIFIED UNSPECIFIED Levchenko, Alex UNSPECIFIED orcid.org/0000-0002-0319-386X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-423044
DOI:	10.1103/PhysRevB.90.180505
Journal or Publication Title:	Phys. Rev. B
Volume:	90
Number:	18
Date:	2014
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1550-235X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GINZBURG-LANDAU EQUATIONS; NONLINEAR SIGMA-MODEL; DISORDERED SUPERCONDUCTORS; COUNTING STATISTICS; TC; ELECTRONS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42304