Stimulation of the fluctuation superconductivity by PT symmetry

We discuss fluctuations near the second-order phase transition where the free energy has an additional non-Hermitian term. The spectrum of the fluctuations changes when the odd-parity potential amplitude exceeds the critical value corresponding to the PT-symmetry breakdown in the topological structu...

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Bibliographic Details
Published in:Physical review letters 2012-10, Vol.109 (15), p.150405-150405
Main Authors: Chtchelkatchev, N M, Golubov, A A, Baturina, T I, Vinokur, V M
Format: Article
Language:English
Online Access:Get full text
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Summary:We discuss fluctuations near the second-order phase transition where the free energy has an additional non-Hermitian term. The spectrum of the fluctuations changes when the odd-parity potential amplitude exceeds the critical value corresponding to the PT-symmetry breakdown in the topological structure of the Hilbert space of the effective non-Hermitian Hamiltonian. We calculate the fluctuation contribution to the differential resistance of a superconducting weak link and find the manifestation of the PT-symmetry breaking in its temperature evolution. We successfully validate our theory by carrying out measurements of far from equilibrium transport in mesoscale-patterned superconducting wires.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.109.150405