Stimulation of the Fluctuation Superconductivity by PT Symmetry

N.M. Chtchelkatchev, A.A. Golubov, T.I. Baturina, V.M. Vinokur

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67 Citations (Scopus)
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Abstract

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.
Original languageEnglish
Article number150405
Number of pages5
JournalPhysical review letters
Volume109
Issue number15
DOIs
Publication statusPublished - 2012

Keywords

  • METIS-289233
  • IR-82260

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