Stimulation of the Fluctuation Superconductivity by PT Symmetry

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

doi:10.1103/PhysRevLett.109.150405

Stimulation of the Fluctuation Superconductivity by PT Symmetry

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

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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 language	English
Article number	150405
Number of pages	5
Journal	Physical review letters
Volume	109
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.109.150405
Publication status	Published - 2012

Keywords

METIS-289233
IR-82260

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Chtchelkatchev2012stimulationFinal published version, 566 KB

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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.",

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AB - 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.

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Stimulation of the Fluctuation Superconductivity by PT Symmetry

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