Stimulation of the fluctuation superconductivity by the PT-symmetry
N. M. Chtchelkatchev, A. A. Golubov, T. I. Baturina, and V. M. Vinokur
TL;DR
This paper explores how PT-symmetry breaking influences fluctuation superconductivity, revealing changes in fluctuation spectra and resistance behavior near phase transitions, validated through experiments on mesoscale superconducting wires.
Contribution
It introduces a theoretical framework linking PT-symmetry breaking to fluctuation effects in superconductors and confirms predictions with experimental measurements.
Findings
Fluctuation spectrum changes at PT-symmetry breakdown.
Manifestation of PT-symmetry breaking in resistance-temperature relation.
Experimental validation through transport measurements in superconducting wires.
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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