title: Stimulation of the fluctuation superconductivity by PT symmetry.
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.
authors.affiliation: Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk 142190, Moscow region, Russia.
authors.forename: N M
authors.initials: NM
authors.lastname: Chtchelkatchev
authors.forename: A A
authors.initials: AA
authors.lastname: Golubov
authors.forename: T I
authors.initials: TI
authors.lastname: Baturina
authors.forename: V M
authors.initials: VM
authors.lastname: Vinokur