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

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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 · Physical Review Letters

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PtSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown