Stimulation of the Fluctuation Superconductivity by PT Symmetry


Chtchelkatchev, N.M. and Golubov, A. and Baturina, T.I. and Vinokur, V.M. (2012) Stimulation of the Fluctuation Superconductivity by PT Symmetry. Physical review letters, 109 (15). 150405 - . ISSN 0031-9007

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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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Copyright:© 2012 American Physical Society
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Metis ID: 289233