Stimulation of the Fluctuation Superconductivity by PT Symmetry

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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.
Item Type:Article
Copyright:© 2012 American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/82260
Official URL:http://dx.doi.org/10.1103/PhysRevLett.109.150405
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