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.
- Publication:
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Physical Review Letters
- Pub Date:
- October 2012
- DOI:
- Bibcode:
- 2012PhRvL.109o0405C
- Keywords:
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- 11.30.Er;
- 03.65.Ge;
- 73.63.-b;
- Charge conjugation parity time reversal and other discrete symmetries;
- Solutions of wave equations: bound states;
- Electronic transport in nanoscale materials and structures