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.
Original language | English |
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Article number | 150405 |
Number of pages | 5 |
Journal | Physical review letters |
Volume | 109 |
Issue number | 15 |
DOIs | |
Publication status | Published - 2012 |
Keywords
- METIS-289233
- IR-82260