Phase-coherent thermoelectricity and nonequilibrium Josephson current in Andreev interferometers
Mikhail S. Kalenkov, Andrei D. Zaikin
DOI 10.1103/PhysRevB.103.134501 · Physical Review B
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Abstract
We develop a detailed theory describing a nontrivial interplay between nonequilibrium effects and long-range quantum coherence in superconducting hybrid nanostructures exposed to a temperature gradient. We establish a direct relation between thermoelectric and Josephson effects in such structures and demonstrate that at temperatures exceeding the Thouless energy of our device both phase-coherent thermoelectric signal and the supercurrent may be strongly enhanced due to nonequilibrium low-energy quasiparticles propagating across the system without any significant phase relaxation. By applying a temperature gradient, one can drive the system into a well-pronounced π-junction state, thereby creating novel opportunities for applications of Andreev interferometers.
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