Large thermoelectric effect in ballistic Andreev interferometers

Abstract

Employing quasiclassical theory of superconductivity combined with Keldysh technique we investigate large thermoelectric effect in multiterminal ballistic normal-superconducting (NS) hybrid structures. We argue that this effect is caused by electron-hole asymmetry generated by coherent Andreev reflection of quasiparticles at interfaces of two different superconductors with non-zero phase difference. Within our model we derive a general expression for thermoelectric voltages $V_{T1,2}$ induced in two different normal terminals exposed to a thermal gradient. Our results apply at any temperature difference in the subgap regime and allow to explicitly analyze both temperature and phase dependencies of $V_{T1,2}$ demonstrating that in general there exists no fundamental relation between these voltages and the equilibrium Josephson current in SNS junctions.

8 pages, 1 figure; published version

References in corpus (6)

• Nonlocal Thermoelectric Effects and Nonlocal Onsager Relations in a Three-Terminal Proximity-Coupled Superconductor-Ferromagnet Device
• Thermopower induced by a supercurrent in superconductor-normal-metal structures
• Theory of a large thermoeffect in superconductors doped with magnetic impurities
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• Thermopower oscillations in mesoscopic Andreev interferometers
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Cited by in corpus (3)

• Nonlocal quantum heat engines made of hybrid superconducting devices
• Phase-coherent thermoelectricity and non-equilibrium Josephson current in Andreev interferometers
• Phase-coherent thermoelectricity in superconducting hybrids (Brief Review)