Phase-sensitive thermoelectricity and long-range Josephson effect supported by thermal gradient
Mikhail S. Kalenkov, Pavel E. Dolgirev, Andrei D. Zaikin
Abstract
We demonstrate that a temperature gradient can strongly stimulate the thermoelectric signal, as well as dc Josephson current, in multiterminal superconducting hybrid nanostructures. At temperatures $T$ sufficiently exceeding the Thouless energy of our device, both the supercurrent and the thermoinduced voltage are dominated by the contribution from nonequilibrium low-energy quasiparticles and are predicted to decay slowly (algebraically rather than exponentially) with increasing $T$. We also predict a nontrivial current-phase relation and a transition to a $\ensuremath{\pi}$-junction state controlled by both the temperature gradient and the system topology. All these features are simultaneously observable in the same experiment.