Phase-coherent thermoelectricity in superconducting hybrids (Mini-review)
M. S. Kalenkov+, A. D. Zaikin*+
+I. E. Tamm Department of Theoretical Physics, P. N. Lebedev Physical Institute, 119991 Moscow, Russia
*Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany
We review some recent advances in studies of phase-coherent
thermoelectric effects in superconducting hybrid structures such as,
e.g., Andreev interferometers. We elucidate a number of mechanisms of
electron-hole symmetry breaking in such systems causing dramatic
enhancement of thermoelectric effects. We demonstrate that the flux-dependent
thermopower exhibits periodic dependence on the applied
magnetic flux Φx which in some limits may reduce to either odd or
even functions of Φx in accordance with experimental observations.
We also show that dc Josephson current in Andreev interferometers can be
controlled and enhanced by applying a temperature gradient which may also
cause a nontrivial current-phase relation and a transition to a π-junction state.