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Cross thermoelectric coupling in normal-superconductor quantum dots

AuthorsHwang, Sun-Yong; López, Rosa ; Sánchez, David
Issue Date23-Mar-2015
PublisherAmerican Physical Society
CitationPhysical Review - Section B - Condensed Matter 91(10): 104518 (2015)
AbstractWe discuss the nonlinear current of an interacting quantum dot coupled to normal and superconducting reservoirs with applied voltage and temperature differences. Due to the particle-hole symmetry introduced by the superconducting lead, the pure (subgap) thermoelectric response vanishes. However, we show that the Andreev bound states shift as the thermal gradient increases. As a consequence, the I−V characteristic can be tuned with a temperature bias if the system is simultaneously voltage biased. This is a cross effect that occurs beyond linear response only. Furthermore, we emphasize the role of quasiparticle tunneling processes in the generation of high thermopower sensitivities.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.91.104518
Identifiersissn: 0163-1829
Appears in Collections:(IFISC) Artículos
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