Large Tunable Thermophase in Superconductor Quantum Dot Superconductor Josephson Junctions

by Yaakov Kleeorin

at Condensed Matter Theory Seminar

Wed, 25 May 2016, 13:30
Physics building (#54) room 207

Abstract

In spite of extended efforts detecting thermoelectric effects in superconductors has proven to be a challenging task due to the inherent superconducting particle hole symmetry Here we present a theoretical study of an experimentally attainable Superconductor Quantum Dot Superconductor SC QD SC Josephson Junction Using Keldysh Green s functions we derive the exact thermophase and thermal response of the junction and demonstrate that such a junction has highly tunable thermoelectric properties and a significant thermal response The origin of these effects is the QD energy level placed between the SCs which breaks particle hole symmetry in a gradual manner allowing in the presence of a temperature gradient for gate controlled appearance of a superconducting thermo phase This thermo phase increases up to a maximal value of 2 after which thermovoltage is expected to develop Our calculations are performed in realistic parameter regimes and we suggest an experimental setup which could be used to verify our predictions

Created on 22-05-2016 by Bar Lev, Yevgeny (ybarlev)
Updaded on 22-05-2016 by Bar Lev, Yevgeny (ybarlev)