title: Large Tunable Thermophase in Superconductor - Quantum Dot - Superconductor Josephson Junctions.
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 thermo-phase 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 ±π/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.
authors.affiliation: Department of Physics, Ben-Gurion University of the Negev, Beer Sheva, 84105, Israel.
authors.forename: Yaakov
authors.initials: Y
authors.lastname: Kleeorin
authors.affiliation: Department of Physics, Ben-Gurion University of the Negev, Beer Sheva, 84105, Israel.|The Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer Sheva, 84105, Israel.
authors.forename: Yigal
authors.initials: Y
authors.lastname: Meir
authors.affiliation: NEST Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56127 Pisa, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Giazotto
authors.affiliation: The Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer Sheva, 84105, Israel.|Department of Chemistry, Ben-Gurion University of the Negev, Beer Sheva, 84105, Israel.
authors.forename: Yonatan
authors.initials: Y
authors.lastname: Dubi