Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 1
TT 14.4: Talk
Monday, March 20, 2017, 15:45–16:00, HSZ 201
Thermoelectrical effects in hybrid superconducting Josephson junctions — •Alessandro Braggio1,2,3, Riccardo Bosisio1, Paolo Solinas2, Sebastian Bergeret4, and Francesco Giazotto1 — 1NEST, Istituto Nanoscienze-CNR, Piazza S. Silvestro 12, Pisa I-56127, Italy — 2SPIN-CNR, Via Dodecaneso 33, 16146 Genova, Italy — 3INFN, Sez. Genova, Via Dodecaneso 33, 16146 Genova, Italy — 4Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, Manuel de Lardizabal 4, E-20018 San Sebastián, Spain
We present an exhaustive theoretical analysis of charge and thermoelectric transport in a normal metal-ferromagnetic insulator-superconductor (NFIS) junction, and explore the possibility of its use as a sensitive thermometer. We evaluate the noise performance of open-circuit and closed-circuit setups. We show that temperature noise can be as low as 35nK Hz−1/2[1]. In the second part we discuss the photon-mediated heat flow between two Josephson-coupled Bardeen-Cooper-Schrieffer (BCS) superconductors. We demonstrate that in standard low temperature experiments involving temperature-biased superconducting quantum interference devices (SQUIDs), this radiative contribution is negligible if compared to the direct galvanic one, but it largely exceeds the heat exchanged between electrons and the lattice phonons[2].
[1] F. Giazotto, P. Solinas, A. Braggio and F. S. Bergeret, Phys. Rev. Appl. 4, 044016 (2015)
[2] R. Bosisio, P. Solinas, A. Braggio and F. Giazotto, Phys. Rev. B 93, 144512 (2016)