Regensburg 2019 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 24: Spintronics (joint session TT/DY/MA)
DY 24.3: Vortrag
Dienstag, 2. April 2019, 14:30–14:45, H23
Quasiparticle cooling using a Topological insulator-Superconductor hybrid junction — •D. Bercioux1,2 and P. Lucignano3,4 — 1Donostia International Physics Center, Paseo Manuel de Lardizbal 4, E-20018 San Sebastián, Spain — 2IKERBASQUE, Basque Foundation of Science, 48011 Bilbao, Spain — 3CNR-SPIN, Monte S.Angelo, via Cinthia, I-80126 Napoli, Italy — 4Dipartimento di Fisica “E. Pancini”, Universitá di Napoli “Federico II", Monte S.Angelo, I-80126 Napoli, Italy
We investigate the thermoelectric properties of a hybrid junction realised coupling surface states of a three-dimensional topological insulator with a conventional s-wave superconductor.
We focus on the ballistic devices and study the quasiparticle flow, carrying both electric and thermal currents, adopting a scattering matrix approach based on conventional Blonder-Tinkham-Klapwijk formalism [1].
We calculate the cooling efficiency of the junction as a function of the microscopic parameters of the normal region (i.e. the chemical potential etc.).
The cooling power increases when moving from a regime of Andreev specular-reflection to a regime where Andreev retro-reflection dominates. Differently from the case of a conventional N/S interface [2], we can achieve efficient cooling of the normal region, without including any explicit impurity scattering at the interface, to increase normal reflection [3].
[1] Blonder, Tinkham & Klapwijk, Phys. Rev. B 25, 4515 (1982).
[2] Bardas & Averin, Phys. Rev. B 52, 12873 (1995).
[3] Bercioux & Lucignano, arXiv:1804.07170, EPJ ST, in press (2018).