Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 53: Topology: Majorana Physics

TT 53.12: Vortrag

Donnerstag, 19. März 2020, 12:30–12:45, HSZ 103

On-demand thermoelectric generation of equal-spin Cooper pairsFelix Keidel1, •Sun-Yong Hwang2, Björn Trauzettel1,3, Björn Sothmann2, and Pablo Burset41Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074 Würzburg, Germany — 2Theoretische Physik, Universität Duisburg-Essen and CENIDE, D-47048 Duisburg, Germany — 3Würzburg-Dresden Cluster of Excellence ct.qmat, Germany — 4Department of Applied Physics, Aalto University, 00076 Aalto, Finland

Superconducting spintronics is based on the creation of spin-triplet Cooper pairs in ferromagnet-superconductor (F-S) hybrid junctions. Manipulation of spin-polarized supercurrents typically requires the ability to carefully control magnetic materials. We here propose a quantum heat engine that generates equal-spin Cooper pairs and drives supercurrents on-demand without manipulating magnetic components. Our proposal is based on a S-F-S junction, connecting two leads at different temperatures, on top of the helical edge of a two-dimensional topological insulator. Remarkably, only crossed Andreev reflections contribute to the charge current while electron cotunneling is responsible for the heat flow to the cold lead. Such a purely nonlocal Andreev thermoelectric effect injects spin-polarized Cooper pairs at the superconductors producing a supercurrent that can be switched on/off by tuning their relative phase.

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