Abstract
In this work, 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. 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, we can achieve efficient cooling of the normal region, without including any explicit impurity scattering at the interface, to increase normal reflection.
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Bercioux, D., Lucignano, P. Quasiparticle cooling using a topological insulator–superconductor hybrid junction. Eur. Phys. J. Spec. Top. 227, 1361–1375 (2018). https://doi.org/10.1140/epjst/e2018-00069-3
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DOI: https://doi.org/10.1140/epjst/e2018-00069-3