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# Title: Quasiparticle cooling using a Topological insulator-Superconductor hybrid junction

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.
 Comments: 9 pages, 5 figures Subjects: Superconductivity (cond-mat.supr-con); Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Cite as: arXiv:1804.07170 [cond-mat.supr-con] (or arXiv:1804.07170v1 [cond-mat.supr-con] for this version)

## Submission history

From: Dario Bercioux [view email]
[v1] Thu, 19 Apr 2018 13:51:47 GMT (738kb,D)
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