SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 60: Quantum Dots, Quantum Wires, Point Contacts

TT 60.3: Vortrag

Donnerstag, 30. März 2023, 17:45–18:00, HSZ 03

Modifications of the local dissipation profile imposed by quantum point contacts — •Nico Leumer — Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France

Recent experimental progress provides access to local temperature changes on the nanoscale, three orders of magnitude lower than the sample temperature itself [1]. Since electric current is accompanied by an energy loss of the charge carriers, this advance implies that the dissipated power became in fact a local observable. The key role is adopted by electron-phonon interactions transferring the electronic energy loss to the bulk material and thus; stimulating the sample temperature profile.

Quantum point contacts (QPC) have been reported to modify the dissipation and, especially, the energy loss of charge carriers may be distributed asymmetrically around the QPC. Inspired by this feature, we develop a theory to determine why, where and how much dissipation occurs in experimental relevant geometries.
[1] D. Halbertal et al., Nature 539, 407 (2016)
[2] C. Blaas-Anselmi et al., SciPost Phys. 12, 105 (2022)