Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 75: Quantum Dots: Transport Properties II

HL 75.2: Vortrag

Donnerstag, 23. März 2017, 15:15–15:30, POT 151

Thermal energy and charge currents in multi-terminal nanorings — •Christian Riha1, Tobias Kramer1,2, Christoph Kreisbeck1, Olivio Chiatti1, Sven S. Buchholz1, Andreas D. Wieck3, Dirk Reuter4, and Saskia F. Fischer11Novel Materials Group, Humboldt-Universität zu Berlin, D-12489 Berlin — 2Zuse-Institut für Informationstechnik, D-14195 Berlin — 3Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum — 4Optoelektronische Materialien und Bauelemente, Universität Paderborn, D-33098 Paderborn

We study thermal energy and charge transfer close to the quantum limit in a ballistic nanodevice experimentally [1] and theoretically [2]. The device consists of multiply connected one-dimensional electron waveguides and is based on an AlGaAs/GaAs heterostructure. A global top-gate steers the thermal energy and charge transfer in the presence of a temperature gradient, which is established by a heating current. Thermal noise measurements allow to estimate the heat transfer and shows the device to act as a switch for charge and thermal energy transfer. Wave-packet simulations, that are based on the multi-terminal Landauer-Büttiker approach, confirm the experimental finding of a mode-dependent redistribution of the thermal energy current, if a scatterer breaks the device symmetry.

[1] C. Riha et al., Appl. Phys. Lett. 106, 083102 (2015)

[2] T. Kramer et al., AIP Advances 6, 065306 (2016)

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