Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 60: III-V Semiconductors (no Nitrides)
HL 60.3: Vortrag
Mittwoch, 9. März 2016, 15:15–15:30, H13
Heat flow and noise measurements in etched semiconductor quantum wire structures — •Christian Riha1, Olivio Chiatti1, Sven S. Buchholz1, Christoph Kreisbeck1, Dirk Reuter2, Andreas D. Wieck3, Tobias Kramer4, and Saskia F. Fischer1 — 1Novel Materials Group, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 2Optoelektronische Materialien und Bauelemente, Universität Paderborn, 33098 Paderborn, Germany — 3Angewandte Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany — 4Konrad-Zuse Zentrum für Informationstechnik Berlin, 14195 Berlin, Germany
Low-dimensional transport in semiconductor meso- and nanostructures is a topical field of fundamental research with potential applications in future quantum devices. However, thermal non-equilibrium may destroy phase-coherence and remains to be explored experimentally. In
the limit of non-interacting charge carriers the heat and charge transport are coupled, as given by the Wiedemann-Franz relation between the electrical and thermal conductivity. Here, we present effects of thermal
non-equilibrium in narrow quasi-two-dimensional (2D) channels, quasi-one-dimensional (1D) waveguide networks, quantum rings (QRs) and single 1D constrictions such as quantum point contacts (QPCs) using current heating and noise thermometry [1]. Therefrom, we determine and discuss electron-energy loss rates, electron-phonon interaction and heat transport processes.
C. Riha et al., Appl. Phys. Lett. 106, 083102 (2015);