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HL: Fachverband Halbleiterphysik
HL 106: Transport, magnetotransport and quantum Hall physics
HL 106.9: Vortrag
Freitag, 20. März 2015, 12:15–12:30, EW 202
Mode-selected heat flow through a one-dimensional wave- guide network — •Christian Riha1, Philipp Miechowski1, Sven S. Buchholz1, Olivio Chiatti1, Dirk Reuter2, Andreas D. Wieck3, and Saskia F. Fischer1 — 1Neue Materialien, Humboldt-Universität zu Berlin, D-10099 Berlin — 2Optoelektronische Materialien und Bauelemente, Universität Paderborn — 3Angewandte Fest- körperphysik, Ruhr-Universität Bochum, D-44780 Bochum
Cross-correlated measurements of thermal noise are performed to determine the electron temperature in nanopatterned channels of a GaAs/AlGaAs heterostructure at 4.2 K. Two-dimensional (2D) electron reservoirs are connected via an extended one-dimensional (1D) electron waveguide network. Hot electrons produced by a current Ih in a source 2D reservoir are transmitted through the ballistic 1D wave- guide and relax in a drain 2D reservoir. We find that the electron temperature increase ΔTe in the drain is proportional to the square of the heating current Ih, as expected from Joule’s law. We find that electron-phonon interaction is negligible for heat transport between 2D reservoirs at temperatures below 4.2 K. Furthermore, we demonstrate mode control of heat flow in the 1D electron waveguide by a top-gatevoltage [1].
[1] Riha et al., arXiv:1410.2831