Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 30: Poster: Quantum dots and wires: Preparation, characterization, optical properties and transport

HL 30.9: Poster

Montag, 31. März 2014, 17:00–20:00, P2

Thermal noise in AlGaAs/GaAs-nanostructures — •Christian Riha1, Philipp Miechowski1, Sven S. Buchholz1, Olivio Chiatti1, Dirk Reuter2, Andreas D. Wieck3, and Saskia F. Fischer11Neue Materialien, Humboldt-Universität zu Berlin, D-10099 Berlin — 2Optoelektronische Materialien und Bauelemente, Universität Paderborn, D-33098 Paderborn — 3Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum

Transport properties of low-dimensional mesoscopic systems strongly differ from those of bulk materials. When the width of a conducting channel has the scale of the Fermi wavelength, these properties are dominated by the electron's wave characteristics and the channel is referred to as electronic waveguide. We investigate the heat transport through a one-dimensional quantum-wire ring structure fabricated from a AlGaAs/GaAs heterostructure in the presence of an electron temperature gradient at 4.2 K. The temperature gradient is established by the current heating technique. The experimental setup [1] enables the measurement of the Johnson noise and thus the detection of a change in the electron temperature. A global top-gate allows the change of the waveguide's conductance. We present and discuss the results of the heat transport in dependence of the participating one-dimensional transport modes.

[1] S. S. Buchholz, et al, Phys. Rev. B 85, 225301 (2012)

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