Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 48: Poster 2
HL 48.46: Poster
Donnerstag, 26. März 2009, 15:00–17:30, P2
SAW driven ratchet-like effects in AlGaAs/GaAs nanostructures — •Marcin Malecha1, Jens Ebbecke2, Hubert J. Krenner1, and Achim Wixforth1,3 — 1Institut für Physik, Universität Augsburg, 86135 Augsburg — 2Heriot-Watt University, School of EPS-Physics, EH14 4AS, Edinburgh — 3Center for NanoScience (CeNS), Geschwister-Scholl-Platz 1, 80539 München
Recently we have reported our results [1] on electron transport through strong coupled quantum dots on AlGaAs/GaAs heterostructures. The major feature is a strong Coulomb interaction which leads to broken electron-hole symmetry. Due to the designed lateral asymmetry of the quantum dots and applied surface acoustic waves for driving electrons the whole system is highly non-symmetric and thus ratchet effects are expected. The experimental data clearly shows one of the most prominent ratchet effects - the current reversal - when a SAW is applied. For further investigations, a new sample design is developed where more parameters can be tuned separately - from the height of the barriers to the shape and coupling strength of the quantum dots. Details of the new sample design and first measurements will be presented.
[1] F.J. Kaiser, et al, J. Phys.: Condens. Matter 20, 374108 (2008)