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HL: Fachverband Halbleiterphysik
HL 88: Quantum Dots and Wires: Transport Properties IV (mainly Double Dots and Point Contacts)
HL 88.3: Talk
Thursday, March 29, 2012, 17:00–17:15, EW 202
Magnetotransport in single and double quantum dots in the Kondo regime — •Alexander W. Heine, Daniel Tutuc, and Rolf J. Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, D-30167 Hannover, Germany
We analyse the magnetotransport of quantum dots (QD) in the Kondo regime. The sample consists of two lateral QDs produced by local anodic oxidation on a GaAs/AlGaAs heterostructure, containing a two-dimensional electron system (2DES) 37 nm below the surface. Transport measurements on each single QD, and both QDs in parallel respectively, are performed in a 3He/4He dilution refrigerator with a base temperature of 20 mK, using standard lock-in technique. The QDs are separately tuned by six sidegates into the Kondo regime. A magnetic field applied perpendicular to the 2DES gives rise to the so-called Kondo chessboard. We investigate the QDs’ non-linear transport properties in fields up to 5 T, as well as the temperature dependence of the linear conductance.