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HL: Fachverband Halbleiterphysik

HL 46: Quantum Dots and Wires: Transport

HL 46.1: Vortrag

Mittwoch, 24. März 2010, 14:00–14:15, H17

Study of two-Kondo impurities coupled via an open conducting reservoir — •Daniel Tutuc¹, Werner Wegscheider², and Rolf J. Haug¹ — ¹Institut für Feskörperphysik, Leibniz Universität Hannover, D-30167 Hannover — ²Angewandte und Experimentelle Physik, Universität Regensburg, D-93040 Regensburg

We present measurements on a structure consisting of two quantum dots connected via an open conducting region, in Kondo regime. The sample is created by Local Anodic Oxidation with an AFM on a GaAs/AlGaAs heterostructure with a 2DEG 37nm beneath the surface. The measurements have been performed with the standard lock-in technique, in a dilution refrigerator, at about 200 mK electron temperature. At finite magnetic fields both dots exibit the so-called Kondo chessboard pattern and we investigate the effective interaction between the dots as a function of edge states direction and tunnel coupling to the central region.

[1] N. J. Craig et al., Science 304, 565 (2004)

[2] P. Simon, et al., Phys. Rev. Lett. 94, 086602 (2005)

[3] M. G. Vavilov and L. I. Glazman, Phys. Rev. Lett. 94, 086805 (2005)