Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 23: Quantum dots and wires: Transport properties I
HL 23.2: Vortrag
Dienstag, 26. Februar 2008, 11:15–11:30, EW 201
Controlling electrons in InAs-nanowire quantum dots — •Marc Scheffler1, Stevan Nadj-Perge1, Leo P. Kouwenhoven1, Magnus T. Borgström2, Rienk Algra2, and Erik P.A.M. Bakkers2 — 1Kavli Institute of Nanoscience Delft, Delft, The Netherlands — 2Philips Research Laboratories, Eindhoven, The Netherlands
Quantum dots are an established technique to trap and control electrons in a solid; in particular towards the long-term perspective of quantum computation. Here we show how tunable quantum dots can be created in InAs nanowires by local gating, with the final goal of spin manipulation. While we can observe the influence of the electron spin already in a single quantum dot, the case of a double quantum dot is even more interesting: adjusting the coupling between the two dots, we present the different stability diagrams from independent to strongly coupled dots. In the interacting regime the electron spin plays an important role that can govern the transport through the double dot and thus allows for direct observation of the spin state in the dot.