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HL: Fachverband Halbleiterphysik

HL 23: Quantum dots and wires: Transport properties I

HL 23.2: Talk

Tuesday, February 26, 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.