Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 16: Poster Ia

HL 16.14: Poster

Freitag, 4. März 2005, 16:30–19:00, Poster TU E

Weak anti-localization in InGaAs/InP quantum wires — •Vitaliy A. Guzenko, Thomas Schäpers, and Jens Knobbe — Institute of Thin Films and Interfaces (ISG1) and CNI - Center of Nanoelectronic Systems for Information Technology, Research Centre Jülich, 52425 Jülich

The Rashba effect is a promising candidate for spin manipulation in future spintronic devices. The strength of the Rashba effect is dependent on the choice of material. Thus determination of the spin-orbit coupling parameter is of importance. Observation of the weak anti-localization allows one to determine the Rashba coupling parameter if other techniques are not applicable.

We report on the magnetotransport properties of the quasi one-dimensional InGaAs/InP structures. 160 wires of the well defined width, connected in parallel, were prepared by etching the heterostructure, containing a two-dimensional electron gas. Gate dependent as well as temperature dependent measurements were performed, in order to determine the Rashba coupling parameter from the enhanced conductance due to weak anti-localization. The results were compared to the values obtained by analysing the beating pattern of the Shubnikov–de Haas oscillations.