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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.70: Poster

Donnerstag, 26. März 2009, 15:00–17:30, P2

Wavefunctions in the valence band of InAs quantum dots — •Razvan Roescu¹, Dirk Reuter¹, Andreas D. Wieck¹, Ulrich Zeitler², and Jan C. Maan² — ¹Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany — ²High Field Magnet Laboratory, Radboud University Nijmegen, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands.

Magneto-capacitance spectroscopy of InAs self-assembled quantum dots allows the momentum space wavefunctions mapping of conduction and valence band states. To do this, a magnetic field is varied (strength and direction) in the base plane of the quantum dots.

The perpendicular magnetic field would also influence the wavefunctions, therefore capacitance-voltage spectroscopy in a tilted field should reveal this effect.

We will present the result of such experiments performed on self-assembled InAs/GaAs quantum dots embedded in a Schottky diode with a carbon doped p-type back contact. The results cannot be explained by a simple model and possible consequences are discussed.