Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 9: Poster I

HL 9.81: Poster

Montag, 27. März 2006, 15:15–17:45, P3

Magneto-capacitance Spectroscopy of Self-assembled InAs Quantum Dots — •R. Roescu, P. Kailuweit, D. Reuter, and A. D. Wieck — Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany

We have investigated self-assembled InAs quantum dots (QDs) by magneto-capacitance-voltage (C-V) spectroscopy to obtain insight into their energy band structure.

The dispersion of the charging peaks with perpendicular field (i.e. field direction perpendicular to the growth plane) gives information of the orbital angular momentum of the individual charging peaks [1]. Monitoring the height of the capacitance signal as a function of an in-plane field allows mapping the wave functions of the QDs in momentum space [2].

We will discuss the results for electrons as well as for holes and point out the significant differences.

[1] R. J. Warburton et all, Phys. Rev. B 58 no. 24 (1998) 16221-16231

[2] O. Wibbelhoff et all, Physica E21 (2004) 516-520

Financial support from the DFG GRK384 is gratefully acknowledged.