Regensburg 2007 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 24: Quantum dots and wires: Transport properties II
HL 24.6: Vortrag
Dienstag, 27. März 2007, 15:15–15:30, H15
Magnetic-field-induced modification of the wave-functions in InAs quantum dots — •Wen Lei1, Oliver Wibbelhoff1, Christian Notthoff1, Axel Lorke1, Dirk Reuter2, and Andreas Wieck2 — 1Department of Physics, Universität Duisburg-Essen, Lotharstr. 1, 47048 Duisburg, Germany — 2Solid State Physics, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany
The wave-function of electrons and holes in quantum dots (QDs) are very important for their properties and device applications. In this work, we present the wave-function mapping of InAs quantum dots by C-V spectroscopy under additional perpendicular magnetic field. Without perpendicular magnetic field, the energy states commonly labeled as "p-states" show an x-y-symmetry, oriented along the [110] and [1-10] crystal axes. When a perpendicular magnetic field (Bz) is applied, the magnetic forces are expected to mix the x- and y- states such that two circularly symmetric states (P+ and P-) with different angular momenta (l=+1 and l=-1) develop. Contrary to these expectations, we observe that the wave-functions of P+ and P- states behave differently. With increasing the perpendicular magnetic field, the wave-function of P+ state gradually develops circular symmetry with a node in the center, as expected from the theory. Surprisingly, the P- state behaves similarly but exhibits the characters of a *s-state* under high perpendicular magnetic field. The possible reasons for this unusual behavior of P- state are proposed and discussed.