Dresden 2003 – scientific programme
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HL: Halbleiterphysik
HL 48: Quantenpunke und -dr
ähte: Transporteigenschaften III
HL 48.5: Talk
Thursday, March 27, 2003, 16:15–16:30, BEY/81
Level anticrossings in quantum dots probed by single electron tunneling — •Jens Könemann1, Maik Krüger1, Duncan Maude2, Andreas Waag3, and Rolf J. Haug1 — 1Institut für Festkörperphysik, Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany — 2High Magnetic Field Laboratory, CNRS, 25 Avenue des Martyrs, BP 166, 38042 Grenoble cedex 9, France — 3Universität Ulm, Abteilung Halbleiterphysik, Albert-Einstein-Allee 45, 89069 Ulm
We have studied the single-particle spectrum of a single localized state in a vertical resonant tunneling structure in high magnetic fields up to 28 T. At low magnetic fields the eletronic levels were not equally-spaced as to be expected for a harmonic confinement, but lifting of the degeneracy of orbital states is observed. Our measurements of the spectrum are in agreement to theoretical predictions considering an anisotropic confinement potential of our localized state.
At high magnetic fields beyond 12 T the traces of the electronic levels follow parallel lines with an equal spacing and a constant slope in the magnetic field, while a linear Zeeman splitting with g-factors of |g*|≈ 0.25 is observed.
In the intermediate field range between 4 T and 12 T strong anti-crossings of the electronic levels are observed.