Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 6: Quantum dots and wires: Transport properties I
HL 6.6: Vortrag
Montag, 27. März 2006, 11:30–11:45, BEY 118
Probing a Kondo correlated quantum dot with spin spectroscopy — •M. C. Rogge1, D. Kupidura1, M. Reinwald2, W. Wegscheider2, and R. J. Haug1 — 1Institut für Festkörperphysik, Universität Hannover, D-30167 Hannover — 2Angewandte und Experimentelle Physik, Universität Regensburg, D-93040 Regensburg
We investigate Kondo effect and spin blockade observed on a many-electron quantum dot and study the magnetic field dependence. The quantum dot is built using local anodic oxidation. In a 3He/4He dilution refrigerator the magnetic field dependence of the differential conductance is measured. At lower fields a pronounced Kondo chessboard pattern is found which is replaced by spin blockade at higher fields. In an intermediate regime both effects are visible and the spin of the tunneling electron in the Kondo regime is detected. We make use of this combined effect to gain information about the internal spin configuration of our quantum dot. We find that the data cannot be explained assuming regular filling of electronic orbitals. Instead spin polarized filling seems to be probable. We compare our results with other publications of chessboard patterns and find a correlation with the electron number.