Regensburg 2000 – scientific programme

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HL: Halbleiterphysik

HL 43: III-V Halbleiter

HL 43.6: Talk

Friday, March 31, 2000, 11:45–12:00, H13

Spin Effects in the Local Density of States of n-Type GaAs — •Peter König, Thomas Schmidt, and Rolf J. Haug — Institut für Festkörperphysik, Universität Hannover, Appelstrasse 2, 30167 Hannover

We present spin-resolved measurements of the local density of states

in Si doped GaAs. Both spin components exhibit strong mesoscopic fluctuations.

In the magnetic quantum limit, the main features of the spin-up and spin-down

components are found to be identical apart from Zeeman splitting.

Based on this observation, we introduce a mesoscopic method to measure

the g-factor in a material where macroscopic methods are severely

restricted by disorder. Differences between the spin-up and spin-down components are discussed in terms of spin relaxation.