Regensburg 2004 – scientific programme

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PV: Plenarvorträge

PV VII

PV VII: Plenary Talk

Wednesday, March 10, 2004, 12:00–12:45, H1

Nanoscale Study of Quantum Phenomena: Influence of Dimension, Magnetic Field and Disorder on Simple Electron Systems — •Markus Morgenstern — Institute of Applied Physics, Hamburg University, Jungiusstr. 11, D-20355 Hamburg, Germany — Träger des Walter-Schottky-Preises 2004

Scanning Tunneling Spectroscopy is a tool to measure the local density of states, which is the sum over squared single-particle wave functions. Applying this technique to the simple, quasi-free electron systems of III-V semiconductors allows to tackle the influence of interactions on the local scale rather systematically. Basically four parameters,- dimension, electron density, magnetic field, and disorder potential-, govern the phase diagram of the system.

We started to vary these parameters and indeed found a rather different appearance of the local density of states. Here, I concentrate on the two-dimensional electron system investigated at different magnetic fields and disorder strengths. Real-space visualizations of the influence of weak localization, drift states in the quantum-Hall regime, and percolation are given. In addition, the single-particle wave functions of strain-induced InAs quantum dots will be shown.