1. Enlarged magnetic focusing radius of photoinduced ballistic currents
- Author
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Stallhofer, Markus, Kastl, Christoph, Brändlein, Marcel, Schuh, Dieter, Wegscheider, Werner, Kotthaus, Jörg. P., Abstreiter, Gerhard, and Holleitner, Alexander
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics - Abstract
We exploit GaAs-based quantum point contacts as mesoscopic detectors to analyze the ballistic flow of photogenerated electrons in a two-dimensional electron gas at a perpendicular magnetic field. Whereas charge transport experiments always measure the classical cyclotron radius, we show that this changes dramatically when detecting the photoinduced non-equilibrium current in magnetic fields. The experimentally determined radius of the trajectories surprisingly exceeds the classical cyclotron value by far. Monte Carlo simulations suggest electron-electron scattering as the underlying reason., Comment: pdf-file includes both main article and supplementary information
- Published
- 2012
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