Excitonic Phenomena in the Quantum Hall Effect Regime,
Abstract
The use of optical spectroscopic probes show exciting new possibilities and avenues in the investigation of 2-dimensional (2D) and lower dimensional electron systems in high magnetic fields, e.g. in studies of the Quantum Hall effect and (possible) Wigner crystallization. Both spectral shifts and pronounced amplitude changes have been observed in luminescence and absorption from modulation-doped heterojunctions, which are to varying degrees commensurate with integer and/or fractional filling factors. A key question concerns the physical mechanism behind the interaction of the optically active probe with the 2D gas, and whether the probe acts as a weak or strong perturbation. We have investigated these issues in asymmetric, n-type (A1,Ga)As/(In,Ga)As/GaAs and (A1,Ga)As/GaAs/(A1,Ga) As single quantum wells through steady state and picosecond photoluminescence experiments.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 22, 1992
- Accession Number
- ADP007842
Entities
People
- A. V. Nurmikko
- M. Fritze
- Wei Chen
Organizations
- Brown University