Accession Number : ADP007842

Title :   Excitonic Phenomena in the Quantum Hall Effect Regime,

Corporate Author : BROWN UNIV PROVIDENCE RI

Personal Author(s) : Chen, W. ; Fritze, M. ; Nurmikko, A. V.

Report Date : 22 MAY 1992

Pagination or Media Count : 2

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.

Descriptors :   *HALL EFFECT, *PHOTOLUMINESCENCE, *QUANTUM ELECTRONICS, ABSORPTION, CRYSTALLIZATION, ELECTRONS, HETEROJUNCTIONS, INTERACTIONS, MAGNETIC FIELDS, MODULATION, PERTURBATIONS, PROBES, STEADY STATE.

Subject Categories : Electrooptical and Optoelectronic Devices
      Quantum Theory and Relativity

Distribution Statement : APPROVED FOR PUBLIC RELEASE