Accession Number : ADA204840

Title :   Electron-Phonon Interaction in Optically-Pumped Semiconductor Quantum Wells.

Descriptive Note : Final rept. 1 Jun 85-30 Sep 88,

Corporate Author : STATE UNIV OF NEW YORK AT BUFFALO DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s) : McCombe, Bruce D. ; Chang, Y. H. ; Reeder, A. A. ; Cheng, J. P. ; Li, W. J.

Report Date : 20 JAN 1988

Pagination or Media Count : 40

Abstract : The importance of the electron-optical-phonon interaction in polar semiconductors is well-recognized, and for bulk semiconductors it is reasonably well-understood. The situation for quasi-two-dimensional electronic systems is much less clear, and a number of experiments carried out on systems with large electron densities have yielded apparently conflicting results. The present three year project has been directed at clarifying the situation by investigating confined systems with low electron densities, for which single particle theories are expected to be valid. Experiments were carried out at low temperatures (4.2K -60K) on several GaAs/AlGaAs multiple-quantum-well (MQW) samples with well widths between 125 angstroms and 450 angstroms. Most samples were lightly doped in the centers of the wells with Si donors; one undoped sample was also investigated in the interband optical measurements. Three separate resonant magneto-optical experiments were carried out in the course of this work. (rh)

Descriptors :   *BULK SEMICONDUCTORS, *ELECTRON DENSITY, *MAGNETOOPTICS, *OPTICAL PUMPING, *PHONONS, *QUANTUM ELECTRONICS, *SEMICONDUCTORS, CONFINEMENT(GENERAL), ELECTRONS, INTERACTIONS, LOW DENSITY, LOW TEMPERATURE, PARTICLES, POLAR REGIONS, RESONANCE, THEORY, WIDTH.

Subject Categories : Solid State Physics
      Quantum Theory and Relativity

Distribution Statement : APPROVED FOR PUBLIC RELEASE