Accession Number : ADP007844

Title :   Ultrafast Dynamics of Magnetically Confined Excitons in GaAs Quantum Wells,

Corporate Author : AT AND T BELL LABS HOLMDEL NJ

Personal Author(s) : Stark, J. B. ; Knox, W. H. ; Chemia, D. S. ; Schmitt-Rink, S.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Spatial confinement along one dimension, using the methods of epitaxial crystal growth, has demonstrated that linear and nonlinear optical properties depend strongly on dimensionality. Confinement along the remaining directions, however, continues to present formidable technological obstacles. Difficulties in the control of the surface properties and size distribution of quantum dots and semiconductor microcrystallites results in materials with unsatisfactory optical quality. Confinement along all three dimensions can be achieved, in materials of excellent optical quality, by placing a quantum well material in a perpendicular magnetic field. As the field is increased, the extension of the resulting electronic orbitals decreases, so that the dimensionality of the states may be tuned from two to zero dimensions. Using femtosecond excite-and-probe optical techniques in fields as large as 12 Tesla, we measure the time resolved dynamics of zero dimensional magneto-excitons.

Descriptors :   *CONTROL, *CRYSTAL GROWTH, *EXCITONS, CHANNELS, CRYSTALS, DISTRIBUTION, DYNAMICS, ELECTRONICS, MAGNETIC FIELDS, MAGNETOS, MODIFICATION, OPTICAL PROPERTIES, PROBES, QUALITY, RELAXATION, RESONANCE, SCATTERING, SEMICONDUCTORS, SURFACE PROPERTIES, GALLIUM ARSENIDES.

Subject Categories : Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE