Accession Number:
ADA191542
Title:
Optical Properties of Heterostructures and Superlattices.
Descriptive Note:
Final rept. 15 Jun 84-31 Dec 86,
Corporate Author:
MASSACHUSETTS INST OF TECH CAMBRIDGE
Personal Author(s):
Report Date:
1988-03-01
Pagination or Media Count:
24.0
Abstract:
The project for the study of the optical properties of single and multiple quantum wells involved both experimental and theoretical studies of such heterostructures. This study has utilized a variety of optical techniques such as laser excited luminescence, photoreflectance, laser emission with and without magnetic fields. The initial experiments which were conducted on a single quantum well of GaAsGaAlAs structure led to an interesting discovery and explanation of exciton transport at low excitation intensities at a critical range of temperatures. The second class of experiments involved high intensity laser excitation which led to the discovery of a new lower high density excitonic state below the lowest exciton when under moderate excitation. The identification of this new state was facilitated by the use of high magnetic fields. A corollary to this experiment was the observation of the electron-hole plasma state at the highest intensities. This occurs at still a lower energy and was shown tol be the source of stimulated emission in a quantum well.
Descriptors:
- *QUANTUM ELECTRONICS
- *SOLID STATE PHYSICS
- CRITICAL TEMPERATURE
- ELECTRONS
- EMISSION
- EXCITATION
- EXCITONS
- HIGH RATE
- HOLES(ELECTRON DEFICIENCIES)
- INTENSITY
- LASERS
- LOW ENERGY
- LOW INTENSITY
- LUMINESCENCE
- MAGNETIC FIELDS
- METHODOLOGY
- OPTICS
- SOURCES
- STIMULATION(GENERAL)
- HETEROJUNCTIONS
- TRANSPORT PROPERTIES
- GALLIUM ARSENIDES
- ALUMINUM GALLIUM ARSENIDES
- ELECTRONIC STATES
Subject Categories:
- Solid State Physics
- Quantum Theory and Relativity