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.

Subject Categories:

  • Solid State Physics
  • Quantum Theory and Relativity

Distribution Statement:

APPROVED FOR PUBLIC RELEASE