Accession Number : ADP007855

Title :   Coulomb Enhancement of Ultrafast Nonlinear in Quantum Well Structures,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

Personal Author(s) : Khurgin, J.

Report Date : 22 MAY 1992

Pagination or Media Count : 3

Abstract : Recent works in the area of ultrafast nonlinearities due to virtual carriers in semiconductor heterostructures have generated significant interest among researchers. It has been shown' that excitons in QW's behave very much like conventional two-level atoms, to the extent that exciton-exciton interaction can be neglected. Therefore, fast coherent phenomena usually associated with two-level system may occur in excitonic QW transitions. Indeed, dynamic (AC) Stark effect in QW's have been demonstrated. When semiconductor QW's were pumped below the absorption edge there were a strong blue shift of the exciton resonance, accompanied by a strong bleaching.

Descriptors :   *EXCITONS, *SEMICONDUCTORS, *HETEROJUNCTIONS, ABSORPTION, BLUE(COLOR), DYNAMICS, EDGES, INTERACTIONS, RESONANCE, STARK EFFECT, TRANSITIONS, FREQUENCY SHIFT.

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE