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Physica Scripta

The influence of the resonant electromagnetic field on light absorption by exciton and biexciton in quantum wells

Nguyễn Hồng Quang, A. I. Bobrysheva

Published Jan 1, 1993• 1 citation
Publisher

Abstract

The influence is investigated of a resonant electromagnetic field on the light absorption by the exciton and biexciton in semiconductor quantum wells. The probabilities of exciton one-photon and biexciton two-photon absorption are calculated.
DOI
10.1088/0031-8949/47/1/023

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The theory of the coherent pairing of excitons in the presence of a resonant electromagnetic field is generalized to describe the biexciton spectra of molecular crystals, which contain several molecules (atoms) in the unit cell. The excitation spectrum for crystals like anthracene having two molecules per unit cell is discussed in detail. It is found that, at high exciton densities and under resonance of near-resonance conditions and at temperatures below some value T c , the formation of four biexciton states is feasible provided that the dielectric gaps induced by the electromagnetic field are less than those of the corresponding biexciton states. Expressions for the absorption coefficient describing optical transitions to the biexciton states are derived.