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Modern Physics Letters B

GENERATION OF SQUEEZED EXCITONS IN SEMICONDUCTORS BY COHERENT LIGHT

Nguyen Ba An, THAI HOA TRAN

Published Mar 20, 1992• 2 citations
Publisher

Abstract

In this letter, we show that semiconductor excitons generated by coherent light may become squeezed. This is due to their interactions both with the light and among themselves. Based on a polariton theory and using a secular approximation, analytical expressions for exciton quadrature variances have been derived, which enable us to study easily the dependence of exciton squeezing degree on the pumping light intensity, frequency detuning and strength of exciton-exciton, as well as exciton-photon, interactions.

DOI
10.1142/s0217984992000491

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Acta Physica Sinica•Jan 1, 1981•0 citations
In this letter, we show that semiconductor excitons generated by coherent light may become squeezed. This is due to their interactions both with the light and among themselves. Based on a polariton theory and using a secular approximation, analytical expressions for exciton quadrature variances have been derived, which enable us to study easily the dependence of exciton squeezing degree on the pumping light intensity, frequency detuning and strength of exciton-exciton, as well as exciton-photon, interactions.
Exact time-evolution is analytically derived from a coherent photon-exciton system subjected to a monochromatic radiation field resonant with the exciton-biexciton transition. It is shown that biexcitons, which appear under the resonant pumping, might periodically behave as squeezed quasiparticles, if photons or/and excitons are initially in squeezed states. The squeezing degree of the initial photons or/and excitons, the pumping intensity and the off-resonance detuning are demonstrated to govern the transfer of squeezing from the photon-exciton system to the biexciton.
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This paper is the second part of a theory of the coherent propagation of light wave in semiconductors. After considering the interaction between electrons, the problem of a semiconductor interacting with light is discussed and the equation of exciton polarization wave excited by light wave is obtained. We point out that the equation can be approximated by a set of linear ones and the exciton polarization wave can be regarded as a Bose field only in the limit of low excitation. In this paper, the problem of coherent excitation of discrete exciton level is also discussed specifically. It is shown that the discrete exciton level system excited coherently is approximately equivalent to a two-level atom system excited by light wave in which the difference of energy level is dependent on the degree of excitation and the density of equivalent "two-level atoms" is determined by features of the exciton state wave function.