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Modern Physics Letters B

SQUEEZED EXCITONS IN SEMICONDUCTORS

Nguyen Ba An

Published Apr 10, 1991• 14 citations
Publisher

Abstract

The concept is introduced of squeezed excitons that appear during the process of their interaction with squeezed photons. Situations are considered where the excitons initially are in the Fock or coherent states. For the excitons to become squeezed it is more favourable to prepare them beforehand in a coherent state than in a Fock one. The squeezing degree of excitons depends on that of the initial photons and on detuning.

DOI
10.1142/s0217984991000708

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The concept is introduced of squeezed excitons that appear during the process of their interaction with squeezed photons. Situations are considered where the excitons initially are in the Fock or coherent states. For the excitons to become squeezed it is more favourable to prepare them beforehand in a coherent state than in a Fock one. The squeezing degree of excitons depends on that of the initial photons and on detuning.
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.