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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Autler-Townes splitting of excitons and biexcitons in semiconductors

P. I. Khadzhi, L. Yu. Nad’kin, D. V. Tkachenko

Published May 3, 2006• 0 citations
Publisher

Abstract

The behavior of the semiconductor dielectric susceptibility under the stationary action of a strong laser pulse in the range of M-band of luminescence and the test pulse in the exciton range of spectrum is investigated. The well pronounced Autler-Townes effect occurs at the exciton range. The position of the absorption peaks is determined by the amplitude and frequency of pump pulse.

DOI
10.1117/12.677871

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The behavior of the semiconductor dielectric susceptibility under the stationary action of a strong laser pulse in the range of M-band of luminescence and the test pulse in the exciton range of spectrum is investigated. The well pronounced Autler-Townes effect occurs at the exciton range. The position of the absorption peaks is determined by the amplitude and frequency of pump pulse.
The hysteretical behavior of imaginary and real parts of the semiconductor susceptibility in the exciton range of spectrum taking into account the exciton-photon and elastic exciton- exciton interaction in the pump-probe regime depending on the intensity and frequency of the strong pump laser pulse and on the frequency of the test pulse is studied. The conditions of the emergence of the damping suppression and test pulse gain are determined. The abrupt red and blue shifts of the spectral position of the exciton absorption band depending on the intensity of the pump pulse are predicted.
Optical interband excitonic absorption of semiconductor quantum wells (QW’s) driven by a coherent pump field is investigated on the basis of semiconductor Bloch equations. The pump field has a photon energy close to the intersubband spacing between the first two conduction subbands in the QW’s. An external weak optical field probes the interband transition. The excitonic effects and pump-induced population redistribution within the conduction subbands in the QW system are included. When the density of the electron–hole pairs in the QW structure is low, the pump field induces an Autler–Townes splitting of the exciton absorption spectrum. The split size and the peak positions of the absorption doublet depend not only on the pump frequency and intensity but also on the carrier density. As the density of the electron–hole pairs is increased, the split contrast (the ratio between the maximum and the minimum values) is decreased, because the exciton effect is suppressed at higher densities owing to the many-body screening.