Title

Nonperturbative phenomena in semiconductor four-wave mixing spectra

Authors

Authors

M. Erementchouk; M. N. Leuenberger;L. J. Sham

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abstract

Nonperturbative phenomena in four-wave mixing spectra of semiconductors are studied using the exact solution of a widely used phenomenological nonlinear equation of motion of the exciton polarization. It is shown that the Coulomb interaction, included in the nonlinearity, leads to two characteristic effects, which are essentially of dynamical origin-a split of the exciton peak and a nonmonotonous dependence of the response at the exciton frequency on the magnitude of the external field. Relations between the spectral features and the parameters of the system are obtained. It is found that the transition from perturbative to nonperturbative regimes is controlled by parameters inversely proportional to the decay rate. It implies that the condition of low excitation density does not necessarily warrant applicability of the perturbational approach.

Journal Title

Physical Review B

Volume

79

Issue/Number

8

Publication Date

1-1-2009

Document Type

Article

WOS Identifier

WOS:000263816000052

ISSN

1098-0121

Share

COinS