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Author Webber, D. ♦ Hacquebard, L. ♦ Hall, K. C. ♦ Liu, X. ♦ Dobrowolska, M. ♦ Furdyna, J. K.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CARRIERS ♦ COUPLING ♦ EXCITONS ♦ FREQUENCY MIXING ♦ GALLIUM ARSENIDES ♦ LASERS ♦ MANY-BODY PROBLEM ♦ NONLINEAR PROBLEMS ♦ OPTOELECTRONIC DEVICES ♦ POLARIZATION ♦ PULSES ♦ TEMPERATURE RANGE 0065-0273 K ♦ TRAPPING
Abstract Femtosecond four-wave mixing experiments on low-temperature-grown (LT-) GaAs indicate a polarization-dependent nonlinear optical response at the exciton, which we attribute to Coulomb-mediated coupling between excitons and electron-hole pairs simultaneously excited by the broad-bandwidth laser pulses. Strong suppression of the exciton response through screening by carriers injected by a third pump pulse was observed, an effect that is transient due to rapid carrier trapping. Our findings highlight the need to account for the complex interplay of disorder and many-body effects in the design of ultrafast optoelectronic devices using this material.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-10-05
Publisher Place United States
Journal Applied Physics Letters
Volume Number 107
Issue Number 14


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