Role of many-body effects in the coherent dynamics of excitons in low-temperature-grown GaAs

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 pulse...

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Bibliographic Details
Published in:Applied physics letters 2015-10, Vol.107 (14)
Main Authors: Webber, D., Hacquebard, L., Liu, X., Dobrowolska, M., Furdyna, J. K., Hall, K. C.
Format: Article
Language:English
Subjects:
Applied physics
CARRIERS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COUPLING
EXCITONS
Femtosecond pulses
Four-wave mixing
FREQUENCY MIXING
GALLIUM ARSENIDES
Holes (electron deficiencies)
LASERS
Low temperature
MANY-BODY PROBLEM
NONLINEAR PROBLEMS
Nonlinear response
OPTOELECTRONIC DEVICES
POLARIZATION
PULSES
TEMPERATURE RANGE 0065-0273 K
TRAPPING
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Summary: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:0003-6951
1077-3118
DOI:10.1063/1.4932537