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

Journal Article · Mon Oct 05 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4932537· OSTI ID:22482208

Webber, D.; Hacquebard, L.; Hall, K. C. ^[1]; Liu, X.; Dobrowolska, M.; Furdyna, J. K. ^[2]

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1. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H 4R2 (Canada)
2. Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)

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.

• OSTI ID: 22482208
• Journal Information: Applied Physics Letters, Vol. 107, Issue 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 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