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

Webber, D.; Hacquebard, L.; Hall, K. C.; Liu, X.; Dobrowolska, M.; Furdyna, J. K.

doi:10.1063/1.4932537

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

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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.

Authors:

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

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

Publication Date:: Mon Oct 05 00:00:00 EDT 2015

OSTI Identifier:: 22482208

Resource Type:: Journal Article

Journal Name:: Applied Physics Letters

Additional Journal Information:: Journal Volume: 107; Journal Issue: 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951

Country of Publication:: United States

Language:: English

Subject:: 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

Citation Formats


                    Webber, D., Hacquebard, L., Hall, K. C., Liu, X., Dobrowolska, M., and Furdyna, J. K. Role of many-body effects in the coherent dynamics of excitons in low-temperature-grown GaAs.  United States: N. p., 2015. 
        Web.  doi:10.1063/1.4932537.

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                    Webber, D., Hacquebard, L., Hall, K. C., Liu, X., Dobrowolska, M., & Furdyna, J. K. Role of many-body effects in the coherent dynamics of excitons in low-temperature-grown GaAs.  United States.  https://doi.org/10.1063/1.4932537

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                    Webber, D., Hacquebard, L., Hall, K. C., Liu, X., Dobrowolska, M., and Furdyna, J. K. 2015.  
        "Role of many-body effects in the coherent dynamics of excitons in low-temperature-grown GaAs".  United States.  https://doi.org/10.1063/1.4932537.

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@article{osti_22482208,

  title        = {Role of many-body effects in the coherent dynamics of excitons in low-temperature-grown GaAs},

  author       = {Webber, D. and Hacquebard, L. and Hall, K. C. and Liu, X. and Dobrowolska, M. and Furdyna, J. K.},

  abstractNote = {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.},

  doi          = {10.1063/1.4932537},

  url          = {https://www.osti.gov/biblio/22482208},
  journal      = {Applied Physics Letters},

  issn         = {0003-6951},

  number       = 14,

  volume       = 107,

  place        = {United States},

  year         = {Mon Oct 05 00:00:00 EDT 2015},

  month        = {Mon Oct 05 00:00:00 EDT 2015}

}

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