Persistent exciton-type many-body interactions in GaAs quantum wells measured using two-dimensional optical spectroscopy
Name
Turner-2012-Persistent exciton-type many-body interactions in GaAs quantum wells measured using two-dimensional optical spectroscopy.pdf
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1.23 MB
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Adobe PDF
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Author(s)
Turner, Daniel B.
Wen, Patrick
Arias, Dylan H.
Nelson, Keith Adam
Li, Hebin
Moody, Galan
Siemens, Mark E.
Cundiff, Steven T.
Date Issued
May 2012
Journal
Physical Review B
Publisher
American Physical Society
Citation
Turner, Daniel et al. “Persistent Exciton-type Many-body Interactions in GaAs Quantum Wells Measured Using Two-dimensional Optical Spectroscopy.” Physical Review B 85.20 (2012). ©2012 American Physical Society
Version
Final published version
Abstract
Studies have shown that many-body interactions among semiconductor excitons can produce distinct features in two-dimensional optical spectra. However, to the best of our knowledge, the dynamics of many-body interactions have not been measured in two-dimensional (2D) spectroscopy studies. Here we measure 2D spectra of GaAs quantum wells at many different “waiting” times and study the time dependence of the spectral features. Characteristic signatures of exciton polarization correlations manifest in the diagonal peaks decay at the exciton dephasing rate, consistent with theoretical predictions. Other many-body interactions manifest in off-diagonal features decay much more slowly. These persistent off-diagonal features must be due to many-body interactions involving exciton populations, and their persistence cannot be predicted by theoretical descriptions restricted to the coherent limit.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. School of Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.85.201303
