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.
| Original language | English (US) |
|---|---|
| Article number | 201303 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 85 |
| Issue number | 20 |
| DOIs | |
| State | Published - May 15 2012 |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Persistent exciton-type many-body interactions in GaAs quantum wells measured using two-dimensional optical spectroscopy. / Turner, Daniel; Wen, Patrick; Arias, Dylan H.; Nelson, Keith A.; Li, Hebin; Moody, Galan; Siemens, Mark E.; Cundiff, Steven T.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 85, No. 20, 201303, 15.05.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Persistent exciton-type many-body interactions in GaAs quantum wells measured using two-dimensional optical spectroscopy
AU - Turner, Daniel
AU - Wen, Patrick
AU - Arias, Dylan H.
AU - Nelson, Keith A.
AU - Li, Hebin
AU - Moody, Galan
AU - Siemens, Mark E.
AU - Cundiff, Steven T.
PY - 2012/5/15
Y1 - 2012/5/15
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.85.201303
DO - 10.1103/PhysRevB.85.201303
M3 - Article
VL - 85
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 20
M1 - 201303
ER -