On the parabolicity of dipolar exciton traps and their population of excess charge carriers
Abstract
Abstract We study spatially trapped ensembles of dipolar excitons in coupled quantum wells by means of photoluminescence and photocurrent spectroscopy. The photogenerated excitons are confined in very clean GaAs double quantum well structures and electrostatically trapped by local gate electrodes. We find that the common approach of electrostatic trap geometries can give rise to an in-plane imbalance of charge carriers especially when an over-barrier excitation is utilized. The excess charge carriers can give rise to an effective parabolic confinement potential for the excitons. In photoluminescence spectra, we identify the emission of both neutral indirect excitons and states influenced by the excess charge carrier density. We find that the charge imbalance in the excitonic ensemble strongly influences the radiative lifetimes of both. Our findings shine a new light on the properties of trapped dipolar exciton ensembles. This is of significant relevance to common interpretations of experimental results in terms of signatures for the formation of ‘dark’ and ‘gray’ excitonic condensates.
- Authors:
- Publication Date:
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1527214
- Resource Type:
- Published Article
- Journal Name:
- New Journal of Physics
- Additional Journal Information:
- Journal Name: New Journal of Physics Journal Volume: 21 Journal Issue: 6; Journal ID: ISSN 1367-2630
- Publisher:
- IOP Publishing
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Dietl, S., Sigl, L., Sponfeldner, L., Gardner, G., Manfra, M., Kotthaus, J. P., Wurstbauer, U., and Holleitner, A. W. On the parabolicity of dipolar exciton traps and their population of excess charge carriers. United Kingdom: N. p., 2019.
Web. doi:10.1088/1367-2630/ab1c89.
Dietl, S., Sigl, L., Sponfeldner, L., Gardner, G., Manfra, M., Kotthaus, J. P., Wurstbauer, U., & Holleitner, A. W. On the parabolicity of dipolar exciton traps and their population of excess charge carriers. United Kingdom. https://doi.org/10.1088/1367-2630/ab1c89
Dietl, S., Sigl, L., Sponfeldner, L., Gardner, G., Manfra, M., Kotthaus, J. P., Wurstbauer, U., and Holleitner, A. W. Thu .
"On the parabolicity of dipolar exciton traps and their population of excess charge carriers". United Kingdom. https://doi.org/10.1088/1367-2630/ab1c89.
@article{osti_1527214,
title = {On the parabolicity of dipolar exciton traps and their population of excess charge carriers},
author = {Dietl, S. and Sigl, L. and Sponfeldner, L. and Gardner, G. and Manfra, M. and Kotthaus, J. P. and Wurstbauer, U. and Holleitner, A. W.},
abstractNote = {Abstract We study spatially trapped ensembles of dipolar excitons in coupled quantum wells by means of photoluminescence and photocurrent spectroscopy. The photogenerated excitons are confined in very clean GaAs double quantum well structures and electrostatically trapped by local gate electrodes. We find that the common approach of electrostatic trap geometries can give rise to an in-plane imbalance of charge carriers especially when an over-barrier excitation is utilized. The excess charge carriers can give rise to an effective parabolic confinement potential for the excitons. In photoluminescence spectra, we identify the emission of both neutral indirect excitons and states influenced by the excess charge carrier density. We find that the charge imbalance in the excitonic ensemble strongly influences the radiative lifetimes of both. Our findings shine a new light on the properties of trapped dipolar exciton ensembles. This is of significant relevance to common interpretations of experimental results in terms of signatures for the formation of ‘dark’ and ‘gray’ excitonic condensates.},
doi = {10.1088/1367-2630/ab1c89},
journal = {New Journal of Physics},
number = 6,
volume = 21,
place = {United Kingdom},
year = {Thu Jun 20 00:00:00 EDT 2019},
month = {Thu Jun 20 00:00:00 EDT 2019}
}
https://doi.org/10.1088/1367-2630/ab1c89
Web of Science
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