Relative intensity of the neutral (X) and negatively charged (X^-) excitons in GaAs/AlGaAs quantum wells
Abstract
The photoluminescence feature associated with a negatively charged exciton can be identified unambiguously by its behavior in the presence of an in-plane electric field. The electric field is created by applying a potential difference between two contacts on the sample. Photoluminescence spectra excited with the laser beam in the vicinity of the positive electrode show a clear enhancement of the (X^-) feature relative to X. When the polarity is reversed, the relative intensity of the (X^-) feature decreases. The reflectivity spectra contain a feature below the e_1h1 exciton which is associated with (X^-). This was verified by the disappearance of this feature above 30 Kelvin.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 1997
- Bibcode:
- 1997APS..MAR.E1205S