Dietl, S. and Kowalik-Seidl, K. and Schuh, D. and Wegscheider, W. and Holleitner, A. W. and Wurstbauer, U. (2017) Overflow of a dipolar exciton trap at high magnetic fields. SUPERLATTICES AND MICROSTRUCTURES, 108. pp. 42-50. ISSN 0749-6036,
Full text not available from this repository. (Request a copy)Abstract
We study laterally trapped dipolar exciton ensembles in coupled GaAs quantum wells at high magnetic fields in the Faraday configuration. In photoluminescence experiments, we identify three magnetic field regimes. At low fields, the exciton density is increased by a reduced charge carrier escape from the trap, and additionally, the excitons' emission energy is corrected by a positive diamagnetic shift. At intermediate fields, magnetic field dependent correction terms apply which follow the characteristics of a neutral magnetoexciton. Due to a combined effect of an increasing binding energy and lifetime, the exciton density is roughly doubled from zero to about 7 T. At the latter high field value, the charge carriers occupy only the lowest Landau level. In this situation, the exciton trap can overflow independently from the electrostatic depth of the trapping potential, and the energy shift of the excitons caused by the so-called quantum confined Stark effect is effectively compensated. Instead, the exciton energetics seem to be driven by the magnetic field dependent renormalization of the many-body interaction terms. In this regime, the impact of parasitic in-plane fields at the edge of trapping potential is eliminated. (C) 2017 Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COUPLED QUANTUM-WELLS; SPATIALLY SEPARATED ELECTRON; BOSE-EINSTEIN STATISTICS; FREE-CARRIERS; HOLE LAYERS; GAS; SEMICONDUCTOR; GAAS; PHOTOLUMINESCENCE; CONFINEMENT; Dipolar excitons; Electrostatic trap; Magnetic field; High exciton density |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:16 |
| Last Modified: | 19 Feb 2019 13:21 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1503 |
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