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Excitonic and free-carrier recombination of a two-dimensional electron gas in high magnetic fields

Hayne, M and Jones, Christopher L and Bogaerts, Ria and Usher, Alan and Herlach, Fritz and Moshchalkov, Victor V and Henini, Mohamed (1998) Excitonic and free-carrier recombination of a two-dimensional electron gas in high magnetic fields. Physica B: Condensed Matter, 256. pp. 327-330. ISSN 0921-4526

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Abstract

We have studied the low temperature photoluminescence (PL) of the two-dimensional electron gas in a 100 Angstrom quantum well at fields up to 50 T over four orders of magnitude of laser power. At our highest laser powers we observe excitonic recombination via neutral and negatively charged (X-) excitons, and determine the X- binding energy to fields of 50 T. The binding energies of both singlet and triplet states increase monotonically with field above 15 T. At lower laser powers, in which recombination from the second Landau level is observed at fields up to 2.5 T, a splitting appears at high fields (>10 T) due to the recombination from the singlet and triplet states of X-. These data are inconsistent with a universal transition from free-carrier to excitonic recombination at Landau-level filling factor v=2, but imply that the onset of excitonic recombination is dependent on the illumination conditions.

Item Type: Article
Journal or Publication Title: Physica B: Condensed Matter
Uncontrolled Keywords: photoluminescence ; 2DEGs ; negatively charged excitons ; pulsed fields ; GAAS QUANTUM-WELLS
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Physics
ID Code: 50974
Deposited By: ep_importer_pure
Deposited On: 10 Nov 2011 16:55
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 19:45
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/50974

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