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Excitonic binding in coupled quantum wells

Szymanska, MH; Littlewood, PB; (2003) Excitonic binding in coupled quantum wells. Physical Review B - Condensed Matter and Materials Physics , 67 (19) 1933051 - 1933054. 10.1103/PhysRevB.67.193305. Green open access

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Abstract

We study excitonic states in the presence of applied electric field in 8-nm GaAs coupled quantum wells (QW’s) separated by a 4-nm Al0.33Ga0.67As barrier and in 6-nm In0.1Ga0.9As coupled QW’s separated by a 4-nm GaAs barrier in which effects attributed to macroscopically ordered excitonic states have been recently reported. We discuss the differences in the nature of the states and in the origin of confinement which determines the change of excitonic properties with increase in the applied electric field in both structures. We have found that the indirect exciton binding energy for the field amplitude used in the experiment with InGaAs QW’s is around 3.5 meV, much less than the previously reported 10 meV value. This suggests that the optically induced ring structure, reported to persist to near 100 K, might not be caused by collective excitonic transport.

Type: Article
Title: Excitonic binding in coupled quantum wells
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.67.193305
Publisher version: http://dx.doi.org/10.1103/PhysRevB.67.193305
Language: English
Additional information: © 2003 The American Physical Society
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1398696
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