Coherent dynamics of interwell excitons in GaAs/AlxGa1-xAs superlattices

Mizeikis, V., Birkedal, D., Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 and Hvam, J. M. 1997. Coherent dynamics of interwell excitons in GaAs/AlxGa1-xAs superlattices. Physical Review B 55 (12) , pp. 7743-7748. 10.1103/PhysRevB.55.7743

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Abstract

Coherent exciton dynamics in a GaAs/AlxGa1−xAs narrow-miniband superlattice is studied by spectrally resolved transient four-wave mixing. Coherent optical properties of the investigated structure are found to be strongly affected by the existence of two different heavy-hole excitonic states. One of them, the 1s heavy-hole exciton, is almost identical to the same state in noninteracting quantum wells, while the other, the heavy-hole interwell exciton, is composed of an electron and a heavy hole in adjacent wells. The interwell exciton leads to a resonant enhancement in the four-wave mixing spectra and exhibits quantum beats with the 1s heavy-hole exciton. The dephasing of the interwell exciton is one order of magnitude faster than that of the heavy-hole exciton and is mostly due to intensity-independent scattering mechanisms.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	0163-1829
Last Modified:	28 Oct 2022 08:47
URI:	https://orca.cardiff.ac.uk/id/eprint/72114

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