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Pattern formation in the exciton inner ring

Remeika, M., Hammack, A. T., Poltavtsev, S. V., Butov, L. V., Wilkes, Joe ORCID:, Ivanov, A. L., Campman, K. L., Hanson, M. and Gossard, A. C. 2013. Pattern formation in the exciton inner ring. Physical Review B 88 (12) , 125307. 10.1103/PhysRevB.88.125307

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We report on the two-beam study of indirect excitons in the inner ring in the exciton emission pattern. One laser beam generates the inner ring and a second weaker beam is positioned in the inner ring. The beam positioned in the inner ring is found to locally suppress the exciton emission intensity. We also report on the inner ring fragmentation and formation of multiple rings in the inner ring region. These features are found to originate from a weak spatial modulation of the excitation beam intensity in the inner ring region. The modulation of exciton emission intensity anticorrelates with the modulation of the laser excitation intensity. The three phenomena—inner ring fragmentation, formation of multiple rings in the inner ring region, and emission suppression by a weak laser beam in the inner ring—have a common feature: a reduction of exciton emission intensity in the region of enhanced laser excitation. This effect is explained in terms of exciton transport and thermalization.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Additional Information: Publisher's pdf uploaded in accordance with the publisher's policy - see (6/12/2016)
Publisher: American Physical Society
ISSN: 0163-1829
Funders: NSF, EPSRC, strategic MIT-Skoltech development program, Russian Ministry of Education and Science
Date of First Compliant Deposit: 6 December 2016
Last Modified: 06 May 2023 03:35

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