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Controlled strong coupling and absence of dark polaritons in microcavities with double quantum wells

Sivalertporn, K. and Muljarov, Egor A. 2015. Controlled strong coupling and absence of dark polaritons in microcavities with double quantum wells. Physical Review Letters 115 (7) , 077401. 10.1103/PhysRevLett.115.077401

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Abstract

We demonstrate an efficient switching between strong and weak exciton-photon coupling regimes in microcavity-embedded asymmetric double quantum wells, controlled by an applied electric field. We show that a fine-tuning of the electric field leads to drastic changes in the polariton properties, with the polariton ground state being redshifted by a few meV and having acquired prominent features of a spatially indirect dipolar exciton. We study the properties of dipolar exciton polaritons, called dipolaritons, on a microscopic level and show that, unlike recent findings, they are not dark polaritons but, owing to the finite size of the exciton, are mixed states with a comparable contribution of the cavity photon, bright direct, and long-living indirect exciton modes.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Additional Information: PDF uploaded in accordance with publisher's policies at http://www.sherpa.ac.uk/romeo/issn/0031-9007/ (accessed 18.2.16).
Publisher: American Physical Society
ISSN: 0031-9007
Date of Acceptance: 30 July 2015
Last Modified: 15 Mar 2019 14:36
URI: http://orca.cf.ac.uk/id/eprint/86932

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