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

Sivalertporn, K. and Muljarov, E. A. ORCID: https://orcid.org/0000-0002-2878-4148 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:	Publication
Status:	Published
Schools:	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:	31 Oct 2022 10:59
URI:	https://orca.cardiff.ac.uk/id/eprint/86932

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