Controlled Strong Coupling and Absence of Dark Polaritons in Microcavities with Double Quantum Wells

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...

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Bibliographic Details
Published in:Physical review letters 2015-08, Vol.115 (7), p.077401-077401, Article 077401
Main Authors: Sivalertporn, K, Muljarov, E A
Format: Article
Language:English
Subjects:
Asymmetry
Electric fields
Excitation
Holes
Joining
Microcavities
Polaritons
Quantum wells
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.115.077401