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

Physical Review Letters
K Sivalertporn, E A Muljarov

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.

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Citations

Aug 30, 2019·Optics Letters·A SeedhouseE A Muljarov
Oct 22, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·J S Rojas-AriasH Vinck-Posada

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