Voltage control of the spin-dependent interaction constants of dipolaritons and its application to optical parametric oscillators

A. V. Nalitov, D. D. Solnyshkov, N. A. Gippius, G. Malpuech

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    9 Citations (Scopus)

    Abstract

    A dipolariton is a voltage-controlled mixture of direct and indirect excitons in asymmetric double quantum wells coupled by resonant carrier tunneling, and a microcavity photon. We calculate the voltage dependence of the spin-singlet and spin-triplet interaction parameters α1 and α2. Both parameters can reach values 1 order of magnitude larger than that of exciton-polaritons thanks to the strong interaction between indirect excitons. We show that the variation of the indirect exciton fraction of the dipolaritons induces a change of sign of α2: the interaction passes from attractive to repulsive with increasing voltage. For large enough voltage, α2 becomes larger than α1, which in principle can lead to the formation of a circularly polarized dipolariton condensate. We propose an application of the α2 dependence to a voltage-controlled dipolaritonic optical parametric oscillator. The change of sign of α2 allows on-site control of the linear polarization degree of the optical signal and its on-demand inversion.

    Original languageEnglish
    Article number235304
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume90
    Issue number23
    DOIs
    Publication statusPublished - 1 Dec 2014

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