Browsing by Author "MacDonald, A. H."

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Microscopic theory of equilibrium polariton condensates
(2016-12-02)
Xue, Fei
;
Wu, Fengcheng
;
Xie, Ming
;
Su, Jung-Jung
;
MacDonald, A. H.
We present a microscopic theory of the equilibrium polariton condensate state of a semiconductor quantum well in a planar optical cavity. The theory accounts for the adjustment of matter excitations to the presence of a coherent photon field, predicts effective polariton-polariton interaction strengths that are weaker and condensate exciton fractions that are smaller than in the commonly employed exciton-photon model, and yields effective Rabi coupling strengths that depend on the detuning of the cavity-photon energy relative to the bare exciton energy. The dressed quasiparticle bands that appear naturally in the theory provide a mechanism for electrical manipulation of polariton condensates.