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We present a microscopic theory of a photon drag effect that appears in aBose-Einstein condensate of neutral particles, considering indirect excitons ina double quantum well nanostructure under the action of a circularly polarizedelectromagnetic field. It is shown that the dynamical polarization of excitonsresults in a resonant behavior of the exciton photon drag flux when thefrequency of light is close to the gap between two energy levels of internalexciton motion. Specifically, we consider the ground and first excited energystates characterized by the angular momentum difference $\pm 1$, and thus, thehelicity of light matters. We show that the resulting drag current is caused byboth Bose-condensed particles and the particles in the normal state. As aresult, the total current represents a superposition of thresholdlike andresonant contributions, - property, which can be used in frequency-selectivephotodetection.

Proposal for frequency-selective photodetector based on the resonant photon drag effect in a condensate of indirect excitons