Bose–Einstein\nCondensation of Polaritons at\nRoom Temperature in a GaAs/AlGaAs Structure

We report the canonical properties of the Bose–Einstein\ncondensation of polaritons in the weak coupling regime, seen previously\nin many low-temperature experiments, at room temperature in a GaAs/AlGaAs\nstructure. These effects include a nonlinear energy shift of the polaritons,\nshowing that they are not noninteracting photons, and dramatic line\nnarrowing due to coherence, giving coherent emission with a spectral\nwidth of 0.24 meV at room temperature with no external stabilization.\nThis opens up the possibility of room temperature nonlinear optical\ndevices based on polariton condensation.