Abstract
A high-density cold exciton gas is generated in a harmonic potential trap by two-photon resonance excitation of Cu 2 O at 2 K. Strongly localized light signal is observed at the bottom of the potential trap when the exciton density exceeds 10 17 cm - 3 . The possibility of bosonic stimulation of excitons from the trap rim to the bottom is discussed in connection with the origin of the light signal.
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