Bosonic stimulation of cold excitons in a harmonic potential trap in Cu2O

摘要

A high-density cold exciton gas is generated in a harmonic potential trap by two-photon resonance excitation of Cu2O 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. (c) 2004 Elsevier B.V. All rights reserved.