Auger decay, Spin-exchange, and their connection to Bose-Einstein condensation of excitons in Cu2O
G. M. Kavoulakis, A. Mysyrowicz
Abstract
In view of the recent experiments of O'Hara, et al. on excitons in Cu2O, we examine the interconversion between the angular-momentum triplet-state excitons and the angular-momentum singlet-state excitons by a spin-exchange process which has been overlooked in the past. We estimate the rate of this particle-conserving mechanism and find a substantially higher value than the Auger process considered so far. Based on this idea, we give a possible explanation of the recent experimental observations, and make certain predictions, with the most important being that the singlet-state excitons in Cu2O is a very serious candidate for exhibiting the phenomenon of Bose-Einstein condensation.
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