Auger decay, Spin-exchange, and their connection to Bose-Einstein condensation of excitons in Cu_2O

Abstract

In view of the recent experiments of O'Hara, et al. on excitons in Cu_2O, 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 Cu_2O is a very serious candidate for exhibiting the phenomenon of Bose-Einstein condensation.

4 pages, RevTex, 1 ps figure

References in corpus (1)

• Theory of Bose-Einstein condensation in trapped gases

Cited by in corpus (8)

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• Probing Bose-Einstein Condensation of Excitons with Electromagnetic Radiation
• Stress Dependence of Exciton Relaxation Processes in Cu2O
• Charge Density Wave Hampers Exciton Condensation in 1T-TiSe${}_2$
• Bose-Einstein condensation of excitons in Cu${}_2$O
• Unexpectedly Slow Two Particle Decay of Ultra-Dense Excitons in Cuprous Oxide