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

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

2000-01-31

arxiv.org/abs/cond-mat/0001438v1

Phys. Rev. B, 61 (2000) 16619

Physics

Condensed Matter

4 pages, RevTex, 1 ps figure

Scientific paper

10.1103/PhysRevB.61.16619

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.

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