Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1595082 | Solid State Communications | 2008 | 5 Pages |
Abstract
The lifetime of dense orthoexcitons in Cu2O is severely limited by dark molecule formation. In order to investigate this two-body process for orthoexciton-polaritons, we employ two-photon excitation and resonantly create orthoexciton-polaritons at 2Â K, which are the coherent quantum superposition of orthoexcitons and the light field. Based on the steady-state analysis, we find that this density-dependent process is an order of magnitude reduced for resonantly created orthoexciton-polaritons compared with thermalized orthoexcitons at 2Â K. This most likely arises from the photonic character of an orthoexciton-polariton. Considering the greatly reduced effective mass of the orthoexciton-polariton, this implies that the experimentally achievable orthoexciton-polariton densities can be above the critical density for Bose-Einstein condensation. However, insufficient elastic scattering seems to keep this propagating quantum ensemble from internal equilibrium.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
J.I. Jang, J.B. Ketterson,