Threshold behavior in the collision broadening of microcavity polaritons
- 15 October 1998
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 58 (16), R10123-R10126
- https://doi.org/10.1103/physrevb.58.r10123
Abstract
The problem of the density-dependent homogeneous broadening of microcavity polaritons due to exciton-exciton Coulomb interaction is addressed using the self-consistent Born approximation. The theoretical results predict that, for resonant pumping of the lower polariton, the dependence of its broadening on the density of excitations has a threshold behavior. Below the threshold density, scattering is strongly inhibited because it involves only the small region of space where the polariton effective mass is very light. Above threshold, the region of space with excitonlike dispersion becomes allowed, giving the dominant contribution to the collision broadening.
Keywords
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