Experimental evidence for nonequilibrium Bose condensation of exciton polaritons

Richard, M., Kasprzak, J., Andre, R., Romestein, R., Le Si Dang, D., Malpuech, G. and Kavokin, A. (2005) Experimental evidence for nonequilibrium Bose condensation of exciton polaritons. Physical Review B, 72 (20), 201301R-[4pp]. (doi:10.1103/PhysRevB.72.201301).

Abstract

We observe dramatic changes in the near-field and far-field emission from a semiconductor microcavity excited by a pulsed and nonresonant optical pump with varying power. Above a threshold pumping power, light is emitted by a single quantum state lying at the bottom of the lower exciton-polariton band. Its intensity increases exponentially with the pump power and its linewidth becomes narrower than the cavity mode width. Near-field spectroscopy shows that the stimulated emission comes from several bright spots in the cavity plane, but no diffraction-induced angular broadening of the emission is observed. This is direct evidence for spontaneous formation of a nonequilibrium Bose condensate of coherent exciton polaritons with their wave function sharply peaked at structural imperfections.

This record has no associated files available for download.

Contributors

Download statistics