Observation of a laserlike transition in a microcavity exciton polariton system
Abstract
We present experimental evidence of spontaneous buildup of coherent exciton polariton population in a microcavity, i.e., an exciton polariton laser. The laser phase transition was confirmed by the increased differential quantum efficiency and decreased linewidth of the lasing polariton mode due to onset of final-state stimulations and the decreased differential quantum efficiency of a nonlasing polariton due to onset of gain clamping at threshold. The exciton polariton laser is distinctly different from an optical laser because of its density-dependent scattering mechanism. The rate equations, taking into account phonon-assisted polariton emission and the polariton-reservoir exciton scattering rate, explain the measurement results well.
- Publication:
-
Physical Review A
- Pub Date:
- September 1996
- DOI:
- 10.1103/PhysRevA.54.R1789
- Bibcode:
- 1996PhRvA..54.1789P
- Keywords:
-
- 42.55.-f;
- 71.35.-y;
- 71.36.+c;
- 03.65.Bz;
- Lasers;
- Excitons and related phenomena;
- Polaritons