Phase diagram of a polariton laser from cryogenic to room temperature

The signature of the strong-coupling regime is unambiguously evidenced in a GaN-based microcavity (MC) above the polariton lasing threshold P-thr at room temperature through the observation of the upper polariton branch. The MC system exhibits a renormalization of the polariton dispersion curve, namely, a reduced normal-mode splitting compared to the low-density regime. Next the dependence of P-thr as a function of exciton-photon detuning is investigated in the 4-340 K temperature range, which allows accessing the polariton lasing phase diagram. The observation of polariton lasing over such a broad range of temperatures reveals a clear transition from a kinetic to a thermodynamic regime with increasing temperature.


Published in:
Physical Review B, 80, 23, 3301
Year:
2009
ISSN:
1098-0121
Keywords:
Laboratories:




 Record created 2010-10-05, last modified 2018-03-17


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