Hot-phonon bottleneck in the photoinjected plasma in GaN

Vasconcellos, A. R.; Luzzi, R.; Rodrigues, C. G.; Freire, V. N.
April 2003
Applied Physics Letters;4/14/2003, Vol. 82 Issue 15, p2455
Academic Journal
The evolution on the picosecond scale of the macroscopic (nonequilibrium thermodynamic) state of a highly excited photoinjected plasma in bulk GaN is analyzed. We present the equations of evolution for the quasitemperature (level of excitation) of the hot carriers and of the optical phonons. A hot-phonon temperature overshoot is evidenced, as well as a preferential production of phonons in excess of equilibrium in a reduced off-center region of the Brillouin zone. A comparative analysis of the influence of the length of the exciting laser pulse is also performed.


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