Ultrafast dynamics in ZnO/ZnMgO multiple quantum wells
Wen, XiaoMing; Davis, Jeff A; McDonald, David; Dao, Lap Van; Hannaford, Peter; Coleman, Victoria A; Jagadish, Chennupati; Koike, Kazuto; Sasa, Shigehiko; Inoue, Masataka; Yano, Mitsuaki; Tan, Hark Hoe
We have investigated carrier relaxation and exciton recombination dynamics in ZnO/ZnMgO multiple quantum wells using femtosecond pump-probe techniques at room temperature. For a probe energy above the band gap, the hot carriers exhibit an effective relaxation by longitudinal optical phonon scattering with a cooling time of 700-850 fs. By detecting the emission near the band-gap, a longer decay time of a few picoseconds was observed which is attributed to acoustic phonon scattering. As the probe...[Show more]
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