Ultrafast dynamics in ZnO/ZnMgO multiple quantum wells

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/25064

Title: Ultrafast dynamics in ZnO/ZnMgO multiple quantum wells
Author(s): Wen, X. M.; Davis, J. A.; McDonald, D.; Dao, L. V.; Hannaford, P.; Coleman, V. A.; Tan, H. H.; Jagadish, C.; Koike, K.; Sasa, S.; Inoue, M.; Yano, M.
Abstract: 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 energy is decreased further, the decay time continues to increase due to the transitions of exciton recombination or localized carrier recombination.
Publication type: Journal article
Research centre: Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy
Source: Nanotechnology, Vol. 18, no. 31 (2007)
Publication year: 2007
Publisher: IOP Publishing
ISSN: 0957-4484
Publisher URL: http://dx.doi.org/10.1088/0957-4484/18/31/315403
Peer reviewed