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|Title:||Defect dynamics and spectral observation of twinning in single crystalline LaAlO3 under subbandgap excitation||Authors:||Chen, J.Q.
Roy Barman, A.
|Issue Date:||24-Jan-2011||Citation:||Chen, J.Q., Wang, X., Lu, Y.H., Roy Barman, A., You, G.J., Xing, G.C., Sum, T.C., Dhar, S., Feng, Y.P., Ariando, Xu, Q.-H., Venkatesan, T. (2011-01-24). Defect dynamics and spectral observation of twinning in single crystalline LaAlO3 under subbandgap excitation. Applied Physics Letters 98 (4) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3543840||Abstract:||We have investigated the photoluminescence and ultrafast dynamics of LaAlO3 crystal. The photoluminescence consists of a broad spectrum and two sharp peaks, which arise from various defect levels within the bandgap. A doublet splitting of roughly 6 nm is seen in these two sharp peaks. An Al displacement of 0.09 Å in a sublattice, which is possible because of twinning, is adequate to explain the spectral splitting. Femtosecond pump probe experiments reveal further that many of these defect levels have a few picosecond decay times while the lowest defect states have decay times longer than nanosecond to the valence band. © 2011 American Institute of Physics.||Source Title:||Applied Physics Letters||URI:||http://scholarbank.nus.edu.sg/handle/10635/82117||ISSN:||00036951||DOI:||10.1063/1.3543840|
|Appears in Collections:||Staff Publications|
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