Static and ultrafast dynamics of defects of SrTiO3 in LaAlO 3 / SrTiO3 heterostructures

Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.3554705

Title:	Static and ultrafast dynamics of defects of SrTiO3 in LaAlO 3 / SrTiO3 heterostructures
Authors:	Wang, X. Chen, J.Q. Roy Barman, A. Dhar, S. Xu, Q.-H. Venkatesan, T. Ariando
Issue Date:	21-Feb-2011
Citation:	Wang, X., Chen, J.Q., Roy Barman, A., Dhar, S., Xu, Q.-H., Venkatesan, T., Ariando (2011-02-21). Static and ultrafast dynamics of defects of SrTiO3 in LaAlO 3 / SrTiO3 heterostructures. Applied Physics Letters 98 (8) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3554705
Abstract:	A detailed defect energy level map was investigated for heterostructures of 26 unit cells of LaAlO3 on SrTiO3 prepared at a low oxygen partial pressure of 10-6 mbar. The origin is attributed to the presence of dominating oxygen defects in SrTiO3 substrate. Using femtosecond laser spectroscopy, the transient absorption and relaxation times for various transitions were determined. An ultrafast relaxation process of 2-3 ps from the conduction band to the closest defect level and a slower process of 70-92 ps from conduction band to intraband defect level were observed. The results are discussed on the basis of the proposed defect-band diagram. © 2011 American Institute of Physics.
Source Title:	Applied Physics Letters
URI:	http://scholarbank.nus.edu.sg/handle/10635/83068
ISSN:	00036951
DOI:	10.1063/1.3554705
Appears in Collections:	Staff Publications

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