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Static and ultrafast dynamics of defects of SrTiO3 in LaAlO 3 / SrTiO3 heterostructuresPublished in
2011
DOI: 10.1063/1.3554705
Volume: 98
Issue: 8
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.
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Content may be subject to copyright.This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publ... ...This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in [Static and ultrafast dynamics of defects of SrTiO3 in LaAlO3/SrTiO3 heterostructures. Applied Physics Letters 98, 8 p081916 (2011)] and may be found at https://doi.org/10.1063/1.3554705.
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