Photo-Induced In-Gap States in SrTiO3 Probed by Photoemission Spectroscopy under Ultraviolet Illumination
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概要
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We report on an electronic structure study of SrTiO3 under ultraviolet illumination. Photoemission measurements at 20 K under ultraviolet illumination show that the illumination induces electronic states within the band gap. The photo-induced in-gap states show the power-law energy distribution with exponent of 3.4–3.7 and weakly depends on the strength of illumination. The photo-induced in-gap states indicate that most of the photo-excited electrons are trapped by local lattice distortions with various size scale. We argue that the free carriers in the Ti 3d band and the localized Ti 3d electrons and O 2p holes within the band gap contribute to the photoconductivity and the ferroelectricity under the ultraviolet illumination, respectively.
- 2010-04-15
著者
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Takubo Kou
Department Of Physics And Department Of Complexity Science And Engineering University Of Tokyo
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Son Jin-young
Department Of Physics And Department Of Complexity Science And Engineering University Of Tokyo
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Mizokawa Takashi
Department Of Complexity Science And Engineering And Department Of Physics University Of Tokyo
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Itoh Mitsuru
Materials & Structures Laboratory Tit
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Takesada Masaki
Department Of Physics Faculty Of Science Yamaguchi University
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Ishikawa Tadahiko
Department Of Applied Physics University Of Tokyo
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Iida Takashi
Departmenr Of Neuropathology Neurological Institute Graduate School Of Medical Sciences Kyushu Unive
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Son Jin-Young
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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Ishikawa Tadahiko
Department of Chemistry and Materials Science, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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Takaiwa Norihisa
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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Takesada Masaki
Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
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Takubo Kou
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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Fujiwara Yukihiro
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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Mizokawa Takashi
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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