Photo-induced in-gap states in SrTiO3 probed by photoemission spectroscopy under ultraviolet illumination

Takashi Mizokawa, Norihisa Takaiwa, Yukihiro Fujiwara, Takashi Iida, Kou Takubo, Jin Young Son, Tadahiko Ishikawa, Mitsuru Itoh, Masaki Takesada

研究成果: Article

8 引用 (Scopus)

抄録

We report on an electronic structure study of SrTiO3 under ultraviolet illumination. Photoemission measurements at 20K 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.

元の言語English
記事番号044703
ジャーナルJournal of the Physical Society of Japan
79
発行部数4
DOI
出版物ステータスPublished - 2010 4
外部発表Yes

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photoelectric emission
illumination
spectroscopy
ferroelectricity
photoconductivity
energy distribution
electrons
exponents
electronic structure
electronics

ASJC Scopus subject areas

  • Physics and Astronomy(all)

これを引用

Photo-induced in-gap states in SrTiO3 probed by photoemission spectroscopy under ultraviolet illumination. / Mizokawa, Takashi; Takaiwa, Norihisa; Fujiwara, Yukihiro; Iida, Takashi; Takubo, Kou; Son, Jin Young; Ishikawa, Tadahiko; Itoh, Mitsuru; Takesada, Masaki.

:: Journal of the Physical Society of Japan, 巻 79, 番号 4, 044703, 04.2010.

研究成果: Article

Mizokawa, T, Takaiwa, N, Fujiwara, Y, Iida, T, Takubo, K, Son, JY, Ishikawa, T, Itoh, M & Takesada, M 2010, 'Photo-induced in-gap states in SrTiO3 probed by photoemission spectroscopy under ultraviolet illumination', Journal of the Physical Society of Japan, 巻. 79, 番号 4, 044703. https://doi.org/10.1143/JPSJ.79.044703
Mizokawa, Takashi ; Takaiwa, Norihisa ; Fujiwara, Yukihiro ; Iida, Takashi ; Takubo, Kou ; Son, Jin Young ; Ishikawa, Tadahiko ; Itoh, Mitsuru ; Takesada, Masaki. / Photo-induced in-gap states in SrTiO3 probed by photoemission spectroscopy under ultraviolet illumination. :: Journal of the Physical Society of Japan. 2010 ; 巻 79, 番号 4.
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abstract = "We report on an electronic structure study of SrTiO3 under ultraviolet illumination. Photoemission measurements at 20K 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.",
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AU - Mizokawa, Takashi

AU - Takaiwa, Norihisa

AU - Fujiwara, Yukihiro

AU - Iida, Takashi

AU - Takubo, Kou

AU - Son, Jin Young

AU - Ishikawa, Tadahiko

AU - Itoh, Mitsuru

AU - Takesada, Masaki

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N2 - We report on an electronic structure study of SrTiO3 under ultraviolet illumination. Photoemission measurements at 20K 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.

AB - We report on an electronic structure study of SrTiO3 under ultraviolet illumination. Photoemission measurements at 20K 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.

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KW - Photoemission spectroscopy

KW - Pohoto-induced phase transition

KW - Quantum paraelectricity

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