2013 Fiscal Year Final Research Report
Evaluation of nano-space modulated structure on Tl compounds using optical second harmonic genaration
| Project/Area Number |
23560371
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Chiba Institute of Technology |
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Principal Investigator |
WAKITA Kazuki 千葉工業大学, 工学部, 教授 (80201151)
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| Co-Investigator(Kenkyū-buntansha) |
MIMURA Kojiro 大阪府立大学, 大学院工学研究科, 准教授 (40305652)
SHIM Yonggu 大阪府立大学, 大学院工学研究科, 助教 (20336803)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 光第二高調波 / タリウム系化合物 / 構造相転移 / ナノ変調構造 / 強誘電相 |
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| Research Abstract |
Optical second harmonic generation (SHG) has been studied in TlMeX2 (Me=In,Ga, X=S,Se,Te) compounds with layered and chain crystalline structures. For layered TlInS2 and TlGaSe2, SHG signal has been observed in a range of temperatures below the point of phase transition into ferroelectric phase for which asymmetry is prominent. On the other hand, the chain TlInSe2 and TlGaTe2 have shown SHG signal at a temperature above 270 and 293K, respectively. Both the TlInSe2 and TlGaTe2 have symmetry centre at room temperature and second order optical nonlinearity is an artefact incompatible with their bulk structure.
From the results of polarization properties on TlInS2 crystals, the point group coresponding to the crystal structure of ferroelectric phase is confirmed to be C3,2.
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Research Products
(12 results)
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[Journal Article] Electronic structures of ternary-layered semiconductor TlGaSe2 investigated by photoemission spectroscopy2013
Author(s)
Satoru Motonami, Kojiro Mimura, Yong-Gu Shim, Kazuki Wakita, Hitoshi Sato, Yuki Utsumi, Shigenori Ueda, Masashi Nakatake, Kenya Shimada, Yukihiro Taguchi, Keisuke Kobayashi, Hirofumi Namatame, Masaki Taniguchi, Guseyn Orudzhev, Nazim Mamedov
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Journal Title
Phys. Status Solidi C
Volume: vol. 10
Pages: 1001–1004
DOI
Peer Reviewed
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[Journal Article] Peculiar Linear Dispersive Bands Observed in Angle-Resolved Photoemission Spectra of Tl-Based Ternary Chalcogenide TlGaTe_22011
Author(s)
Kojiro Mimura, Takahiko Ishizu, Satoru Motonami, Kazuki Wakita, Masashi Arita, Sadig Hamidov, Zakir Chahangirli, Yukihiro Taguchi, Hirofumi Namatame, Masaki Taniguchi, Guseyn Orudzhev, Nazim Mamedov
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Journal Title
Japn. J. Appl. Phys
Volume: vol. 50
Pages: 05FC05-1-4
DOI
Peer Reviewed
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