Development and investigation of a ferromagnetic topological crystalline insulator with focusing on space inversion symmetry
| Project/Area Number |
26870086
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Akiyama Ryota 東京大学, 大学院理学系研究科(理学部), 助教 (40633962)
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| Research Collaborator |
KURODA Shinji
FUJISAWA Kazuki
YAMAGUCHI Tomonari
SAKURAI Ryutaro
ISHIKAWA Ryo
ITO Hiroshi
NAKANISHI Ryosuke
Fan Di
HASEGAWA Shuji
KIMURA Akio
SATO Hitoshi
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | トポロジカル絶縁体 / トポロジカル結晶絶縁体 / スピン軌道相互作用 / 2次元伝導 / メゾスコピック / 光電子分光 / 磁性 / MBE / 角度分解光電子分光 / 磁性半導体 / 狭ギャップ半導体 / ワイル半金属 / 時間反転対称性 / スピントロニクス / 半導体 / 弱反局在効果 / ディラックコーン / 強磁性 |
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| Outline of Final Research Achievements |
In this study, the aim is to investigate the relation between the crystal mirror symmetry and its topological surface state (TSS) in the topological crystalline insulators (TCIs) with doping the magnetic atoms. At first, we optimized the growth conditions of the high-quality single crystal thin films, and observed the weak antilocalization (WAL) effect, which was confirmed to be induced by the TSS. We successfully decrease the bulk carrier density by doping the compensation atom, Sb. The thin film becomes even n-type whereas the non-doped one shows p-type due to many Sn vacancies. Furthermore, the ARPES measurement revealed the Dirac cone derived from the TSS. Lastly with doping of Mn we made the ferromagnetic TCI. The WAL was also observed at the low- Mn-density sample. Thus , we demonstrated the coexistence of the ferromagnetism and the TSS. This means that the TSS can survive under the ferromagnetic interaction if such interaction is not so strong.
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Report
(4 results)
Research Products
(54 results)
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[Journal Article] Origin of the large positive magnetoresistance of Ge1－xMnx granular thin films2017
Author(s)
Y. K. Wakabayashi, R. Akiyama, Y. Takeda, M. Horio, G. Shibata, S. Sakamoto, Y. Ban, Y. Saitoh, H. Yamagami, A. Fujimori, M. Tanaka, and S. Ohya
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Journal Title
Physical Review B
Volume: 95
Issue: 1
Pages: 144171-6
DOI
Related Report
Peer Reviewed
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[Journal Article] Depositon and characterization of amorphous alminum nitride thin films for a gate insulator2015
Author(s)
H. Oikawa, R. Akiyama, K. Kanazawa, S. Kuroda, I. Harayama, K. Nagashima, D. Sekiba, Y. Ashizawa, A. Tsukamoto, K. Nakagawa, N. Ota
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Journal Title
Thin Solid Films
Volume: 574
Pages: 110-114
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Presentation] トポロジカル結晶絶縁体(Pb,Sn)Te薄膜のキャリア密度制御および表面状態観察2017
Author(s)
大滝祐輔, 山口智也, 石川諒, 黒田眞司, 中西亮介, D. Fan, 秋山了太, 長谷川修司, 宮本幸治, 佐藤仁, 木村昭夫
Organizer
2017年春季日本物理学会
Place of Presentation
大阪大学（大阪府豊中市）
Related Report
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[Presentation] トポロジカル結晶絶縁体(Pb,Sn)Te薄膜の角度分解光電子分光による表面状態観察2016
Author(s)
山口智也, 大滝祐輔, 石川諒, 黒田眞司, D. Fan, 秋山了太, 長谷川修司, 宮本幸治, 佐藤仁, 木村昭夫
Organizer
2016年秋季日本物理学会
Place of Presentation
金沢大学（石川県金沢市）
Related Report
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[Presentation] Rashba系表面構造(Tl, Pb)/Si(111)における二次元超伝導：in situ電気伝導測定2015
Author(s)
一ノ倉 聖, A.V. Matetskiy, L.V. Bondarenko, A.Y. Tupchaya, D.V. Gruznev, A.V. Zotov, 保原 麗, 秋山了太, 高山あかり, A.A. Saranin, 長谷川修司
Organizer
2015年秋季日本物理学会年次大会
Place of Presentation
大阪府吹田市 関西大学
Year and Date
2015-09-16
Related Report
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