External modulation and application of topological states in topological crystal insulators
Project/Area Number |
18H01857
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 29010:Applied physical properties-related
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Research Institution | University of Tsukuba |
Principal Investigator |
KURODA Shinji 筑波大学, 数理物質系, 教授 (40221949)
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Co-Investigator(Kenkyū-buntansha) |
木村 昭夫 広島大学, 先進理工系科学研究科(理), 教授 (00272534)
秋山 了太 東京大学, 大学院理学系研究科(理学部), 助教 (40633962)
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Project Period (FY) |
2018-04-01 – 2021-03-31
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Project Status |
Completed (Fiscal Year 2020)
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Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2020: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2018: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
|
Keywords | トポロジカル絶縁体 / トポロジカル結晶絶縁体 / 鏡映対称性 / 格子歪 / トポロジカル表面状態 / ディラック・コーン / 界面誘起磁化 / レーザー励起ARPES |
Outline of Final Research Achievements |
In this study, we intend to reveal the peculiar physical properties arising from the topological surface states in SnTe and mixed crystals (Pb,Sn)Te, typical materials of topological crystalline insulators, with an emphasis on how external perturbations which break the mirror reflection symmetry of the crystals. We have investigated the unoccupied electronic states by performing time-resolved angle-resolved photoemission spectroscopy measurement on SnTe and (Pb,Sn)Te thin films grown by molecular beam epitaxy and have observed the whole structure of Dirac cones and the Rashba splitting of bulk valence-band. In addition, we have investigated the depth profile of magnetization in heterostructures of SnTe and a ferromagnet by measuring spin-polarized neutron reflectance, revealing magnetization induced at the interface via the topological surface states.
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Academic Significance and Societal Importance of the Research Achievements |
トポロジカル結晶絶縁体においては、結晶の鏡映対称性によりトポロジカル表面状態が保護されており、鏡映対称性を破る摂動が表面状態にどのような影響を与えるかは興味ある課題である。本研究では、トポロジカル結晶絶縁体の代表物質であるSnTeおよび混晶の(Pb,Sn)Teにおいて非占有側の表面状態の観察および強磁性体との接合界面での磁化誘起の検出という成果を得ており、格子歪および磁化の発現という摂動が表面状態に与える影響を明らかにしたという点で意義ある成果であると言える。
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Report
(4 results)
Research Products
(37 results)
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[Journal Article] Fabrication of a novel magnetic topological heterostructure and temperature evolution of its massive Dirac cone2020
Author(s)
T. Hirahara, M. M. Otrokov, T. T. Sasaki, K. Sumida, Y. Tomohiro, S. Kusaka, Y. Okuyama, S. Ichinokura, M. Kobayashi, Y. Takeda, K. Amemiya, T. Shirasawa, S. Ideta, K. Miyamoto, K. Tanaka, S. Kuroda, T. Okuda, K. Hono, S. V. Eremeev E. V. Chulkov
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Journal Title
Nature Communications
Volume: 11
Issue: 1
Pages: 4821-4821
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] 磁性トポロジカル絶縁体ヘテロ構造Mn,Te/Bi2Te3における磁性と構造2019
Author(s)
平原徹, 日下翔太郎, 深澤拓郎, 一ノ倉聖, 小林正起, 竹田幸治, 佐々木泰祐, 宝野和博, 白澤徹郎, 友弘雄太, 黒田眞司
Organizer
日本物理学会 2019年秋季大会
Related Report
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[Presentation] Interfacial Magnetism Induced on the Surface of Topological Crystalline Insulator SnTe due to the Proximity Effect2019
Author(s)
Y. Tomohiro, T. Shimano, R. Ishikawa, R. Nakanishi, K. Watanabe, K. Akutsu, K. Iida, M. Mitome, R. Akiyama, S. Hasegawa, S. Kuroda
Organizer
第23回半導体スピン工学の基礎と応用
Related Report
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