Study on transistor properties of topological insulator under pressure

• Project/Area Number: 18K18736
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 13:Condensed matter physics and related fields
• Research Institution: Okayama University
• Principal Investigator: Kubozono Yoshihiro 岡山大学, 異分野基礎科学研究所, 教授 (80221935)
• Project Period (FY): 2018-06-29 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000); Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2018: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 電界効果キャリアドープ / 電界効果トランジスタ / 超伝導 / 圧力 / 圧力誘起超伝導 / 高圧 / トランジスタ特性 / 電気抵抗 / 超伝導特性 / 高圧トラジスタ特性 / トポロジカル絶縁体 / 超高圧 / キャリアドーピング / キャリア濃度

Outline of Final Research Achievements

The research goal is to develop new superconducting materials via carrier doping of various topological insulators and to control the superconducting properties by applying pressure for their superconducting materials. Throughout this study, we have investigated the electric transport properties of Ag doped Bi2Se3 which was electrostatically carrier-doped by a fabrication of field-effect transistor (FET) device. Moreover, we have fully investigated the electric transport properties of Bi2-xSbxTe3-ySey in a wide pressure range, and discovered superconductivity under pressure. It should be noticed that the energy of Fermi level and Dirac point of Bi2-xSbxTe3-ySey could be tuned depending on x and y. The electric-double-layer (EDL) FET with thin crystals of Bi2-xSbxTe3-ySey have been fabricated and their transistor properties have been being investigated under pressure.

Academic Significance and Societal Importance of the Research Achievements

本研究の最終目標は、電界効果によってキャリアドープされたトポロジカル絶縁体で新規な超伝導体を作製して、更にそれに圧力を印加して超伝導特性を制御することである。そもそも、「電界効果キャリアドーピングされたトポロジカル物質に圧力を印加して超伝導を制御する」という研究は全く未開拓であって、まずは、どのように電界効果トランジスタを高圧で動作させるのかといった点を解決せねばならない。このように、本研究課題は前人未到の研究ともいえるものである。これが実現できれば、自在なキャリア制御と圧力による物性制御を組み合わせることが可能となり、物性物理学の飛躍的な進展をもたらすことになる。

Research Products

• [Int'l Joint Research] ナポリ大学/アンコーナ大 (UPDM)(イタリア)
• [Int'l Joint Research] ビュルツブルグ大学(ドイツ)
• [Int'l Joint Research] 台湾 放射光研究センター(その他の国・地域)
• [Int'l Joint Research] フェデリコII世・ナポリ大学(イタリア)
• [Int'l Joint Research] NSRRC(その他の国・地域)
• [Journal Article] Superconducting behavior of a new metal iridate compound, SrIr2, under pressure (2020)
  • Author(s): Xiaofan Yang, Huan Li, Tong He, Tomoya Taguchi, Yanan Wang, Hidenori Goto, Ritsuko Eguchi, Rie Horie, Kazumasa Horigane, Kaya Kobayashi, Jun Akimitsu, Hirofumi Ishii, Yen Fa Liao, Hitoshi Yamaoka, Yoshihiro Kubozono
  • Journal Title: Journal of Physics Condensed Matter Volume: 32 Issue: 2 Pages: 025704-025704
  • DOI: 10.1088/1361-648x/ab4605
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Synthesis of [7]phenacene incorporating tetradecyl chains in the axis positions and its application in field-effect transistors (2020)
  • Author(s): Hideki Okamoto, Shino Hamao, Keiko Kozasa, Yanan Wang, Yoshihiro Kubozono, Yong-He Pan, Yu-Hsiang Yen, Germar Hoffmann, Fumito Tani, Kenta Goto
  • Journal Title: Journal of Materials Chemistry C Volume: 8 Issue: 22 Pages: 7422-7435
  • DOI: 10.1039/d0tc00272k
  • NAID: 120007027581
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Fabrication of flexible high-performance organic field-effect transistors using phenacene molecules and their application toward flexible CMOS inverters (2019)
  • Author(s): Pompei Emanuela、Turchetti Claudio、Hamao Shino、Miura Akari、Goto Hidenori、Okamoto Hideki、Fujiwara Akihiko、Eguchi Ritsuko、Kubozono Yoshihiro
  • Journal Title: Journal of Materials Chemistry C Volume: 印刷中 Issue: 20 Pages: 6022-6033
  • DOI: 10.1039/c8tc05824e
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Pressure-induced superconductivity in Bi2-xSbxTe3-ySey (2019)
  • Author(s): Tong He, Xiaofan Yang, Tomoya Taguchi, Teppei Ueno, Kaya Kobayashi, Jun Akimitsu, Hitoshi Yamaoka, Hirofumi Ishii, Yen-Fa Liao, Hiromi Ota, Hidenori Goto, Ritsuko Eguchi, Kensei Terashima, Takayoshi Yokoya, Harald O. Jeschke, Xianxin Wu, Yoshihiro Kubozono
  • Journal Title: PHYSICAL REVIEW B Volume: 100 Issue: 9 Pages: 094525-094525
  • DOI: 10.1103/physrevb.100.094525
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Preparation and characterization of superconducting Ba1-xCsxTi2Sb2O, and its pressure dependence of superconductivity (2019)
  • Author(s): Wang Yanan, Yang Xiaofan, Taguchi Tomoya, Li Huan, He Tong, Goto Hidenori, Eguchi Ritsuko, Miyazaki Takafumi, Liao Yen-Fa, Ishii Hirofumi, Kubozono Yoshihiro
  • Journal Title: JAPANESE JOURNAL OF APPLIED PHYSICS Volume: 58 Issue: 11 Pages: 110603-110603
  • DOI: 10.7567/1347-4065/ab4ef5
  • NAID: 210000157392
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Superconducting properties of (NH3) y Li x FeSe0.5Te0.5 under pressure (2019)
  • Author(s): Yang Xiaofan、He Tong、Taguchi Tomoya、Li Huan、Wang Yanan、Goto Hidenori、Eguchi Ritsuko、Miyazaki Takafumi、Yamaoka Hitoshi、Ishii Hirofumi、Liao Yen-Fa、Kubozono Yoshihiro
  • Journal Title: New Journal of Physics Volume: 21 Issue: 11 Pages: 113010-113010
  • DOI: 10.1088/1367-2630/ab5034
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Synthesis of the extended phenacene molecules, [10]phenacene and [11]phenacene, and their performance in a field-effect transistor (2019)
  • Author(s): Okamoto Hideki、Hamao Shino、Eguchi Ritsuko、Goto Hidenori、Takabayashi Yasuhiro、Yen Paul Yu-Hsiang、Liang Luo Uei、Chou Chia-Wei、Hoffmann Germar、Gohda Shin、Sugino Hisako、Liao Yen-Fa、Ishii Hirofumi、Kubozono Yoshihiro
  • Journal Title: Scientific Reports Volume: 9 Issue: 1 Pages: 4009-4009
  • DOI: 10.1038/s41598-019-39899-4
  • NAID: 120006777515
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Fermi level tuning of Ag-doped Bi2Se3 topological insulator (2019)
  • Author(s): Uesugi Eri、Uchiyama Takaki、Goto Hidenori、Ota Hiromi、Ueno Teppei、Fujiwara Hirokazu、Terashima Kensei、Yokoya Takayoshi、Matsui Fumihiko、Akimitsu Jun、Kobayashi Kaya、Kubozono Yoshihiro
  • Journal Title: Scientific Reports Volume: 9 Issue: 1 Pages: 5376-5376
  • DOI: 10.1038/s41598-019-41906-7
  • NAID: 120006777514
  • Peer Reviewed / Open Access
• [Journal Article] Surface Structure of Organic Semiconductor [n]Phenacene Single Crystals (2018)
  • Author(s): Wakabayashi Yusuke、Nakamura Masanari、Sasaki Kaori、Maeda Takahiro、Kishi Yuutaro、Ishii Hiroyuki、Kobayashi Nobuhiko、Yanagisawa Susumu、Shimo Yuma、Kubozono Yoshihiro
  • Journal Title: Journal of the American Chemical Society Volume: 140 Issue: 43 Pages: 14046-14049
  • DOI: 10.1021/jacs.8b08811
  • Peer Reviewed / Open Access
• [Journal Article] Preparation and characterization of a new metal-intercalated graphite superconductor (2018)
  • Author(s): Yang Xiaofan、Taguchi Tomoya、Wang Yanan、He Tong、Uchiyama Takaki、Takai Akihisa、Zhi Lei、Miyazaki Takafumi、Goto Hidenori、Eguchi Ritsuko、Ishii Hirofumi、Liao Yen-Fa、Yamaoka Hitoshi、Kubozono Yoshihiro
  • Journal Title: Materials Research Express Volume: 6 Issue: 1 Pages: 016003-016003
  • DOI: 10.1088/2053-1591/aae9d2
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Pressure driven superconductivity in topological materials (2019)
  • Author(s): Yoshihiro Kubozono
  • Organizer: Superstripes 2019
  • Int'l Joint Research / Invited
• [Presentation] Pressure Driven Superconductivity in Topological Insulators (2019)
  • Author(s): Yoshihiro Kubozono
  • Organizer: MRM 2019
  • Int'l Joint Research
• [Presentation] Pressure-induced superconductivity in metal doped topological materials and two dimensional materials (2019)
  • Author(s): Y. Kubozono
  • Organizer: The first international workshop on Momentum Microscopy & Spectroscopy for Materials Science
  • Int'l Joint Research / Invited
• [Presentation] 分子吸着によるグラフェンの散乱効果 (2019)
  • Author(s): 高井彰久、後藤秀徳、内山貴生、Zhi Lei, 江口律子、久保園芳博
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] Pressure-induced superconductivity in metal-doped two-dimensional layered materials (2019)
  • Author(s): Xiaofan Yang, Tong He, Tomoya Taguchi, Yanan Wang, Huan Li, Hirofumi Ishii, Hitoshi Yamaoka, Hidenori Goto, Ritsuko Eguchi, Yoshihiro Kubozono
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] Carrier doping of graphene with electric-field effect and doping effect (2018)
  • Author(s): Hidenori Goto, Ritsuko Eguchi, Yoshihiro Kubozono
  • Organizer: EMRS 2018 Fall meeting
  • Int'l Joint Research
• [Presentation] Pressure-induced superconductivity in Ag-doped Bi2Se3 topological insulator (2018)
  • Author(s): Tong He, Kaya Kobayashi, Jun Akimitsu, Hidenori Goto, Yoshihiro Kubozono
  • Organizer: EMRS 2018 Fall meeting
  • Int'l Joint Research
• [Book] Physics ans Chemistry of Carbon-Based Materials: Basic and Applications (2019)
  • Author(s): Yoshihiro Kubozono
  • Total Pages: 332
  • Publisher: Springer
  • ISBN: 9789811334160
• [Book] Physics and Chemistry of Carbon-Based Materials (2019)
  • Author(s): Yoshihiro Kubozono (editor) / Chapter 8: Yoshihiro Kubozono
  • Publisher: Springer
• [Book] 3D local structure and Functional Design of Materials (2019)
  • Author(s): Hiroshi Daimon and Yuji C. Sasaki (eitor) / Chapter 8.1: Yoshihiro Kubozono, Hidenori Goto, Hiroko Yamda
  • Publisher: Maruzen pub. / World Scientific
• [Remarks]
  • URL: http://interfa.rlss.okayama-u.ac.jp/publication.html
• [Remarks] 岡山大学異分野基礎科学研究所超伝導・機能材料研究コア （Kubozono group)
  • URL: http://interfa.rlss.okayama-u.ac.jp/