Investigations of topological materials by advanced spectroscopic nano-probe measurements

• Project Area: Frontiers of materials science spun from topology
• Project/Area Number: 16H00978
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: University of Tsukuba
• Principal Investigator: 野村 晋太郎 筑波大学, 数理物質系, 准教授 (90271527)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 局所磁場測定法 / トポロジカル物質

Outline of Annual Research Achievements

新規開発したダイヤモンドNVセンターを用いた局所磁場測定システム磁場の空間分解測定に関する研究を実施した。広視野光学顕微鏡を用いてダイヤモンドNVセンターESRイメージングに成功し、高速sCMOSカメラを用いた独自の方式の広視野マイクロ波周波数変調イメージングにより磁場分解能が向上することを示した。温度可変クライオスタット中のトポロジカル候補物質を評価するためのダイヤモンドNVセンターESRイメージングシステムを構築した。ヘリウムクライオスタット試料ステージのマイクロ波照射による温度上昇を最小限とするため、A02班柏谷氏と共同で2.9 GHzにインピーダンスマッチングしたマイクロ波アンテナを設計、製作し、クライオスタットの外部から試料にマイクロ波を照射するシステムを開発し、超高感度磁場測定に十分な性能を達成した。トポロジカル絶縁体薄膜に外部磁場を印加して磁化させた後に、その磁化によって生じる磁場ベクトルを、４方向の結晶軸のNVセンターの電子スピン共鳴位置から再構成された。複数の試料温度において薄膜試料に水平、垂直方向の磁場を印加して磁化させたそれぞれの場合について、磁化により生じた磁場ベクトルを得た。その結果、バルクではc軸方向であった磁化ベクトルが薄膜ではc軸と垂直の面内方向であることが示された。さらにA01班前野氏、A02班柏谷氏と共同でSQUIDを用いたp波超伝導体Sr2RuO4-Ru共晶の渦糸の分布の研究を実施した。本研究で得られた成果は、新奇トポロジカル物質中の電流密度・磁場分布の空間分解測定を通じた新規な物性の開拓研究に寄与するものである。

Research Progress Status

29年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

29年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Photoresponse in h-BN/MoS2/h-BN thin-film transistor (2018)
  • Author(s): Akihisa Saito, Tomoki Ayano, and Shintaro Nomura
  • Journal Title: Jpn. J. Appl. Phys. Volume: 57 Issue: 4 Pages: 045201-045201
  • DOI: 10.7567/jjap.57.045201
  • NAID: 210000148831
  • Peer Reviewed
• [Journal Article] Investigation of the Vortex States of Sr2RuO4-Ru Eutectic Microplates Using DC-SQUIDs (2018)
  • Author(s): Y. Nago, D. Sakuma, R. Ishiguro, S. Kashiwaya, S. Nomura, K. Kono, Y. Maeno and H. Takayanagi
  • Journal Title: J. Phys.: Conf. Ser. Volume: 969 Pages: 12040-12040
  • DOI: 10.1088/1742-6596/969/1/012040
  • NAID: 210000134590
  • Peer Reviewed / Open Access
• [Journal Article] Investigation of the Vortex States of Sr2RuO4-Ru Eutectic Microplates Using DC-SQUIDs (2017)
  • Author(s): Sakuma Daisuke、Nago Yusuke、Ishiguro Ryosuke、Kashiwaya Satoshi、Nomura Shintaro、Kono Kimitoshi、Maeno Yoshiteru、Takayanagi Hideaki
  • Journal Title: Journal of the Physical Society of Japan Volume: 86 Issue: 11 Pages: 114708-114708
  • DOI: 10.7566/jpsj.86.114708
  • NAID: 210000134590
  • Peer Reviewed / Open Access
• [Journal Article] Frequency modulation technique for wide-field imaging of magnetic field with nitrogen-vacancy ensembles (2017)
  • Author(s): Y. Miura, S. Kashiwaya, and S. Nomura,
  • Journal Title: Jpn. J. Appl. Phys. Volume: 56
  • NAID: 120007128921
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Magnetic field imaging of a tungsten carbide film by scanning nano-SQUID microscope (2016)
  • Author(s): Y. Shibata, S. Nomura, R. Ishiguro, H. Kashiwaya, S. Kashiwaya, Y. Nago, and H. Takayanagi
  • Journal Title: Superconductor Science and Technology Volume: 29 Issue: 10 Pages: 104004-104004
  • DOI: 10.1088/0953-2048/29/10/104004
  • NAID: 120007129357
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Mappings of Magnetic Field and Current Density Using Nano Superconducting Quantum Interference Device Microscope (2016)
  • Author(s): Y. Shibata, S. Nomura, H. Kashiwaya, S. Kashiwaya, R. Ishiguro, Y. Nago, and H. Takayanagi
  • Journal Title: Ext. Abstr. Int. Conf. Solid State Devices and Materials Volume: - Pages: 535-536
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Local spin injection and detection for investigations of nanostructures and topological materials (2017)
  • Author(s): Shintaro Nomura
  • Organizer: International Workshop Top-Spin 3
  • Int'l Joint Research / Invited
• [Presentation] Magnetic field imaging for topological materials (2017)
  • Author(s): S. Nomura, Y. Miura, S. Nomoto, and S. Kashiwaya
  • Organizer: International Conference on Topological Materials Science
  • Int'l Joint Research
• [Presentation] Wide-field Magnetometry by Frequency Modulation of Microwaves Based on Nitrogen-vacancy Centers in Diamond (2017)
  • Author(s): Y. Miura, S. Nomoto, S. Kashiwaya, and S. Nomura
  • Organizer: SPINTECH IX
  • Int'l Joint Research
• [Presentation] Magnetization measurements of Sr2RuO4-Ru eutectic microplates using dc-SQUIDs (2017)
  • Author(s): Y. Nago , D. Sakuma, R. Ishiguro, S. Kashiwaya, S. Nomura, K. Kono, Y. Maeno, H. Takayanagi
  • Organizer: 28th International Conference on Low Temperature Physics
  • Int'l Joint Research
• [Presentation] Photocurrent in h-BN/MoS2/h-BN Heterostructures (2017)
  • Author(s): A. Saito, T. Ayano, and S. Nomura
  • Organizer: 22nd International Conference on Electronic Properties of Two Dimensional Systems
  • Int'l Joint Research
• [Presentation] Characterizations of a Hexagonal BN-encapsulated Multilayer MoS2 Photodetector (2017)
  • Author(s): T. Ayano, A. Saito, S. Nomura
  • Organizer: JSAP-OSA Joint Symposia 2017
  • Int'l Joint Research
• [Presentation] Optical magnetic field imaging on magnetic film with Nitrogen-Vacancy center in diamond (2017)
  • Author(s): Shuhei Nomoto, Ryusuke Kimura, Satoshi Kashiwaya, Shintaro Nomura
  • Organizer: Interdisciplinary Work Shop on Science and Patents 2017
  • Int'l Joint Research
• [Presentation] High photoresponsivity Hexagonal BN Encapsulated Multilayer MoS2 Photodetector (2017)
  • Author(s): T. Ayano, A. Saito, S. Nomura
  • Organizer: Interdisciplinary Work Shop on Science and Patents 2017
  • Int'l Joint Research
• [Presentation] ダイヤモンドNVセンターを用いた磁性体の広範囲磁気イメージング (2017)
  • Author(s): 野元嵩平，木村龍典，柏谷聡，野村晋太郎
  • Organizer: 日本物理学会
• [Presentation] MoS2/h-BN薄膜積層構造の光応答 (2017)
  • Author(s): 齋藤明央，綾野智貴，野村晋太郎
  • Organizer: 日本物理学会
• [Presentation] Circularly polarized near-field scanning optical microscope for characterization of nano-devices and nano-materials (2016)
  • Author(s): S. Nomura
  • Organizer: 2016 Global Research Efforts on Energy and Nanomaterials
  • Place of Presentation: GIS Taipei Tech Convention Center, Taipei, Taiwan
  • Year and Date: 2016-12-22
  • Int'l Joint Research / Invited
• [Presentation] Scanning nano-SQUID microscope for investigations of properties of two-dimensional layer of semiconductors and superconductors (2016)
  • Author(s): S. Nomura, Y. Shibata, H. Kashiwaya, S. Kashiwaya, R. Ishiguro, Y. Nago, and H. Takayanagi
  • Organizer: Workshop on Innovative Nanoscale Devices and Systems 2016
  • Place of Presentation: Hapuna Beach Prince Hotel, Kohaka coast, USA
  • Year and Date: 2016-12-04
  • Int'l Joint Research / Invited
• [Presentation] Mappings of Magnetic Field and Current Density Using Nano Superconducting Quantum Interference Device Microscope (2016)
  • Author(s): Y. Shibata, S. Nomura, H. Kashiwaya, S. Kashiwaya, R. Ishiguro, Y. Nago, and H. Takayanagi
  • Organizer: International Conference on Solid State Devices and Materials
  • Place of Presentation: 国際会議場、茨城県つくば市
  • Year and Date: 2016-09-26
  • Int'l Joint Research
• [Presentation] Wide-field imaging of magnetic field distribution with nitrogen-vacancy centers in diamond by frequency modulation of microwaves (2016)
  • Author(s): Y. Miura, S. Kashiwaya, and S. Nomura
  • Organizer: International Conference on Solid State Devices and Materials
  • Place of Presentation: 国際会議場、茨城県つくば市
  • Year and Date: 2016-09-26
  • Int'l Joint Research
• [Presentation] Magnetic field imaging with spin ensembles in diamond using frequency modulation of microwave (2016)
  • Author(s): Y. Miura, S. Kashiwaya, and S. Nomura
  • Organizer: The 22nd International Conference on High Magnetic Fields in Semiconductor Physics
  • Place of Presentation: Jozankei View Hotel, 北海道札幌市
  • Year and Date: 2016-07-25
  • Int'l Joint Research
• [Remarks] Nomura Laboratory
  • URL: http://www.px.tsukuba.ac.jp/~snomura/
• [Remarks] Nomura Laboratory, University of Tsukuba
  • URL: http://www.px.tsukuba.ac.jp/~snomura/