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原子層物質のスピン物性

Publicly Offered Research

Project AreaScience of Atomic Layer Systems
Project/Area Number 26107505
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionTohoku University

Principal Investigator

野村 健太郎  東北大学, 金属材料研究所, 准教授 (00455776)

Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords原子層物質 / スピントロニクス / 物性理論 / 原子層
Outline of Annual Research Achievements

グラフェンをはじめとする原子層物質のスピン物性とくにスピンダイナミクスに関する研究を進めた。原子層物質はゲート電極による電子密度の制御性と磁性体との接合のしやすさから、スピントロニクスデバイスへの応用が期待されている。
2次元電子系に強磁性絶縁体を接合させた系において、強磁性体の磁化ベクトルが時間変動する際に2次元系に発生するスピン流の計算を行った。パラボリックバンドの場合には2次元電子の状態密度に比例するスピン流が得られた。ポテンシャルが急峻な場合と滑らかに変化する場合で、ほとんど違いは見られなかった。一方、グラフェンに関しては、発生するスピン流はポテンシャルが急峻の場合にはクライントンネリングによって、フェルミ準位の値によらず常に有限であったが、滑らかに変化するポテンシャルの下ではパラボリックバンドの場合と同様に、フェルミ準位によってはゼロとなる。
グラフェンの他に硫化モリブデンの伝導帯と価電子帯のバンド構造を模型として、強磁性体・電子層物質接合系におけるスピン緩和のメカニズムを理論的に調べた。線形応答理論を用いてギルバート緩和係数の微視的導出に成功した。特にMoS2の価電子帯のように強いスピン軌道相互作用がある場合には、ギルバート緩和係数が異方的になり、2桁の違いが見られる。これらはスピン軌道相互作用のある系におけるスピンポンピング現象を明らかにするものであり、今後の実験的研究を先導するものとなる。

Research Progress Status

27年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

27年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2015 Annual Research Report
  • 2014 Annual Research Report
  • Research Products

    (16 results)

All 2016 2015 2014

All Journal Article (9 results) (of which Peer Reviewed: 9 results,  Acknowledgement Compliant: 9 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 4 results,  Invited: 7 results)

  • [Journal Article] Chiral Magnetic Effect and Anomalous Hall Effect in Antiferromagnetic Insulators with Spin-Orbit Coupling2016

    • Author(s)
      A. Sekine, K. Nomura
    • Journal Title

      Phys. Rev. Lett.

      Volume: 116 Issue: 9

    • DOI

      10.1103/physrevlett.116.096401

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Spin textures and spin-wave excitations in doped Dirac-Weyl semimetals2016

    • Author(s)
      Y. Araki, K. Nomura
    • Journal Title

      Phys. Rev. B

      Volume: 93 Issue: 9 Pages: 094438-094438

    • DOI

      10.1103/physrevb.93.094438

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Finite-temperature effective boundary theory of the quantized thermal Hall effect2016

    • Author(s)
      R. Nakai, S. Ryu and K. Nomura
    • Journal Title

      New J. Phys.

      Volume: 18 Issue: 2 Pages: 023038-023038

    • DOI

      10.1088/1367-2630/18/2/023038

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Charge-Induced Spin Torque in Anomalous Hall Ferromagnets2015

    • Author(s)
      K. Nomura, D. Kurebayashi
    • Journal Title

      Phys. Rev. Lett.

      Volume: 115 Issue: 12 Pages: 127201-127201

    • DOI

      10.1103/physrevlett.115.127201

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Quantum thermal Hall effect of Majorana fermions on the surface of superconducting topological insulators2015

    • Author(s)
      Y. Shimizu, A. Yamakage, K. Nomura
    • Journal Title

      Phys. Rev. B

      Volume: 91 Issue: 19

    • DOI

      10.1103/physrevb.91.195139

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Stability of Multinode Dirac Semimetals against Strong Long-Range Correlations2014

    • Author(s)
      Akihiko Sekine and Kentaro Nomura
    • Journal Title

      Phys. Rev. B

      Volume: 90 Issue: 7

    • DOI

      10.1103/physrevb.90.075137

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Weyl semimetal phase in solid-solution narrow-gap semiconductors2014

    • Author(s)
      Daichi Kurebayashi, Kentaro Nomura
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 83 Issue: 6 Pages: 063709-063709

    • DOI

      10.7566/jpsj.83.063709

    • NAID

      40020091498

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Axionic Antiferromagnetic Insulator Phase in a Correlated and Spin-Orbit Coupled System2014

    • Author(s)
      Akihiko Sekine and Kentaro Nomura
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 83 Issue: 10 Pages: 104709-104709

    • DOI

      10.7566/jpsj.83.104709

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Spin-Electricity Conversion Induced by Spin Injection into Topological Insulators2014

    • Author(s)
      Y. Shiomi, K. Nomura, Y. Kajiwara, K. Eto, M. Novak, K. Segawa, Y. Ando and E. Saitoh
    • Journal Title

      Phys. Rev. Lett.

      Volume: 113 Issue: 19 Pages: 196601-196601

    • DOI

      10.1103/physrevlett.113.196601

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Recent development in Weyl semimetals2016

    • Author(s)
      Kentaro Nomura
    • Organizer
      Topological Science Kick-Off Symposium
    • Place of Presentation
      Keio University
    • Year and Date
      2016-03-14
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ワイル半金属におけるカイラル量子異常と電荷磁化結合2015

    • Author(s)
      野村健太郎
    • Organizer
      第9回物性科学領域横断研究会
    • Place of Presentation
      東京大学
    • Year and Date
      2015-11-13
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] Chiral anomaly and coupled charge-magnetization excitation in a Weyl semimetal2015

    • Author(s)
      Kentaro Nomura
    • Organizer
      International workshop: Mathematical Approach to Topological Phases in Spintronics
    • Place of Presentation
      Tohoku University
    • Year and Date
      2015-10-08
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ディラック電子系のスピン物性2015

    • Author(s)
      野村健太郎
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      関西大学
    • Year and Date
      2015-09-18
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] Spintronics in topological materials2015

    • Author(s)
      Kentaro Nomura
    • Organizer
      Novel Quantum Materials and Systems
    • Place of Presentation
      Lorentz Center, the Netherland
    • Year and Date
      2015-09-08
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Coupled charge and magnetization in a Weyl semimetal2015

    • Author(s)
      Kentaro Nomura
    • Organizer
      New Perspectives in Spintronic and Mesoscopic Physics
    • Place of Presentation
      Kashiwa
    • Year and Date
      2015-06-12
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Weyl semimetal phase in spin-orbit coupled semiconductors2014

    • Author(s)
      Kentaro Nomura
    • Organizer
      Novel Quantum States in Condensed Matter 2014
    • Place of Presentation
      京都大学
    • Year and Date
      2014-11-13
    • Related Report
      2014 Annual Research Report
    • Invited

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Published: 2014-04-04   Modified: 2018-03-28  

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