• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

New Quantum Thermoelectric Effects in Topological Semimetals under High Magnetic Fields

Research Project

Project/Area Number 20H01860
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionThe University of Tokyo

Principal Investigator

Osada Toshihito  東京大学, 物性研究所, 教授 (00192526)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2022: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2021: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2020: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Keywords量子熱電ホール効果 / トポロジカル半金属 / ディラック電子系 / 有機導体 / ノーダルライン半金属 / グラファイト / 強磁場 / 非線形異常ホール効果 / 熱電効果 / 強磁場極限
Outline of Research at the Start

本研究は強磁場量子極限下のトポロジカル半金属における新機構の熱電効果を調べるものである。特に2次元ディラック電子系のチャーン数ν=0の量子ホール状態で期待されるエッジ状態由来の熱電係数αxyの量子化現象(量子熱電ホール効果)を、層状有機導体α-(BEDT-TTF)2I3の量子ホール強磁性状態を用いて実証することを主目標とし、関連して3次元トポロジカル半金属(グラファイト、ZrSiS、WTe2等)の強磁場量子極限におけるn=0のランダウ準位由来の非飽和熱電能についても調べ、総合的な理解を目指す。さらに宇宙空間などの低温環境下でのエネルギー変換材料としての可能性も検討する。

Outline of Final Research Achievements

We conducted experimental and theoretical studies on the quantized thermoelectric Hall effect (QTHE) expected in topological semimetals under the high-magnetic-field quantum limit, using a two-dimensional massless Dirac fermion system α-(BEDT-TTF)2I3 and the three-dimensional semimetal graphite with straight nodal lines. In the former, we showed that QTHE is suppressed with traces due to the spin splitting of the ground Landau level. In the latter, we established the appearance of QTHE similar to Dirac/Weyl semimetals. Furthermore, we demonstrated the nonlinear anomalous Hall effect in the weak charge ordered state of α-(BEDT-TTF)2I3 and proposed its thermoelectric analogue, the nonlinear anomalous Ettingshausen effect.

Academic Significance and Societal Importance of the Research Achievements

冷却や発電などエネルギー変換に用いる熱電材料の探索は近年進んでいるが、宇宙空間などの低温環境でも使用可能な熱電材料は未知である。そのため低温でも有限の熱電性能を示すトポロジカル半金属の強磁場量子極限における量子熱電Hall効果(QTHE)が注目されてきた。本研究は2次元系ではスピン分裂がQTHEを抑制すること、3次元系ではnodal-line系にもQTHEが拡張できることを示したもので、QTHEの物理の基礎学術的理解を深めると共に、応用上の限界と材料選択の自由度についての新たな知見を与えた。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (30 results)

All 2023 2022 2021 2020 Other

All Journal Article (11 results) (of which Peer Reviewed: 11 results,  Open Access: 8 results) Presentation (18 results) (of which Invited: 1 results) Remarks (1 results)

  • [Journal Article] Nonlinear Topological Transport in Organic Dirac Fermion System2022

    • Author(s)
      長田 俊人、アンディカ・ キスワンディ
    • Journal Title

      Butsuri

      Volume: 77 Issue: 4 Pages: 233-238

    • DOI

      10.11316/butsuri.77.4_233

    • ISSN
      0029-0181, 2423-8872
    • Year and Date
      2022-04-05
    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Observation of possible nonlinear anomalous Hall effect in organic two-dimensional Dirac fermion system2022

    • Author(s)
      Kiswandhi Andhika、Osada Toshihito
    • Journal Title

      Journal of Physics: Condensed Matter

      Volume: 34 Issue: 10 Pages: 105602-105602

    • DOI

      10.1088/1361-648x/ac3fd5

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 有機ディラック電子系におけるトポロジカル輸送現象2022

    • Author(s)
      長田俊人
    • Journal Title

      固体物理

      Volume: 57 Pages: 227-240

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermoelectric Hall Effect at High-Magnetic-Field Quantum Limit in Graphite as a Nodal-Line Semimetal2022

    • Author(s)
      Osada Toshihito、Ochi Tomotaka、Taen Toshihiro
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 91 Issue: 6

    • DOI

      10.7566/jpsj.91.063701

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Weak localization on moire superlattice in twisted double bilayer graphene2022

    • Author(s)
      Kashiwagi Masaki、Taen Toshihiro、Uchida Kazuhito、Watanabe Kenji、Taniguchi Takashi、Osada Toshihito
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 61 Issue: 10 Pages: 100907-100907

    • DOI

      10.35848/1347-4065/ac934a

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Experimental Confirmation of Massive Dirac Fermions in Weak Charge-Ordering State in α-(BEDT-TTF)2I32021

    • Author(s)
      Yoshimura Kenta、Sato Mitsuyuki、Osada Toshihito
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 90 Issue: 3 Pages: 033701-033701

    • DOI

      10.7566/jpsj.90.033701

    • NAID

      210000158827

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Possible Nonlinear Anomalous Thermoelectric Effect in Organic Massive Dirac Fermion System2021

    • Author(s)
      Osada Toshihito、Kiswandhi Andhika
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 90 Issue: 5 Pages: 053704-053704

    • DOI

      10.7566/jpsj.90.053704

    • NAID

      40022563499

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Thermoelectric Effect at Quantum Limit in Two-Dimensional Organic Dirac Fermion System with Zeeman Splitting2021

    • Author(s)
      Osada Toshihito
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 90 Issue: 11 Pages: 113703-113703

    • DOI

      10.7566/jpsj.90.113703

    • NAID

      210000159372

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Possible Current-Induced Phenomena and Domain Control in an Organic Dirac Fermion System with Weak Charge Ordering2020

    • Author(s)
      Osada Toshihito、Kiswandhi Andhika
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 89 Issue: 10 Pages: 103701-103701

    • DOI

      10.7566/jpsj.89.103701

    • NAID

      40022375200

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Erratum: Possible Current-Induced Phenomena and Domain Control in an Organic Dirac Fermion System with Weak Charge Ordering [J. Phys. Soc. Jpn. 89, 103701 (2020)]2020

    • Author(s)
      Osada Toshihito、Kiswandhi Andhika
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 89 Issue: 12 Pages: 128002-128002

    • DOI

      10.7566/jpsj.89.128002

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High Pressure Thermal Measurements in Organic Dirac Fermion System2020

    • Author(s)
      鴻池貴子、内田和人、長田俊人
    • Journal Title

      The Review of High Pressure Science and Technology

      Volume: 30 Issue: 4 Pages: 274-280

    • DOI

      10.4131/jshpreview.30.274

    • NAID

      130008028889

    • ISSN
      0917-639X, 1348-1940
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Quantized thermoelectric Hall conductivity in straight nodal line semimetal: the case of graphite2023

    • Author(s)
      Andhika Kiswandhi,Tomotaka Ochi,Toshihiro Taen,Mitsuyuki Sato,Kazuhito Uchida, Toshihito Osada
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 強磁場領域における半金属薄膜の量子Sondheimer効果2023

    • Author(s)
      長田俊人,足立洋駿,田縁俊光,Andhika Kiswandhi
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 強磁場下において薄膜グラファイトが示す磁場に周期的な抵抗振動と膜厚依存性2023

    • Author(s)
      田縁俊光,Andhika Kiswandhi,長田俊人
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 質量のある有機ディラック電子系における非線形伝導2022

    • Author(s)
      長田俊人,柏木 聖生,アンディカ ・キスワンディ
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
  • [Presentation] 多層ディラック電子系での低温強磁場下熱電測定2022

    • Author(s)
      佐藤光幸,長田俊人
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Quantum thermoelectric Hall effect study on bulk graphite under magnetic field up to 10 T2022

    • Author(s)
      Andhika Kiswandhi,Toshihito Osada
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 薄膜グラファイトにおける磁場に周期的な抵抗振動と膜厚に対する依存性2022

    • Author(s)
      田縁俊光,長田俊人
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 有機ディラック電子系におけるトポロジカル輸送2022

    • Author(s)
      長田俊人
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Nonlinear Anomalous Transport in the Weak Charge Order Phase of α-(BEDT-TTF)2I32022

    • Author(s)
      Andhika Kiswandhi, Toshihito Osada
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 強磁場量子極限下のノーダルライン半金属における量子熱電効果2022

    • Author(s)
      長田俊人, 越智友崇
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 強磁場量子極限下のグラファイト薄膜における量子熱電効果の探索2022

    • Author(s)
      越智友崇, 長田俊人
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 捩れ積層グラフェンにおけるモアレ超格子中弱局在効果2022

    • Author(s)
      柏木聖生, 田縁俊光, 内田和人, 渡邊賢司, 谷口尚, 長田俊人
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 量子極限下の有機Dirac電子系α-(BEDT-TTF)2I3における量子熱電効果2021

    • Author(s)
      長田俊人
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Nonlinear Anomalous Hall Effect in α-(BEDT-TTF)2I3 under High Pressure2021

    • Author(s)
      Andhika Kiswandhi,Toshihito Osada
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 人工積層によって界面を導入したグラファイトの作製と輸送特性評価2021

    • Author(s)
      田縁俊光,長田俊人
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 質量のある有機ディラック電子系における非線形異常輸送現象2021

    • Author(s)
      長田俊人,アンディカ・キスワンディ
    • Organizer
      日本物理学会(第76回年次大会)
    • Related Report
      2020 Annual Research Report
  • [Presentation] Observation of Nonlinear Hall Effect in the Weak Charge Ordered State of α-(BEDT-TTF)2I32021

    • Author(s)
      Andhika Kiswandhi,Toshihito Osada
    • Organizer
      日本物理学会(第76回年次大会)
    • Related Report
      2020 Annual Research Report
  • [Presentation] 有機ディラック電子系におけるトポロジカル輸送現象2020

    • Author(s)
      長田俊人,アンディカ・キスワンディ
    • Organizer
      日本物理学会(2020年秋季大会)
    • Related Report
      2020 Annual Research Report
  • [Remarks] 長田研究室

    • URL

      https://osada.issp.u-tokyo.ac.jp/

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report 2020 Annual Research Report

URL: 

Published: 2020-04-28   Modified: 2024-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi