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FUJIMOTO　Junji
Mathematics, Electronics and Informatics DivisionAssistant Professor
Department of Electrical Engineering,Electronics, and Applied Physics

Researcher information

■ Degree
  • Doctor of Science, Osaka
    Mar. 2015
■ Field Of Study
  • Nanotechnology/Materials, Nano/micro-systems
  • Natural sciences, Magnetism, superconductivity, and strongly correlated systems

Performance information

■ Paper
■ MISC
  • Intrinsic spin Nernst effect in topological Dirac and magnetic Weyl semimetals
    Taiki Matsushita; Akihiro Ozawa; Yasufumi Araki; Junji Fujimoto; Masatoshi Sato
    20 Sep. 2024
    We investigate the intrinsic spin Nernst effect (SNE), a transverse spin
    current induced by temperature gradients, in topological Dirac semimetals
    (TDSMs) and magnetic Weyl semimetals (MWSMs) with Ising spin-orbit coupling.
    The intrinsic SNE is described by the spin Berry curvature, which reflects the
    geometric nature of TDSMs and MWSMs. We clarified that the intrinsic SNE
    becomes significant when the Fermi energy is near, but slightly deviates from,
    the energy of the point nodes. In this situation, Bloch electrons with strong
    spin Berry curvature contribute to the SNE while avoiding carrier compensation
    between electrons and holes. We found that in TDSMs with small Fermi surfaces,
    the spin Nernst angle, which measures the efficiency of the SNE, is larger than
    that observed in heavy metals. This suggests that TDSMs with small Fermi
    surfaces can achieve efficient heat-to-spin current conversion. In MWSMs,
    variation in the magnitude of the exchange coupling with magnetic moments
    significantly changes the SNE, affecting both the direction and magnitude of
    the spin Nernst current. This implies that ferromagnetic transitions can be
    used to reverse the spin Nernst current. These results provide the fundamentals
    for future topological spin caloritronics.
    arXiv ID：arXiv:2409.13225
■ Lectures, oral presentations, etc.
  • 9pAX-1 Anomalous Hall effect in Weyl semimetal　　　　　　　　　　　　　　　
    FUJIMOTO Junji; KOHNO Hiroshi
    Meeting abstracts of the Physical Society of Japan, Aug. 2014, The Physical Society of Japan (JPS)
    Aug. 2014 - Aug. 2014, Japanese
  • 27aPS-27 Effects of Vertex Corrections on Transport Coefficients of a Dirac Ferromagnet　　　　　　　　　　　　　　　
    FUJIMOTO Junji; KOHNO Hiroshi
    Meeting abstracts of the Physical Society of Japan, Mar. 2014, The Physical Society of Japan (JPS)
    Mar. 2014 - Mar. 2014, Japanese
  • Gilbert damping torque of Dirac ferromagnet　　　　　　　　　　　　　　　
    FUJIMOTO Junji; KOHNO Hiroshi
    Meeting abstracts of the Physical Society of Japan, Aug. 2013, The Physical Society of Japan (JPS)
    Aug. 2013 - Aug. 2013, Japanese
  • 26aPS-10 Oder Parameters of Dirac Ferromagnet : Analysis by Self-consistent Equation　　　　　　　　　　　　　　　
    FUJIMOTO Junji; KOHNO Hiroshi
    Meeting abstracts of the Physical Society of Japan, Mar. 2013, The Physical Society of Japan (JPS)
    Mar. 2013 - Mar. 2013, Japanese
  • 20pCC-7 Transport Properties of a Dirac Ferromagnet II　　　　　　　　　　　　　　　
    FUJIMOTO Junji; KOHNO Hiroshi
    Meeting abstracts of the Physical Society of Japan, Aug. 2012, The Physical Society of Japan (JPS)
    Aug. 2012 - Aug. 2012, Japanese
  • 25aSA-13 Transport Properties of a Dirac Ferromagnet　　　　　　　　　　　　　　　
    FUJIMOTO Junji; KOHONO Hiroshi
    Meeting abstracts of the Physical Society of Japan, Mar. 2012, The Physical Society of Japan (JPS)
    Mar. 2012 - Mar. 2012, Japanese
  • 26pBD-12 Ultraviolet Divergence in the Impurity Effect in 2D Dirac Electron System　　　　　　　　　　　　　　　
    Fujimoto J.; Sakai A.; Kohno H.
    Meeting abstracts of the Physical Society of Japan, Mar. 2012, The Physical Society of Japan (JPS)
    Mar. 2012 - Mar. 2012, Japanese
  • 26pPSA-30 Dirac Liquid : Perturbation Theory in 2nd-Order　　　　　　　　　　　　　　　
    Fujimoto Junji; Fuseya Yuki; Miyake Kazumasa
    Meeting abstracts of the Physical Society of Japan, Mar. 2011, The Physical Society of Japan (JPS)
    Mar. 2011 - Mar. 2011, Japanese
■ Teaching experience
  • Sep. 2022 - Present
    Exercises in Physical Mathematics, Saitama University
■ Affiliated academic society
  • Jan. 2023 - Present, The Japan Society of Applied Physics
  • 2011 - Present, The Physical Society of Japan
■ Research projects
  • Nonreciprocity due to spin-vorticity coupling in solids　　　　　　　　　　　　　　　
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 01 Apr. 2024 - 31 Mar. 2027
    Institute of Physical and Chemical Research
    Grant amount(Total)：18200000, Direct funding：14000000, Indirect funding：4200000
    Grant number：24K00576
    論文ID：48688467
  • Effects of electric current vorticity on magnetism　　　　　　　　　　　　　　　
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Early-Career Scientists, 01 Apr. 2022 - 31 Mar. 2025
    The University of Tokyo
    Grant amount(Total)：4030000, Direct funding：3100000, Indirect funding：930000
    Grant number：22K13997
    論文ID：48688467
  • ディラック方程式に基づく強磁性体の理論的研究　　　　　　　　　　　　　　　
    01 Apr. 2013 - 31 Mar. 2015
    Grant amount(Total)：2200000, Direct funding：2200000
    Grant number：13J03750
■ media coverage
  • 理研ら、新たな「スピン流－電流変換現象」を発見　　　　　　　　　　　　　　　
    16 Apr. 2021, [Internet]
  • スピン流で電流の渦つくる　　　　　　　　　　　　　　　
    14 Apr. 2021, [Paper]
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