KAZUKI SUMIDA

Last Updated :2025/03/03

Affiliations, Positions
Research Institute for Synchrotron Radiation Science, Associate Professor (Special Appointment)
E-mail
sumidak1126hiroshima-u.ac.jp

Basic Information

Major Professional Backgrounds

  • 2025/01/01, Hiroshima University, Research Institute for Synchrotron Radiation Science, Associate Professor (Special Appointment)
  • 2024/04/01, 2024/12/31, Hiroshima University, Research Institute for Synchrotron Radiation Science, Assistant Professor (Special Appointment)
  • 2023/09/01, 2024/03/31, Hiroshima University, Hiroshima Synchrotron Radiation Center, Assistant Professor (Special Appointment)
  • 2020/04/01, 2023/08/31, Japan Atomic Energy Agency, Materials Sciences Research Center, Scientist
  • 2019/04/01, 2020/03/31, Japan Society for the Promotion of Science, JSPS Research Fellowship for Young Scientists PD
  • 2016/04/01, 2019/03/31, Japan Society for the Promotion of Science, JSPS Research Fellowship for Young Scientists DC1

Academic Degrees

  • Hiroshima University
  • Hiroshima University

Research Fields

  • Interdisciplinary science and engineering;Applied physics;Thin film / Surface and interfacial physical properties
  • Mathematical and physical sciences;Physics;Condensed matter physics II
  • Mathematical and physical sciences;Physics;Condensed matter physics I

Research Keywords

  • Synchrotron radiation, Laser, Topological materials, Magnetic materials, Surface science, spin- and angle-resolved photoemission spectroscopy, TIme- and angle-resolved photoemission spectroscopy, Molecular beam epitaxy, First-principles calculation

Affiliated Academic Societies

  • The Magnetics Society of Japan, 2020/09
  • The Japan Institute of Metals and Materials, 2017/05
  • The Japan Society of Applied Physics, 2016/01
  • The Japanese Society for Synchrotron Radiation Research, 2015/01
  • The Physical Society of Japan, 2013/12

Educational Activity

Course in Charge

  1. 2024, Graduate Education (Master's Program) , First Semester, Exercise in Physics I
  2. 2024, Graduate Education (Master's Program) , Second Semester, Exercise in Physics II
  3. 2024, Graduate Education (Master's Program) , First Semester, Special Exsecise in Physics A
  4. 2024, Graduate Education (Master's Program) , Second Semester, Special Exsecise in Physics B

Research Activities

Academic Papers

  1. ★, Surface-specific thermal spin-depolarization on the half-metallic Heusler films, Communications Physics, 8, 20250104
    Link to Paper Search Results by DOI
  2. Direct evidence of induced magnetic moment in Se and the role of misplaced Mn in MnBi2⁢Se4-based intrinsic magnetic topological insulator heterostructures, Physical Review Materials, 8, 20240815
    Link to Paper Search Results by DOI
  3. Laser-based angle-resolved photoemission spectroscopy with micrometer spatial resolution and detection of three-dimensional spin vector, Scientific Reports, 14, 20240104
    Link to Paper Search Results by DOI
  4. ★, Role of on-site Coulomb interactions in the half-metallic Weyl ferromagnet candidate thin-film Co2FeSi, Physical Review B, 108(24), 20231201
    Link to Paper Search Results by DOI
  5. Exploring spin-polarization in Bi-based high-Tc cuprates, Scientific Reports, 13(1), 20230818
    Link to Paper Search Results by DOI
  6. ★, One-Dimensional Band Structure in Quasi-Two-Dimensional eta-Mo4O11 Revealed by Angle-Resolved Photoelectron Spectroscopy and First-Principles Calculation, Journal of the Physical Society of Japan, 92(8), 20230815
    Link to Paper Search Results by DOI
  7. Ultrafast electron dynamics in a topological surface state observed in two-dimensional momentum space, Scientific Reports, 13(1), 20230409
    Link to Paper Search Results by DOI
  8. Electronic structure and topological properties of Co-based Heusler alloys probed by photoelectron spectroscopy, Kotai-Butsuri, 58(3), 20230315
  9. ★, Formation of monolayer V5Se8 from multilayer VSe2 films via V- and Se-desorption, Physical Review B, 106(19), 20221123
    Link to Paper Search Results by DOI
  10. Enhanced d−p hybridization intertwined with anomalous ground state formation in the van der Waals itinerant magnet Fe5GeTe2, Physical Review B, 106(4), 20220725
    Link to Paper Search Results by DOI
  11. Fabrication of (Bi2)m(Bi2Te3)n superlattice films by Te desorption from a pristine Bi2Te3 film, Applied Physics Letters, 120(17), 20220425
    Link to Paper Search Results by DOI
  12. ★, Short-range magnetic interaction in a monolayer 1T−VSe2 film revealed by element-specific x-ray magnetic circular dichroism, Physical Review Materials, 6(1), 20220124
    Link to Paper Search Results by DOI
  13. Three-dimensional bulk Fermi surfaces and Weyl crossings of Co2MnGa thin films underneath a protection layer, Physical Review B, 104(19), 20211108
    Link to Paper Search Results by DOI
  14. Absence of ferromagnetism in MnBi2Te4/Bi2Te3 down to 6 K, Physical Review B, 103(20), 20210504
    Link to Paper Search Results by DOI
  15. ★, Ultrafast surface Dirac fermion dynamics of Sb2Te3-based topological insulators, Progress in Surface Science, 96(2), 20210501
    Link to Paper Search Results by DOI
  16. Ultrafast Carrier Dynamics and Light-Induced Functionalizations of Topological Insulators, Butsuri, 75(12), 20201205
  17. ★, Spin-polarized Weyl cones and giant anomalous Nernst effect in ferromagnetic Heusler films, Communications Materials, 1(1), 20201124
    Link to Paper Search Results by DOI
  18. Fabrication of a novel magnetic topological heterostructure and temperature evolution of its massive Dirac cone, Nature Communications, 11(1), 20200924
    Link to Paper Search Results by DOI
  19. Unveiling spin-dependent unoccupied electronic states of Co2MnGe (Ga) film via Ge (Ga) L2,3 absorption spectroscopy, Physical Review B, 102(6), 20200826
    Link to Paper Search Results by DOI
  20. Topologically Nontrivial Phase-Change Compound GeSb2Te4, ACS Nano, 14(7), 20200728
    Link to Paper Search Results by DOI
  21. Spectroscopic evidence of quasi-one-dimensional metallic Rashba spin-split states on the Si(111)5x2-Au surface, Physical Review B, 101(4), 20200129
    Link to Paper Search Results by DOI
  22. Disentangling orbital and spin textures of surface-derived states in non-symmorphic semimetal HfSiS, Physical Review B, 100(20), 20191127
    Link to Paper Search Results by DOI
  23. Bidirectional surface photovoltage on a topological insulator, Physical Review B, 100(16), 20191031
    Link to Paper Search Results by DOI
  24. Element-specific density of states of Co2MnGe revealed by resonant photoelectron spectroscopy, Physical Review B, 100(16), 20191014
    Link to Paper Search Results by DOI
  25. ★, Magnetic-impurity-induced modifications to ultrafast carrier dynamics in the ferromagnetic topological insulators Sb2−x V x Te3, New Journal of Physics, 21(9), 20190904
    Link to Paper Search Results by DOI
  26. Negative Te spin polarization responsible for ferromagnetic order in the doped topological insulator V0.04(Sb1−xBix)1.96Te3, Physical Review B, 99(14), 20190416
    Link to Paper Search Results by DOI
  27. A general route to form topologically-protected surface and bulk Dirac fermions along high-symmetry lines, Electronic Structure, 1(1), 20190311
    Link to Paper Search Results by DOI
  28. ★, Inverted Dirac-electron population for broadband lasing in a thermally activated p-type topological insulator, Physical Review B, 99(8), 20190201
    Link to Paper Search Results by DOI
  29. Multiple topological states in iron-based superconductors, Nature Physics, 15(1), 20180924
    Link to Paper Search Results by DOI
  30. Prolonged photo-carriers generated in a massive-and-anisotropic Dirac material, Scientific Reports, 8(1), 20180613
    Link to Paper Search Results by DOI
  31. ★, Enhanced surface state protection and band gap in the topological insulator PbBi4Te4S3, Physical Review Materials, 2(10), 20181001
    Link to Paper Search Results by DOI
  32. Shubnikov–de Haas oscillations in p and n-type topological insulator (Bi x Sb1−x )2Te3, Journal of Physics: Condensed Matter, 30(26), 20180704
    Link to Paper Search Results by DOI
  33. Enhanced photovoltage on the surface of topological insulator via optical aging, Applied Physics Letters, 112(19), 20180507
    Link to Paper Search Results by DOI
  34. Ultrafast dynamics of an unoccupied surface resonance state in Bi2Te2Se, Physical Review B, 97(11), 20180308
    Link to Paper Search Results by DOI
  35. Direct evidence of hidden local spin polarization in a centrosymmetric superconductor LaO0.55 F0.45BiS2, Nature Communications, 8(1), 20171204
    Link to Paper Search Results by DOI
  36. ★, Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators, Scientific Reports, 7(1), 20171026
    Link to Paper Search Results by DOI
  37. Large-Gap Magnetic Topological Heterostructure Formed by Subsurface Incorporation of a Ferromagnetic Layer, Nano Letters, 17(6), 20170614
    Link to Paper Search Results by DOI
  38. Experimental realization of type-II Weyl state in noncentrosymmetric TaIrTe4, Physical Review B, 95(24), 20170612
    Link to Paper Search Results by DOI
  39. Surface Kondo effect and non-trivial metallic state of the Kondo insulator YbB12, Nature Communications, 7(1), 20160831
    Link to Paper Search Results by DOI
  40. Carrier-mediated ferromagnetism in the magnetic topological insulator Cr-doped (Sb,Bi)2Te3, Nature Communications, 6(1), 20151119
    Link to Paper Search Results by DOI
  41. Ultrafast electron dynamics at the Dirac node of the topological insulator Sb2Te3, Scientific Reports, 5(1), 20150821
    Link to Paper Search Results by DOI
  42. ★, Spectroscopic evidence of band Jahn-Teller distortion upon martensitic phase transition in Heusler-type Ni-Fe(Co)-Ga ferromagnetic shape-memory alloy films, Physical Review B, 91(13), 20150414
    Link to Paper Search Results by DOI

Awards

  1. 2025/01/10, 29th Encouragement Award, The Japanese Society for Synchrotron Radiation Research
  2. 2023/03/24, 17th Young Scientist Award, The Physical Society of Japan
  3. 2022/11/01, Outstanding Reviewer Award, Springer Nature, Communications Materials
  4. 2018/03/22, Student Prize (Division 9), 73rd Annual Meeting of the Physical Society of Japan
  5. 2018/03/05, Best Student Poster Award, The 1st International Workshop on Emergent Condensed Matter Physics
  6. 2017/09/21, Student Poster Award (Division 5), The Physical Society of Japan 2017 Fall Meeting
  7. 2017/01/25, Young Researcher Award, Symposium on Surface Science & Nanotechnology -25th Anniversary of SSSJ Kansai-
  8. 2015/11/28, Student Prize, SIS2015
  9. 2015/11/19, Best Student Poster Award, 15th International Conference on the Formation of Semiconductor Interfaces
  10. 2015/03/05, Best Student Poster Award, The 19th Hiroshima International Symposium on Synchrotron Radiation

External Funds

Acceptance Results of Competitive Funds

  1. KAKENHI, Realization of ultrafast conduction measurement by photoemission spectroscopy, 2024, 2027
  2. KAKENHI, Creation and elucidation of the electronic structure of the functional magnetic material Heuslerene, 2024, 2026
  3. KAKENHI, Search for novel topological quantum phases and elucidation of their electronic structures using multiple degrees of freedom in heavy electron systems, 2023, 2026
  4. KAKENHI, Elucidation of electronic structure and enhancement of thermoelectric power in Heusler-type Weyl magnetic thin films, 2021, 2023
  5. Grant-in-Aid for JSPS Fellows, Elucidation of the origin of room temperature ferromagnetism in two-dimensional van der Waals atomic layer thin films, 2019, 2021
  6. Grant-in-Aid for JSPS Fellows, Study of spin dynamics in Dirac electron systems using time- and spin-resolved photoelectron spectroscopy, 2016, 2018

Social Activities

History as Committee Members

  1. Program Committee Member, VUV SX High Brightness Light Source Users Roundtable Symposium, 2024/09, 2024/11
  2. Public relations committee, The Japanese Society for Synchrotron Radiation Research, 2021/10, 2023/09

Organizing Academic Conferences, etc.

  1. 6th Young Volunteer Research Meeting, The Japanese Society for Synchrotron Radiation Research, 2022/03