KOUJI MIYAMOTO

Last Updated :2019/01/07

Affiliations, Positions
Hiroshima Synchrotron Radiation Center, ., Assistant Professor
E-mail
kmiyamotohiroshima-u.ac.jp

Basic Information

Major Professional Backgrounds

  • 2008/04/01, 2010/03/31, Hiroshima University, Hiroshima Synchrotron Radiation Center, Researcher
  • 2010/04/01, 2014/06/01, Hiroshima University, Hiroshima Synchrotron Radiation Center, Assistant Professor
  • 2014/07/01, 2015/05/31, Westf?lische Wilhelms-Universit?t, Researcher
  • 2015/06/01, Hiroshima University, Hiroshima Synchrotron Radiation Center, Assistant Professor

Educational Backgrounds

  • Hiroshima University, Graduate School of Science , Japan, 2005/04, 2008/03

Academic Degrees

  • Hiroshima University
  • Hiroshima University

Research Keywords

  • spin, electronic structure, spin-orbit interaction, magnetism

Affiliated Academic Societies

Educational Activity

Course in Charge

  1. 2018, Graduate Education (Master's Program) , First Semester, Synchrotron Radiation Materials Science Seminar
  2. 2018, Graduate Education (Master's Program) , Second Semester, Synchrotron Radiation Materials Science Seminar

Research Activities

Academic Papers

  1. Tunable spin current due to bulk insulating property in the topological insulator Tl1-xBi1+xSe2-delta, PHYSICAL REVIEW B, 91(20), 2015
  2. Valley spin polarization by using the extraordinary Rashba effect on silicon, NATURE COMMUNICATIONS, 4, 2013
  3. Topological Surface States with Persistent High Spin Polarization across the Dirac Point in Bi2Te2Se and Bi2Se2Te, PHYSICAL REVIEW LETTERS, 109(16), 2012
  4. Massless or heavy due to two-fold symmetry: Surface-state electrons at W(110), PHYSICAL REVIEW B, 86(16), 2012
  5. Negative spin polarization at the Fermi level in Fe4N epitaxial films by spin-resolved photoelectron spectroscopy, JOURNAL OF APPLIED PHYSICS, 112(1), 2012
  6. Observation of a highly spin-polarized topological surface state in GeBi2Te4, PHYSICAL REVIEW B, 86(19), 2012
  7. Spin-Polarized Dirac-Cone-Like Surface State with d Character at W(110), PHYSICAL REVIEW LETTERS, 108(6), 2012
  8. Experimental Verification of PbBi2Te4 as a 3D Topological Insulator, PHYSICAL REVIEW LETTERS, 108(20), 2012
  9. Giant Rashba-type spin splitting in bulk BiTeI, NATURE MATERIALS, 10(7), 521-526, 2011
  10. In-gap electronic states responsible for the excellent thermoelectric properties of Ni-based half-Heusler alloys, APPLIED PHYSICS EXPRESS, 1(8), 2008
  11. Direct evidence of ferromagnetism without net magnetization observed by x-ray magnetic circular dichroism, PHYSICAL REVIEW B, 70(13), 2004
  12. Orbital magnetic moment of "half-metallic" CO2MnGe, PHYSICA B-CONDENSED MATTER, 351(3-4), 347-350, 2004
  13. Soft X-ray spectroscopy study of Mn nanoclusters on Si(111)-7x7 surface, PHYSICA B-CONDENSED MATTER, 351(3-4), 351-354, 2004
  14. Element-resolved magnetic moments of Heusler-type ferromagnetic ternary alloy Co2MnGe, JOURNAL OF PHYSICS-CONDENSED MATTER, 16(48), S5797-S5800, 2004
  15. Temperature dependence of spin and orbital magnetic moments of Sm 4f electrons in (Sm, Gd)Al-2, JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 144, 749-752, 2005
  16. The performance test of spin-resolved photoelectron spectrometer at HSRC, JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 144, 997-999, 2005
  17. The self-calibration of a retarding-type Mott spin polarimeter with a large collection angle, REVIEW OF SCIENTIFIC INSTRUMENTS, 77(1), 2006
  18. Electronic structures of Fe3-xVxSi probed by photoemission spectroscopy, PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 203(11), 2765-2768, 2006
  19. Direct observation of spin splitting in bismuth surface states, PHYSICAL REVIEW B, 76(15), 2007
  20. Spin-dependent electronic band structure of Co/Cu(001) with different film thicknesses, JOURNAL OF PHYSICS-CONDENSED MATTER, 20(22), 2008
  21. Origin of the surface-state band-splitting in ultrathin Bi films: from a Rashba effect to a parity effect, NEW JOURNAL OF PHYSICS, 10, 2008
  22. Direct evidence of spin-polarized band structure of Sb(111) surface, APPLIED PHYSICS LETTERS, 93(25), 2008
  23. Absence of temperature dependence of the valence-band spectrum of Co2MnSi, PHYSICAL REVIEW B, 79(10), 2009
  24. Abrupt Rotation of the Rashba Spin to the Direction Perpendicular to the Surface, PHYSICAL REVIEW LETTERS, 102(9), 2009
  25. Hexagonally Deformed Fermi Surface of the 3D Topological Insulator Bi2Se3, PHYSICAL REVIEW LETTERS, 105(7), 2010
  26. Peculiar Rashba Splitting Originating from the Two-Dimensional Symmetry of the Surface, PHYSICAL REVIEW LETTERS, 103(15), 2009
  27. Strong Rashba-Type Spin Polarization of the Photocurrent from Bulk Continuum States: Experiment and Theory for Bi(111), PHYSICAL REVIEW LETTERS, 105(7), 2010
  28. Chemical potential shift of Fe3-xVxSi studied by hard x-ray photoemission, PHYSICAL REVIEW B, 78(20), 2008
  29. Spin polarized d surface resonance state of fcc Co/Cu(001), NEW JOURNAL OF PHYSICS, 10, 2008
  30. Large Rashba spin splitting of a metallic surface-state band on a semiconductor surface, NATURE COMMUNICATIONS, 1, 2010
  31. Experimental Realization of a Three-Dimensional Topological Insulator Phase in Ternary Chalcogenide TlBiSe2, PHYSICAL REVIEW LETTERS, 105(14), 2010
  32. Surface Scattering via Bulk Continuum States in the 3D Topological Insulator Bi2Se3, PHYSICAL REVIEW LETTERS, 107(5), 2011
  33. Spin-polarized semiconductor surface states localized in subsurface layers, PHYSICAL REVIEW B, 82(20), 2010
  34. Soft X-ray magnetic circular dichroism of Heusler-type alloy Co2MnGe, SOLID STATE COMMUNICATIONS, 128(5), 163-166, 2003
  35. Unoccupied topological surface state in Bi2Te2Se, PHYSICAL REVIEW B, 88(8), 2013
  36. Quasiparticle interference on the surface of Bi2Se3 induced by cobalt adatom in the absence of ferromagnetic ordering, PHYSICAL REVIEW B, 85(20), 2012
  37. Tuning of magnetic and transport properties in Bi2Te3 by divalent Fe doping, PHYSICAL REVIEW B, 87(20), 2013
  38. Perpendicular magnetic anisotropy with enhanced orbital moments of Fe adatoms on a topological surface of Bi2Se3, JOURNAL OF PHYSICS-CONDENSED MATTER, 25(23), 2013
  39. Electronic and spin structures of solids investigated by means of synchrotron radiation photoemission, RADIATION PHYSICS AND CHEMISTRY, 93, 14-20, 2013
  40. Experimental Evidence of Hidden Topological Surface States in PbBi4Te7, PHYSICAL REVIEW LETTERS, 111(20), 2013
  41. Experimental verification of the surface termination in the topological insulator TlBiSe2 using core-level photoelectron spectroscopy and scanning tunneling microscopy, PHYSICAL REVIEW B, 88(24), 2013
  42. Spin-Polarized Angle-Resolved Photoelectron Spectroscopy of the So-Predicted Kondo Topological Insulator SmB6, JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 83(1), 2014
  43. Exceptional behavior of d-like surface resonances on W(110): the one-step model in its density matrix formulation, NEW JOURNAL OF PHYSICS, 16, 2014
  44. Spin-Polarized Angle-Resolved Photoelectron Spectroscopy of the So-Predicted Kondo Topological Insulator SmB6 (vol 83, 014705, 2014), JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 83(3), 2014
  45. Photoelectron Spin-Polarization Control in the Topological Insulator Bi2Se3, PHYSICAL REVIEW LETTERS, 112(7), 2014
  46. The gigantic Rashba effect of surface states energetically buried in the topological insulator Bi2Te2Se, NEW JOURNAL OF PHYSICS, 16, 2014
  47. Valley-dependent spin polarization in bulk MoS2 with broken inversion symmetry, NATURE NANOTECHNOLOGY, 9(8), 611-617, 2014
  48. Direct observation of the spin polarization in Au atomic wires on Si(553), NEW JOURNAL OF PHYSICS, 16, 2014
  49. A double VLEED spin detector for high-resolution three dimensional spin vectorial analysis of anisotropic Rashba spin splitting, JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 201, 23-29, 2015
  50. Spin polarization of surface states on W(110): Combined influence of spin-orbit interaction and hybridization, JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 201, 53-59, 2015
  51. A double VLEED spin detector for high-resolution three dimensional spin vectorial analysis of anisotropic Rashba spin splitting, JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 201, 23-29, 201505
  52. Spin polarization of surface states on W(110): Combined influence of spin-orbit interaction and hybridization, JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 201, 53-59, 201505
  53. Lifshitz transition and Van Hove singularity in a three-dimensional topological Dirac semimetal, PHYSICAL REVIEW B, 92(7), 20150810
  54. Tunable spin helical Dirac quasiparticles on the surface of three-dimensional HgTe, PHYSICAL REVIEW B, 92(11), 20150922
  55. Spin-orbit influence on dz2-type surface state at Ta(110), PHYSICAL REVIEW B, 92(16), 20151019
  56. Orbital-symmetry-selective spin characterization of Dirac-cone-like state on W(110), PHYSICAL REVIEW B, 93(16), 20160408
  57. Nonvortical Rashba Spin Structure on a Surface with C-1h Symmetry, PHYSICAL REVIEW LETTERS, 117(1), 20160630
  58. Exchange coupling and spin structure in cobalt-on-chromia thin films, EPL, 115(1), 201607
  59. Hidden Rashba spin-split states in a quasi-one-dimensional Au atomic chain on ferromagnetic Ni(110), PHYSICAL REVIEW B, 94(24), 20161215
  60. Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd, NATURE COMMUNICATIONS, 7, 20161107
  61. Direct observation of spin-layer locking by local Rashba effect in monolayer semiconducting PtSe2 film, Nature Communications, 8, 20170131
  62. Large-Gap Magnetic Topological Heterostructure Formed by Subsurface Incorporation of a Ferromagnetic Layer, NANO LETTERS, 17(6), 3493-3500, 201706
  63. Adsorbate doping of MoS2 and WSe2: the influence of Na and Co, JOURNAL OF PHYSICS-CONDENSED MATTER, 29(28), 20170719
  64. Helical Phase Structure of Radiation from an Electron in Circular Motion, SCIENTIFIC REPORTS, 7, 20170721
  65. High quality atomically thin PtSe2 films grown by molecular beam epitaxy, 2D MATERIALS, 4(4), 201712
  66. Experimental realization of two-dimensional Dirac nodal line fermions in monolayer Cu2Si, NATURE COMMUNICATIONS, 8, 20171018
  67. Direct evidence of hidden local spin polarization in a centrosymmetric superconductor LaO0.55F0.45BiS2, NATURE COMMUNICATIONS, 8, 20171204
  68. Discovery of 2D Anisotropic Dirac Cones, ADVANCED MATERIALS, 30(2), 20180111
  69. Peculiar Rashba spin texture induced by C-3v symmetry on the Bi(111) surface revisited, PHYSICAL REVIEW B, 97(8), 20180223
  70. Location of the valence band maximum in the band structure of anisotropic 1T '-ReSe2, PHYSICAL REVIEW B, 97(16), 20180418
  71. Experimental observation of node-line-like surface states in LaBi, PHYSICAL REVIEW B, 97(15), 20180425
  72. Retrieving the initial-state spin polarization from spin-resolved photoemission: Proposal for a case study on W(110), PHYSICAL REVIEW B, 98(4), 20180717
  73. Circular-polarized-light-induced spin polarization characterized for the Dirac-cone surface state at W(110) with C-2v symmetry, SCIENTIFIC REPORTS, 8, 20180711

Awards

  1. 2014年, Young Scientist Award of thePhysical Society of Japan, The Physical Society of Japan
  2. 2014年, Award of the Japanese Society of Synchrotron Radiation Research, The Japanese Society of Synchrotron, Pioneering reserach of Dirac-typed-electrons system probed by spin- and angle-resolved photoemission spectroscopy
  3. 2013年, Encouraging Prize for the Best Young Scientist in the Surface Science Society of Japan meeting, The Surface Science of Japan, Anisotropic Dirac-cone-like spin-polarized surface state in W(110)

External Funds

Acceptance Results of Competitive Funds

  1. KAKEN, Grant-in-Aid for Young Scientists (B), Spin vectorial analysis of spin-polarized surface state with massless electrons: influence of cystal structure, 2013, 2014
  2. KAKENHI, 2016, 2018