Activity List (as of July 12, 2025)

For the full publication list, click here. (pdf file, about 340kb)

  • Selected puplication list
  • Invited talks

    • Selected publication list

    Books

  • Shigemasa Suga, Akira Sekiyama and Christian Tusche: "Photoelectron Spectroscopy: Bulk and Surface Electronic Structures" (Second Edition) 511 pages in total (Springer Series in Surface Sciences Vol.72, Springer Nature Switzerland AG, 2021) ISBN: 978-3030640729
  • Akira Sekiyama: "Chapter 38: Hard X-ray Photoelectron Spectroscopy" in "Compendium of Surface and Interface Analysis" The Surface Science Society of Japan ed., p.229-238 (Springer, Singapore 2018) ISBN: 978-981-10-6156-1
  • Shigemasa Suga and Akira Sekiyama: "Photoelectron Spectroscopy: Bulk and Surface Electronic Structures" 378 pages in total (Springer Series in Optical Sciences Vol.176, Springer, Berlin Heidelberg 2013) ISBN: 978-3642375293

    • Papers

  • K. Yamagami, S. Imada, K. Yamanaka, T. Yaji, A. Tanaka, M. Kouno, N. Yoshinari, T. Konno and A. Sekiyama: "The Prominent Charge-Transfer Effects of Trinuclear Complexes with Nominally High Nickel Valences" J. Phys. Commun. 3, 125008-1-9 (2019).
  • R. Y. Umetsu, H. Fujiwara, K. Nagai, Y. Nakatani, M. Kawada, A. Sekiyama, F. Kuroda, H. Fujii, T. Oguchi, Y. Harada, J. Miyawaki and S. Suga: "Half-metallicity of the ferrimagnet Mn2VAl revealed by resonant inelastic soft x-ray scattering in a magnetic field" Phys. Rev. B 99, 134414-1-10 (2019).
  • A. Sekiyama, Y. Kanai, A. Tanaka and S. Imada: "Optical Process of Linear Dichroism in Angle-Resolved Core-Level Photoemission Reflecting Strongly Correlated Anisotropic Orbital Symmetry" J. Phys. Soc. Jpn. 88, 013706-1-4 (2019).
  • H. Aratani, Y. Nakatani, H. Fujiwara, M. Kawada Y. Kanai, K. Yamagami, S. Fujioka, S. Hamamoto, K. Kuga, T. Kiss, A. Yamasaki, A. Higashiya, T. Kadono, S. Imada, A. Tanaka, K. Tamasaku, M. Yabashi, T. Ishikawa, A. Yasui, Y. Saitoh, Y. Narumi, K. Kindo, T. Ebihara and A. Sekiyama: "Revising the 4f symmetry in CeCu2Ge2: Soft x-ray absorption and hard x-ray photoemission spectroscopy" Phys. Rev. B 98, 121113(R)-1-6 (2018).
  • Y. Nakatani, H. Aratani, H. Fujiwara, T. Mori, A. Tsuruta, S. Tachibana, T. Yamaguchi, T. Kiss, A. Yamasaki, A. Yasui, H. Yamagami, J. Miyawaki, T. Ebihara, Y. Saitoh and A. Sekiyama: "Evidence for momentum-dependent heavy-fermionic electronic structures: Soft x-ray ARPES for the superconductor CeNi2Ge2 in the normal state" Phys. Rev. B 97, 115160-1-7 (2018).
  • S. Hamamoto, S. Fujioka, Y. Kanai, K. Yamagami, Y. Nakatani, K. Nakagawa, H. Fujiwara, T. Kiss, A. Higashiya, A. Yamasaki, T. Kadono, S. Imada, A. Tanaka, K, Tamasaku, M. Yabashi, T. Ishikawa, K. T. Matsumoto, T. Onimaru, T. Takabatake and A. Sekiyama: "Linear Dichroism in Angle-Resolved Core-Level Photoemission Spectra Reflecting 4f Ground-State Symmetry of Strongly Correlated Cubic Pr Compounds" J. Phys. Soc. Jpn. 86, 123703-1-5 (2017).
  • M. Kouno, N. Yoshinari, N. Kuwamura, K. Yamagami, A. Sekiyama, M. Okumura and T. Konno: "Valence Interconversion of Octahedral Nickel(II/III/IV) Centers" Angew. Chem. Int. Ed. 56, 13762-13766 (2017).
  • H. Fujiwara, S. Naimen, A. Higashiya, Y. Kanai, H. Yomosa, K. Yamagami, T. Kiss, T. Kadono, S. Imada, A. Yamasaki, K. Takase, S. Otsuka, T. Shimizu, S. Shingubara, S. Suga, M. Yabashi, K. Tamasaku, T. Ishikawa and A. Sekiyama: "Polarized Hard X-ray Photoemission System with Micro-positioning Technique for Probing Ground State Symmetry of Strongly Correlated Materials" J. Synchrotron Rad. 23, 735-742 (2016).
  • (Selected as Editors' Choice) Y. Kanai, T. Mori, S. Naimen, K. Yamagami, H. Fujiwara, A. Higashiya, T. Kadono, S. Imada, T. Kiss, A. Tanaka, K. Tamasaku, M. Yabashi, T. Ishikawa, F. Iga and A. Sekiyama: "Evidence for Γ8 Ground-State Symmetry of Cubic YbB12 Probed by Linear Dichroism in Core-Level Photoemission" J. Phys. Soc. Jpn. 84, 073705-1-4 (2015).
  • T. Mori, S. Kitayama, Y. Kanai, S. Naimen, H. Fujiwara, A. Higashiya, K. Tamasaku, A. Tanaka, K. Terashima, S. Imada, A. Yasui, Y. Saitoh, K. Yamagami, K. Yano, T. Matsumoto, T. Kiss, M. Yabashi, T. Ishikawa, S. Suga, Y. Onuki, T. Ebihara and A. Sekiyama: "Probing Strongly Correlated 4f-Orbital Symmetry of the Ground State in Yb Compounds by Linear Dichroism in Core-Level Photoemission" J. Phys. Soc. Jpn. 83, 123702-1-5 (2014).
  • A. Sekiyama, A. Higashiya and S. Imada: "Polarization-dependent hard X-ray photoemission spectroscopy of solids" J. Electron Spectr. Relat. Phenom. 190, 201-204 (2013).
  • J. Yamaguchi, A. Sekiyama, M. Y. Kimura, H. Sugiyama, Y. Tomida, G. Funabashi, S. Komori, T. Balashov, W. Wulfhekel, T. Ito, S. Kimura, A. Higashiya, K. Tamasaku, M. Yabashi, T. Ishikawa, S. Yeo, S.-I. Lee, F. Iga, T. Takabatake and S. Suga: "Different evolution of the intrinsic gap in strongly correlated SmB6 in contrast to YbB12" New J. Phys. 15, 043042-1-12 (2013).
  • S. Suga, S. Itoda, A. Sekiyama, H. Fujiwara, S. Komori, S. Imada, M. Yabashi, K. Tamasaku, A. Higashiya, T. Ishikawa, M. Shang and T. Fujikawa: "Recoil effects for valence and core photoelectrons in V3Si" Phys. Rev. B 86, 035146-1-6 (2012).
  • H. Fujiwara, A. Sekiyama, S.-K. Mo, J. W. Allen, J. Yamaguchi, G. Funabashi, S. Imada, P. Metcalf, A. Higashiya, M. Yabashi, K. Tamasaku, T. Ishikawa and S. Suga: "Evidence for the constancy of U in the Mott transition of V2O3" Phys. Rev. B 84, 075117-1-5 (2011).
  • A. Sekiyama, J. Yamaguchi, A. Higashiya, M. Obara, H. Sugiyama, M. Y. Kimura, S. Suga, S. Imada, I. A. Nekrasov, M. Yabashi, K. Tamasaku and T. Ishikawa: "The prominent 5d-orbital contribution to the conduction electrons in gold" New J. Phys. 12, 043045-1-11 (2010).
  • J. Yamaguchi, A. Sekiyama, S. Imada, H. Fujiwara, M. Yano, T. Miyamachi, G. Funabashi, M. Obara, A. Higashiya, K. Tamasaku, M. Yabashi, T. Ishikawa, F. Iga, T. Takabatake and S. Suga: "Kondo lattice effects and the collapse of lattice coherence in Yb1-xLuxB12 studied by hard x-ray photoelectron spectroscopy" Phys. Rev. B 10, 125121-1-8 (2009).
  • Y. Okamoto, S. Niitaka, M. Uchida, T. Waki, M. Takigawa, Y. Nakatsu, A. Sekiyama, S. Suga, R. Arita and H. Takagi: "Band Jahn-Teller instability and formation of valence bond solid in a mixed-valent spinel oxide LiRh2O4" Phys. Rev. Lett. 101, 086404-1-4 (2008).
  • M. Tsunekawa, A. Sekiyama, S. Kasai, S. Imada, H. Fujiwara, T. Muro, Y. Onose, Y. Tokura and S. Suga: "Bulk electronic structures and strong electron-phonon interactions in an electron-doped high-temperature superconductor" New J. Phys. 10, 073005-1-11 (2008).
  • M. Yano, A. Sekiyama, H. Fujiwara, Y. Amano, S. Imada, T. Muro, M. Yabashi, K. Tamasaku, A. Higashiya, T. Ishikawa, Y. Onuki and S. Suga: "Electronic structure of CeRu2X2 (X=Si, Ge) in the paramagnetic phase studied by soft x-ray ARPES and hard x-ray photoelectron spectroscopy" Phys. Rev. B 77, 035118-1-8 (2008).
  • J. Yamaguchi, A. Sekiyama, S. Imada, A. Yamasaki, M. Tsunekawa, T. Muro, T. Ebihara, Y. Onuki and S. Suga: "Reduction of Kondo lattice effects in Yb1-xLuxAl3 observed by soft x-ray photoelectron spectroscopy" New J. Phys. 9, 317-1-9 (2007).
  • A. Yamasaki, S. Imada, H. Higashimichi, H. Fujiwara, T. Saita, T. Miyamachi, A. Sekiyama, H. Sugawara, D. Kikuchi, H. Sato, A. Higashiya, M. Yabashi, K. Tamasaku, D. Miwa, T. Ishikawa and S. Suga: "Coexistence of strongly mixed-valence and heavy-Fermion character in SmOs4Os12 studied by soft- and hard-X-ray spectroscopy" Phys. Rev. Lett. 98, 156402-1-4 (2007).
  • M. Yano, A. Sekiyama, H. Fujiwara, T. Saita, S. Imada, T. Muro, Y. Onuki and S. Suga: "Three-dimensional bulk Fermiology of CeRu2Ge2 in the paramagnetic phase by soft x-ray hν-dependent (700-860 eV) ARPES" Phys. Rev. Lett. 98, 036405-1-4 (2007).
  • S. Suga, A. Sekiyama, S. Imada, A. Shigemoto, A. Yamasaki, M. Tsunekawa, C. Dallera, L. Braicovich, T.-L. Lee, O. Sakai, T. Ebihara and Y. Onuki: "Kondo lattice effects of YbAl3 suggested by temperature dependence of high accuracy high energy photoelectron spectroscopy" J. Phys. Soc. Jpn. 74, 2880-2884 (2005).
  • S. Suga, S. Imada, A. Higashiya, A. Shigemoto, S. Kasai, M. Sing, H. Fujiwara, A. Sekiyama, A. Yamasaki, C. Kim, T. Nomura, J. Igarashi, M. Yabashi and T. Ishikawa: "Charge dynamics in strongly correlated one-dimensional Cu-O chain systems revealed by inelastic x-ray scattering" Phys. Rev. B 72, 081101(R)-1-4 (2005).
  • A. Sekiyama, H. Fujiwara, S. Imada, S. Suga, H. Eisaki, S. I. Uchida, K. Takegahara, H. Harima, Y. Saitoh, I. A. Nekrasov, G. Keller, D. E. Kondakov, A. V. Kozhevnikov, Th. Pruschke, K. Held, D. Vollhardt and V. I. Anisimov: "Mutual Experimental and Theoretical Validation of Bulk Photoemission Spectra of Sr1-xCaxVO3" Phys. Rev. Lett. 93, 156402-1-4 (2004).
  • A. Sekiyama, S. Kasai, M. Tsunekawa, Y. Ishida, M. Sing, A. Irizawa, A. Yamasaki, S. Imada, T. Muro, Y. Saitoh, Y. Onuki, T. Kimura, Y. Tokura, S. Suga: "Technique for bulk Fermiology by photoemission applied to layered ruthenates" Phys. Rev. B 70, 060506(R)-1-4 (2004).
  • S.-K. Mo, J. D. Denlinger, H.-D. Kim, J.-H. Park, J. W. Allen, A. Sekiyama, A. Yamasaki, K. Kadono, S. Suga, Y. Saitoh, T. Muro, P. Metcalf, G. Keller, K. Held, V. Eyert, V. I. Anisimov and D. Vollhardt: "Prominent quasiparticle peak in the photoemission spectrum of the metallic phase of V2O3" Phys. Rev. Lett. 90, 186403-1-4 (2003).
  • T. Iwasaki, A. Sekiyama, A. Yamasaki, M. Okazaki, K. Kadono, H. Utsunomiya, S. Imada, Y. Saitoh, T. Muro, T. Matsushita, H. Harima, S. Yoshii, M. Kasaya, A. Ochiai, T. Oguchi, K. Katoh, Y. Niide, K. Takegahara and S. Suga: "High-resolution resonance photoemission study of CeMX (M = Pt, Pd; X = P, As, Sb)" Phys. Rev. B 65, 195109-1-9 (2002).
  • A. Sekiyama, S. Suga, S. Ueda, S. Imada, K. Matsuda, T. Iwasaki, M. Hedo, E. Yamamoto, Y. Haga, Y. Onuki, Y. Saitoh, T. Matsushita, T. Nakatani, M. Kotsugi, S. Tanaka and H. Harima: "Itinerant bulk 4f character of strongly valence-fluctuating CeRu2 observed by high-resolution Ce 3d-4f resonance photoemission" Solid State Commun. 121, 561-564 (2002).
  • A. Sekiyama, K. Kadono, K. Matsuda, T. Iwasaki, S. Ueda, S. Imada, S. Suga, R. Settai, H. Azuma, Y. Onuki and Y. Saitoh: "Bulk 4f Electronic States of Ce-Based Heavy Fermion System Probed by High-Resolution Resonance Photoemission" J. Phys. Soc. Jpn. 69, 2771-2774 (2000).
  • A. Sekiyama, T. Iwasaki, K. Matsuda, Y. Saitoh, Y. Onuki and S. Suga: "Probing bulk states of correlated electron systems by high-resolution resonance photoemission" Nature 403, 396-398 (2000).
  • A. Sekiyama, S. Suga, Y. Saitoh, S. Ueda, H. Harada, T. Matsushita, T. Nakatani, T. Iwasaki, K. Matsuda, M. Kotsugi, S. Imada, T. Takabatake, T. Yoshino, D. T. Adroja, R. Takayama, O. Sakai, H. Harima and T. Nanba: "High resolution Ce 3d-4f resonant photoemission study of CeNiSn and CePdSn" Solid State Commun. 111, 373-378 (1999).
  • A. Sekiyama, S. Suga, M. Fujikawa, S. Imada, T. Iwasaki, K. Matsuda, T. Matsushita, K. V. Kaznacheyev, A. Fujimori, H. Kuwahara and Y. Tokura: "Electronic states of charge-ordering Nd0.5Sr0.5MnO3 probed by photoemission" Phys. Rev. B 59, 15528-15532 (1999).
  • A. Sekiyama, A. Fujimori, S. Aonuma, R. Kato: "Observation of anisotropy in the electronic states of N,N'-dicyanoquinonediimine-Cu salt by x-ray-absorption spectroscopy" Phys. Rev. B 56, 9937-9941 (1997).
  • A. Sekiyama, T. Susaki, A. Fujimori, T. Sasaki, N. Toyota, T. Kondo, G. Saito, M. Tsunekara, T. Iwasaki, T. Muro, T. Matsushita, S. Suga, H. Ishii and T. Miyahara: "High-resolution photoemission study of metallic, insulating and superconducting BEDT-TTF salts" Phys. Rev. B 56, 9082-9090 (1997).
  • A. Sekiyama, A. Fujimori, S. Aonuma, H. Sawa and R. Kato: "Fermi-liquid versus Luttinger-liquid behavior and metal-insulator transition in N,N'-dicyanoquinonediimine-Cu salt studied by photoemission" Phys. Rev. B 51, 13899-13902 (1995).


    • Invited talks

  • A. Sekiyama: "Bulk-sensitive soft/hard x-ray photoemission and linear dichroism studies of strongly correlated electron systems" [39th International Conference on Vacuum Ultraviolet and X-ray Physics (VUVX 2016) at Zürich, Switzerland (July, 2016)]. VUVX Conference Award
  • A. Sekiyama: "Linear Dichroism in Hard X-ray Core-Level Photoemission for Probing Strongly Correlated Bulk 4f-Orbital Symmetry in Ground and Excited States" [6th International Workshop on Hard X-ray Photoelectron Spectroscopy (HAXPES 2015) at Hsinchu, Taiwan (March-April, 2015)].
  • A. Sekiyama: "Present status of polarization-dependent hard x-ray photoemission spectroscopy of strongly correlated electron systems by using a highly focused beam in SPring-8" [NSRRC Annual Users' Meeting and 20th Anniversary of Operation at Hsinchu, Taiwan (September, 2013)].
  • A. Sekiyama: "Soft X-ray ARPES and Hard X-ray Photoemission Study of 4f-Based Heavy Fermion Systems with the 122-Structure" [The fourth International Workshop on the Dual Nature of f-Electrons at Himeji, Japan (July, 2012)].
  • A. Sekiyama: "Probing orbital symmetry in the valence bands of solids by polarization-dependent hard x-ray photoemission" [4th International Workshop on Hard X-ray Photoelectron Spectroscopy (HAXPES 2011) at Hamburg, Germany (September, 2011)].
  • A. Sekiyama: "Three-dimensional soft x-ray ARPES and polarization-dependent hard x-ray photoemission study of strongly correlated electron systems" [11th International Conference on Electronic Spectroscopy and Structure (ICESS-11) at Nara, Japan (October, 2009)].
  • A. Sekiyama: "Bulk-sensitive high-energy angle-resolved photoemission study of strongly correlated electron systems" [5th International Conference on Synchrotron Radiation in Materials Science (SRMS-5) at Chicago, IL, USA (August, 2006)].
  • A. Sekiyama: "High-resolution high-energy photoemission study of strongly correlated materials" [Gordon Research Conference on X-ray Physics, at New London, NH, USA (August, 2005)].
  • A. Sekiyama: "High-energy soft x-ray photoemission study of strongly correlated quasi-two-dimensional oxides" [NAREGI Workshop on Electronic Transport, Excitation and Correlation in Nano-Science, at Sapporo, Japan (October, 2004)].
  • A. Sekiyama: "High-energy and high-resolution photoemission studies of strongly correlated transition metal oxides and rare-earth compounds" [2003 APCTP (Asia Pacific Center for Theoretical Physics) Workshop on Magnetism Research using the Synchrotron Radiation and Neutrons, at Pohang, Korea (November, 2003)].
  • A. Sekiyama: "Bulk-sensitive high-energy photoemission study of strongly correlated systems" [Euroconference on Ab-initio many-body theory for correlated electron systems at Trieste, Italy (August, 2003)].
  • A. Sekiyama and S. Suga: "High-energy bulk-sensitive angle-resolved photoemission study of strongly correlated systems" [The 9th International Conference on Electronic Spectroscopy and Structure (ICESS-9) at Uppsala, Sweden (July, 2003)].
  • A. Sekiyama: "Bulk-sensitive angle-resolved photoemission study of superconducting cuprates and ruthenates" [The 5th SPring-8 International Workshop on 30-m Long Straight Section at SPring-8, Japan (May, 2002)].
  • A. Sekiyama and S. Suga: "Bulk-Sensitive High-Energy and High-Resolution Photoemission Spectroscopy of d and f Electron Systems" [Strongly Correlated Electron Systems 2001 (SCES2001), at Ann Arbor, MI, USA (August, 2001)].


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    Akira Sekiyama