Properties of Oragnic Thin Films, Synchrotron Light, Laser
Education
2003/03, Graduated
2005/03, Master Course, Completed
2008/03, Doctor Course, Completed
Employment Experience
2008/04 - 2010/03 Researcher
2010/04 - * Assistant Professor, Synchrotron Light Application Center, Saga University
Field of Specialization
Condensed matter physics I, Quantum beam science, Thin film/Surface and interfacial physical properties
Membership in Academic Societies
Japan Society for Molecular Science, The Japan Society of Applied Physics, The Physical Society of Japan, The Japanese Society for Synchrotron Radiation Reseach, The Chemical Society of Japan
Themes for Ongoing Research
Magnetic properties and spin dynamics of organic thin films
Research Topics and Results
Variation in zinc phthalocyanine molecular orientation on
SrTiO3(100) surface 2022/12
Spatial Control of Charge Doping in n-Type Topological Insulators 2021/05
ZnPc/STO界面における分子配向と電子状態 2017/06
STO基板上における亜鉛フタロシアニン薄膜の分子配向と電子状態 2017/03
機能性材料のシンクロトロン光分析と佐賀大学ビームラインにおける電子状態研究 2016/12
Unoccupied electronic states of 3d transition-metal phthalocyanine thin films 2016/11
3d遷移金属フタロシアニン薄膜の非占有電子状態 2016/09
Linear Dichroism of Topological Surface State Studied by Angle-Resolved Multi-Photon Photoemission Spectroscopy 2015/11
Unoccupied Electronic Structures of Bi2Te3(111) Studied by Angle-Resolved Multi-Photon Photoemission Spectroscopy 2015/10
角度分解2光子光電子分光によるBi2Te3(111)表面の電子励起過程 2015/09
Image Potential States of Bi2Te3(111) Studied by Time-Resolved 2-Photon Photoemission Spectroscopy 2015/05
Image Potential States and Excited-electron Dynamics of Bi2Te3 Studied by Time-resolved 2-photon Photoemission Spectroscopy 2015/03
角度分解多光子光電子分光によるBi2Te3の非占有電子状態 2014/09
Occupied and Unoccupied Electronic States of Au(111) Studied by Combined Use of AR1PPE and AR2PPE 2014/08
Photo-excited Carrier Dynamics of Topological Insulator Bi_2_Te_3_ Studied by Time- and Angle-resolved Two-photon Photoemission Spectroscopy 2014/08
放射光およびレーザー光電子分光を用いた有機薄膜の電子状態研究 2014/06
2光子光電子分光によるBi2Te3の非占有電子状態と線二色性 2014/06
佐賀大学ビームラインにおける電子状態研究と今後の展望 2014/06
1光子および2光子光電子分光によるAu(111)の非占有電子構造研究 2014/03
1光子および 2光子光電子分光によるAu(111)の3次元バンド分散 2014/01
2光子光電子分光による Au(111) の非占有バンド構造研究 2013/11
Image Potential States on Manganese Phthalocyanine Thin Films 2012/09
時間分解光電子分光によるトポロジカル絶縁体Bi2Te3の励起電子ダイナミクス 2012/09
佐賀⼤学ビームラインにおける有機薄膜電⼦状態研究 2012/09
トポロジカル絶縁体Bi_2Te_3の励起電子ダイナミクス 2012/06
角度分解光電子分光によるMnPc/Cu(100)の電子状態研究 2012/03
2光子光電子分光による有機薄膜の占有・非占有電子状態研究 2012/01
MnPc/HOPG表面における鏡像準位と薄膜電子状態 2011/09
Occupied and Unoccupied Electronic States of Manganese Phthalocyanine Thin Films 2011/08
2光子光電子分光によるMnPc薄膜の非占有電子状態研究 2011/06
マンガンフタロシアニン薄膜の占有・非占有電子状態 2011/03
Spin reorientation transitions of Ni/Pd(111) films induced by Fe deposition 2010/06
Original Articles
Optical film-thinning of few-layer graphene epitaxially grown on 4H-SiC(0001) surface: robustness of monolayer-graphene against the photoexcitation; 2023/03 ANNOUNCEMENT INFO.; J. Phys.: Condens. Matter 35 (2023) 195401 AUTHOR; Ryosuke Horie, Ryuichi Hirosue, Jun’ichi Kanasaki, Kenji Kisoda, Isamu Yamamoto, Junpei Azuma and Kazutoshi Takahashi
Effects of adsorbed molecular ordering to the superconductivity of a two-dimensional atomic layer crystal; 2023/02 ANNOUNCEMENT INFO.; Physical Review Materials, 7, 024805 (2023). AUTHOR; Shunsuke Inagaki, Narunori Ebara, Takahiro Kobayashi, Ryota Itaya, Kenta Yokota, Isamu Yamamoto, Jacek Osiecki, Khadiza Ali, Craig Polley, H.M. Zhang, L. S. O. Johansson, Takashi Uchihashi, and Kazuyuki Sakamoto
Angle-resolved photoemission measurement along the van-der-Waals stacking direction of ZrTe3; 2022/08 ANNOUNCEMENT INFO.; Journal of the Physical Society of Japan, 91 (2022) 094708-1_4. AUTHOR; Makoto Maki, Yuji Fujimoto, Isamu Yamamoto, Junpei Azuma, Sora Kobayashi, Satoshi Demura, Hideaki Sakata
Thickness dependent band structure of α-bismuthine grown on epitaxial graphene; 2022/04 ANNOUNCEMENT INFO.; J. Phys. Cond. Matter, 34, 23, 235502 (2022) AUTHOR; Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, and Junpei Azuma
Photoinduced intragap excitations in the incommensurate charge density wave phase of Rb0.3MoO3; 2021/10 ANNOUNCEMENT INFO.; Physics Letters A, 412, 127576_1-5 (2021), 412, 127576 AUTHOR; Makoto Maki, Kazuki Matsuo, Emi Koga, Isamu Yamamoto, Junpei Azuma
Structural analyses of Gd3(Al,Ga)5O12 garnet solid solutions via X-ray and UV absorption spectroscopy experiments for Gd atoms; 2021/06 ANNOUNCEMENT INFO.; Journal of Alloys and Compounds 867 (2021) 159055, 867, 159055 AUTHOR; Mamoru Kitaura, Kei Kamada, Toshiaki Ina, Hisanori Yamane, Manabu Ishizaki, Shinta Watanabe, Junpei Azuma, Isamu Yamamoto, Akimasa Ohnishi, Takeshi Usuki
Spatial Control of Charge Doping in n-Type Topological Insulators; 2021/05 ANNOUNCEMENT INFO.; Nano Letters, 21, 4415-422 (2021), 21, 10, 4415-4422 AUTHOR; Sakamoto Kazuyuki, Ishikawa Hirotaka, Wake Takashi, Ishimoto Chie, Fujii Jun, Bentmann Hendrik, Ohtaka Minoru, Kuroda Kenta, Inoue Natsu, Hattori Takuma, Miyamachi Toshio, Komori Fumio, Yamamoto Isamu, Fan Cheng, Krüger Peter, Ota Hiroshi, Matsui Fumihiko, Reinert Friedrich, Avila José, Asensio Maria
One dimensionality of the spin-polarized surface conduction and valence bands on Bi/GaSb(110)-(2x1); 2020/06 ANNOUNCEMENT INFO.; Phys. Rev. B, 101, 23, 235306, 101, 23, 235306 AUTHOR; Yoshiyuki Ohtsubo, Naoki Tokumasu, Hiroshi Watanabe,Takuto Nakamura, Patrick Le Fevre, Francois Bertran, Masaki Imamura, Isamu Yamamoto, Junpei Azuma, Kazutoshi Takahashi, and Shin-ichi Kimura
Self-organized formation of chemical bonding in misfit-layered bismuth-based cobaltites; 2019/04 ANNOUNCEMENT INFO.; Journal of Electron Spectroscopy and Related Phenomena, 232, 95-99, 232, 95-99 AUTHOR; Makoto Maki, Sho-ichi Takakura, Isamu Yamamoto, Junpei Azuma
Circular dichroism in angle-resolved photoemission mapping of surface state on Bi(111); 2019/01 ANNOUNCEMENT INFO.; AIP Conf. Proc., 2054, 1, 040011 AUTHOR; Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, Junpei Azuma
Electronic structure of the surface unoccupied band of Ge(001)-c(4 × 2): Direct imaging of surface electron relaxation pathways; 2017/09 ANNOUNCEMENT INFO.; Physical Review B 96, 11, 115301_1-7 AUTHOR; J. Kanasaki, I. Yamamoto, J. Azuma, S. Fukatsu
Optical Absorption and Electric Resistivity of an L-Cysteine Film; 2016/11 ANNOUNCEMENT INFO.; Journal of the Physical Society of Japan, 85, 12, 124713 AUTHOR; Masao Kamada, Takuya Hideshima, Junpei Azuma, Isamu Yamamoto, Masaki Imamura, and Kazutoshi Takahashi
Occupied and unoccupied electronic structures of an L-cysteine film studied by core-absorption and resonant photoelectron spectroscopies; 2016/04 ANNOUNCEMENT INFO.; AIP Advances, 6, 4, 045306 (2016) AUTHOR; M. Kamada, T. Hideshima, J. Azuma, I. Yamamoto, M. Imamura, and K. Takahashi
Temperature-dependent Fermi surface of misfit cobaltite [Bi2Sr2O4]0.51CoO2:
A comparison with [Bi2Ba2O4]0.50CoO2; 2016/04 ANNOUNCEMENT INFO.; Physical Review B, 93, 16, 165118 (2016) AUTHOR; Sho-ichi Takakura, Isamu Yamamoto, Emi Koga, Fusao Ichikawa, Junpei Azuma, and Makoto Maki
Photo-induced valence change of the sulfur atom in an L-cysteine thin film grown on a
silver metal substrate in a saliva-emulated aqueous solution; 2015/04 ANNOUNCEMENT INFO.; Applied Physics Letters, 106, 17, 173702 AUTHOR; Toru Tsujibayashi, Junpei Azuma, Isamu Yamamoto, Kazutoshi Takahashi, and Masao Kamada
Photoelectron Spectroscopic Study on Decay Processes
of Core-Excited States of NaNO2; 2015/04 ANNOUNCEMENT INFO.; Journal of the Physical Society of Japan, 84, 5, 054707 AUTHOR; Masao Kamada, Junpei Azuma, Yuki Ueda, Isamu Yamamoto, Masaki Imamura, and Kazutoshi Takahashi
Anomalous photoelectric emission from Ag on zinc-phthalocyanine film; 2014/05 ANNOUNCEMENT INFO.; Applied Physics Letters 104, 193304 (2014), 104, 19, 193304 AUTHOR; Senku Tanaka, Tomohiro Otani, Ken Fukuzawa, Koji Ogawa, Junpei Azuma, Isamu Yamamoto, Kazutoshi Takahashi, Masao Kamada, and Ichiro Hiromitsu
Electronic structures in unoccupied states of Bi thin film studied with two-photon photoemission spectroscopy; 2013/02 ANNOUNCEMENT INFO.; Applied Surface Science, 267, 66-69 AUTHOR; Masaki Imamura, Shuji Fujimasa, Kazutoshi Takahashi, Isamu Yamamoto, Junpei Azuma, Masao Kamada
The observation of unoccupied quantum-well states in Bi thin film grown on Si(111) by two-photon photoemission spectroscopy; 2011/12 ANNOUNCEMENT INFO.; Applied Physics Letters, 99, 24, 243101_1-243101_3 AUTHOR; Shuji Fujimasa, Masaki Imamura, Kazutoshi Takahashi, Isamu Yamamoto, Junpei Azuma, and Masao Kamada
Lateral inhomogeneity of unoccupied states for PbPc films; 2011/03 ANNOUNCEMENT INFO.; Surface Science, 605, 9-10, 982-986 AUTHOR; R. Yamamoto, I. Yamamoto, M. Mikamori, T. Yamada, K. Miyakubo, T. Munakata
Spin reorientation transitions of Ni/Pd(111) films induced by Fe deposition; 2010/06 ANNOUNCEMENT INFO.; Physical Review B, 81, 21, 21442_1-21442_7 AUTHOR; Isamu Yamamoto, Takeshi Nakagawa, Yasumasa Takagi, Toshihiko Yokoyama
Magnetic Circular Dichroism Study of Ultrathin Ni Films by Threshold Photoemission and Angle Resolved Photoemission Spectroscopy; 2010/04 ANNOUNCEMENT INFO.; Journal of Electron Spectroscopy and Related Phenomena, 181, 2-3, 164-167 AUTHOR; Takeshi Nakagawa, Isamu Yamamoto, Yasumasa Takagi, Toshihiko Yokoyama
Unoccupied electronic states of 3d transition-metal phthalocyanine thin films; 2016/11 ANNOUNCEMENT INFO.; International Workshop on Advanced Spectroscopy of Organic Materials for Electronic Applications (ASOMEA-8), Okazaki, Japan, 2016.11.23-25 AUTHOR; I. Yamamoto, O. Inoue, M. Imamura, K. Takahashi, J. Azuma
Unoccupied Electronic structure of BiAg surface alloy studied with two-photon photoemission spectroscopy; 2016/10 ANNOUNCEMENT INFO.; The 13th Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures (ACSIN 2016), Rome, 2016.10.9-15 AUTHOR; Masaki Imamura, Koutaro Matsuishi, Kazutoshi Takahashi, Isamu Yamamoto, and Junpei Azuma
Electronic structure of ultrathin Bi(110) films on epitaxial graphene studied by SR and laser photoemission spectroscopy; 2016/10 ANNOUNCEMENT INFO.; The 13th Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures (ACSIN 2016), Rome, 2016.10.9-15 AUTHOR; Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, and Junpei Azuma
Angle-resolved photoemission study of ultrathin Bi(110) films grown on epitaxial graphene; 2016/07 ANNOUNCEMENT INFO.; The 39th International Conference of Vacuum Ultraviolet and X-ray Physics (VUVX2016), Zurich, 2016.7.3-8 AUTHOR; Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, and Junpei Azuma
Interface Oxidation and Carrier Lifetime of Graphene/SiC(0001) Studied by Synchrotron Radiation and Laser Photoemission Spectroscopy; 2015/11 ANNOUNCEMENT INFO.; The 15th International Conference on the Formation of Semiconductor Interfaces (ICFSI-15), Hiroshima, 2015.11.15-20 AUTHOR; Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, Junpei Azuma, and Masao Kamada
Linear Dichroism of Topological Surface State Studied by Angle-Resolved Multi-Photon Photoemission Spectroscopy; 2015/11 ANNOUNCEMENT INFO.; The 15th International Conference on the Formation of Semiconductor Interfaces (ICFSI-15), Nov.15-20, 2015, International Conference Center Hiroshima, Hiroshima, Japan AUTHOR; I. Yamamoto, Y. Nogata, J. Azuma, M. Imamura, K. Takahashi and M. Kamada
Unoccupied Electronic Structures of Bi2Te3(111) Studied by Angle-Resolved Multi-Photon Photoemission Spectroscopy; 2015/10 ANNOUNCEMENT INFO.; International Conference on Electron Spectroscopy and Structure (ICESS-15), Sep.28-Oct.2, 2015, Stony Brook University, USA AUTHOR; I. Yamamoto, Y. Nogata, J. Azuma, M. Imamura, K. Takahashi, M. Kamada
Two-Photon Photoemission Study of Hydrogen and Oxygen Intercalated Graphene on SiC(0001); 2015/05 ANNOUNCEMENT INFO.; The 9th International Symposium on Ultrafast Surface Dynamics (USD9), May 25-9, 2015, Lake Biwa, Japan AUTHOR; Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, Junpei Azuma and Masao Kamada
Image Potential States of Bi2Te3(111) Studied by Time-Resolved 2-Photon Photoemission Spectroscopy; 2015/05 ANNOUNCEMENT INFO.; The 9th International Symposium on Ultrafast Surface Dynamics (USD9), May 25-9, 2015, Lake Biwa, Japan AUTHOR; I. Yamamoto, Y. Nogata, J. Azuma, M. Imamura, K. Takahashi, M. Kamada
CDW gap in K0.3MoO3 studied by time-resolved photoemission spectroscopy; 2015/03 ANNOUNCEMENT INFO.; AUTHOR; E. Koga, J. Azuma, S. Takakura, I. Yamamoto, M. Maki, F. Ichikawa
Electronic states of misfit cobaltates [Bi2Ba2O4]qCoO2
and [Bi2Sr2O4]qCoO2 studied by ARPES; 2015/03 ANNOUNCEMENT INFO.; AUTHOR; S. Takakura, I. Yamamoto, J. Azuma, F. Ichikawa, M. Maki
Image Potential States and Excited-electron Dynamics of Bi2Te3 Studied by Time-resolved 2-photon Photoemission Spectroscopy; 2015/03 ANNOUNCEMENT INFO.; AUTHOR; I. Yamamoto, Y. Nogata, J. Azuma, M. Imamura, K. Takahashi, M. Kamada
Time-resolved Two-photon Photoemission Spectroscopy of Epitaxial Graphene on SiC; 2014/11 ANNOUNCEMENT INFO.; The 7th International Symposium on Surface Science, Nov.2-6, 2014, Shimane, Japan AUTHOR; Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, Junpei Azuma, and Masao Kamada
Photo-induced valence change of the L-cysteine/Ag grown in the aqueous solution; 2014/08 ANNOUNCEMENT INFO.; AUTHOR; T. Tsujibayashi, J. Azuma, I. Yamamoto, K. Takahashi, M. Kamada
Occupied and Unoccupied Electronic States of Au(111) Studied by Combined Use of AR1PPE and AR2PPE; 2014/08 ANNOUNCEMENT INFO.; The 15th IUMRS-International Conference in Asia (IUMRS-ICA 2014), Fukuoka, Japan, 2014.8.24-30(8/25) AUTHOR; Yutaro Nogata, Isamu Yamamoto, Junpei Azuma, Masaki Imamura, Kazutoshi Takahashi, and Masao Kamada
Photo-excited Carrier Dynamics of Topological Insulator Bi_2_Te_3_ Studied by Time- and Angle-resolved Two-photon Photoemission Spectroscopy; 2014/08 ANNOUNCEMENT INFO.; The 15th IUMRS-International Conference in Asia (IUMRS-ICA 2014), Fukuoka, Japan, 2014.8.24-30(8.25). AUTHOR; Isamu Yamamoto, Junpei Azuma, Koji Ogawa, Msaki Imamura, Kazutoshi Takahashi, and Msao Kamada
Image-potential States on Epitaxial Graphene Grown on SiC(0001) Studied by Time- and Angle-resolved Two-photon Photoemission Spectroscopy; 2014/08 ANNOUNCEMENT INFO.; The 15th IUMRS-International Conference in Asia (IUMRS-ICA 2014), Fukuoka, Japan, 2014.8.24-30(8.25). AUTHOR; Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, Junpei Azuma, and Masao Kamada
Quantized electronic states on Ag nanofilms grown on Si(111) studied by one-photon and two-photon photoemission spectroscopy; 2012/12 ANNOUNCEMENT INFO.; AUTHOR;
Electronic states of the amino-acid L-cysteine thin films; 2012/12 ANNOUNCEMENT INFO.; AUTHOR;
Ultraviolet excitation wavelength dependence of the luminescence property
of SrAl_2O_4:Eu,Dy; 2012/12 ANNOUNCEMENT INFO.; AUTHOR;
The electronic states in BiAg(111) surface alloys; 2012/12 ANNOUNCEMENT INFO.; AUTHOR;
Bi 表面における非占有電子状態に関する研究; 2012/12 ANNOUNCEMENT INFO.; AUTHOR;
Image Potential States on Manganese Phthalocyanine Thin Films; 2012/09 ANNOUNCEMENT INFO.; The 29th European Conference on Surface Science,(P2-049, 5/Sep.) Edinburgh, UK, (3-7/Sep. 2012). AUTHOR; I. Yamamoto, K. Mizoue, J. Azuma, M. Imamura, K. Takahashi and M. Kamada
Study of Quantum Well States in Bi Thin Film by Two-photon Photoemission Spectroscopy; 2012/09 ANNOUNCEMENT INFO.; The 12th International Conference on Electron Spectroscopy and Structure (ICESS-12), September 16-21, 2012, Saint-Malo, France AUTHOR; Masaki Imamura, Shuji Fujimasa, Kazutoshi Takahashi, Isamu Yamamoto, Junpei Azuma, Masao Kamada, and Hidehiro Yasuda
Excited Electronic States on Epitaxial Graphene Studied by Two-photon Photoemission Spectroscopy; 2012/09 ANNOUNCEMENT INFO.; The 12th International Conference on Electron Spectroscopy and Structure (ICESS-12), September 16-21, 2012, Saint-Malo, France AUTHOR; K. Takahashi, S. Anami, M. Imamura, I. Yamamoto, J. Azuma, and M. Kamada
Upgrade of Saga-university beamline in SAGA-LS; 2012/07 ANNOUNCEMENT INFO.; The 11th International Conference on Synchrotron Radiation Instrumentation (SRI2012) AUTHOR; K. Takahashi, M. Imamura, I. Yamamoto, J. Azuma, K. Ogawa, M. Kamada, S. Koda, H. Ohkuma, and S. Yamamoto
Occupied and Unoccupied Electronic States of Manganese Phthalocyanine Thin Films; 2011/08 ANNOUNCEMENT INFO.; AUTHOR; I. Yamamoto, J. Azuma, M. Imamura, K. Ogawa, K. Takahashi and M. Kamada