Kohei Yoshimatsu Ph. D

Latest update Aug. 13rd, 2023 日本語版はこちら

Kohei YOSHIMATSU, Ph. D

Associate professor

School of Materials and Chemical Technology, Department of Chemical Science and Engineering, Tokyo Institute of Technology

South 1st building 1 room #204, S1-1, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8552, Japan

TEL: +81-03-5734-2127

E-MAIL: yoshimatsu.k.aa[at]m.titech.ac.jp (change [at] to @.)

2003-2007 Undergraduate student Department of Applied Chemistry, School of Engineering, The University of Tokyo
2007-2012 PhD student Department of Applied Chemistry, School of Engineering, The University of Tokyo

Ph. D. Thesis: 「Electronic Structures on Quantum Well States in Artificial Structures of Strongly Correlated Oxides studied by Synchrotron Radiation Photoemission Spectroscopy」

2009-2012 JSPS Research Fellow (DC1）

Prof. Oshima group Department of Applied Chemistry, The University of Tokyo

2012-2013 JSPS Postdoctral Fellow (PD）

Prof. Fujimori group Department of Physics, The University of Tokyo

2013-2015 Assistant Professor

Prof. Ohtomo group Department of Applied Chemistry, TokyoTech.

2016-2018 Assistant Professor

Prof. Ohtomo group Department of Chemical Science and Engineering, TokyoTech.

2018-2022 Lecturer

Prof. Kumigashira group Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

2023-2023 Associate professor

Prof. Kumigashira group Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

2023-present Associate professor

Department of Chemical Science and Engineering, Tokyo Institute of Technology

委員他

「応用物理」外部記者　2023/4/1~現在
Associate Editor of Frontiers in Materials 2022/12 ~現在
「応用物理」編集委員　2021/4/1~2023/3/31
Editorial Board Member of Scientific Reports 2016/9 ~現在

Original papers

2023

D. Shiga, X. Cheng, T. T. Kim, T. Kanda, N. Hasegawa, M. Kitamura, K. Yoshimatsu, and H. Kumigashira, "Electronic phase diagram of Cr-doped VO2 epitaxial films studied by in situ photoemission spectroscopy" Phys. Rev. B 108, 045112 (2023).
吉松　公平、”パルスレーザ堆積法によるλ相Ti3O5薄膜の合成 –薄膜による準安定相図の安定化” レーザ加工学会誌 Vol. 30, No. 1, pp. 42–45 (2023).
T. Kanda, D. Shiga, A. Wada, R. Hayasaka, Y. Masutake, N. Hasegawa, M. Kitamura, K. Yoshimatsu, and H. Kumigashira, "Quantization condition of strongly correlated electrons in oxide nanostructures" Commun. Mater. 4, 27 (2023).

2022

A. Ohtomo, T. Soma, and K. Yoshimatsu, "Electrochemical modulation of electronic states in strongly correlated transition-metal oxides " JSAP Review 220202 (2022).
K. Yoshimatsu, S. Miyazaki, N. Hasegawa, and H. Kumigashira, “Evidence of lattice deformation induced metal-insulator transition in Ti2O3” Phys. Rev. B (L) 106, L081110 (2022).
N. Hasegawa, K. Yoshimatsu, D. Shiga, T. Kanda, M. Kitamura, and K. Horiba, and H. Kumigashira, “Direct observation of band structure for Ti2O3 thin films by soft X-ray angle resolved photoemission spectroscopy” Phys. Rev. B 105, 235157 (2022).
吉松　公平、”新しい準安定酸化チタンλ相Ti3O5 〜多彩な相転移と薄膜合成〜” 光技術コンタクト Vol. 60 No. 5 pp12–20 (2022).
吉松　公平、”新しい準安定酸化チタン　多彩な機能と合成法” 化学と工業 (4月号) Vol. 75-4, pp264-265 (2022).
M. Kitamura, S. Souma, A. Honma, D. Wakabayashi, H. Tanaka, A. Toyoshima, K. Amemiya, T. Kawakami, K. Sugawara, K. Nakayama, K. Yoshimatsu, H. Kumigashira, T. Sato, and K. Horiba, "Development of a versatile micro-focused ARPES system with Kirkpatrick-Baez mirror optics" Rev. Sci. Instr. 93, 033906 (2022).
T. Soma, K. Yoshimatsu, K. Horiba, H. Kumigashira, and A. Ohtomo, “Two-dimensional superconductivity in single band correlated 2H-type NbO2 layers” Phys. Rev. B 105, 104504 (2022).
K. Yoshimatsu and H. Kumigashira, “Direct synthesis of metastable λ-phase Ti3O5 film on LaAlO3 (110) substrate under high temperatures” Cryst. Growth Des. 22, 703 (2022).

2021

T. Yajima, T. Soma, K. Yoshimatsu, and A. Ohtomo, “Heavy-fermion metallic state and Mott transition induced by Li-ion intercalation in LiV2O4 epitaxial films” Phys. Rev. B 104, 245104 (2021).
R. Yukawa, M. Kobayashi, T. Kanda, D. Shiga, K. Yoshimatsu, S. Ishibashi, M. Minohara, M. Kitamura, K. Horiba, A. Santander-Syro, and H. Kumigashira, "Resonant tunneling driven metal-insulator transition in double quantum-well structures of strongly correlated oxide" Nature Commun. 12, 7070 (2021).
T. Kanda, D. Shiga, R. Yukawa, N. Hasegawa, D. K. Nguyen, X. Cheng, R. Tokunaga, M. Kitamura, K. Horiba, K. Yoshimatsu, and H. Kumigashira, “Electronic structure of SrTi1-xVxO3 films studied by in situ photoemission spectroscopy: Screening for a transparent electrode material” Phys. Rev. B 104, 115121 (2021).
R. Wakabayashi, K. Yoshimatsu, M. Hattori, J. –S. Lee, O. Sakata, and A. Ohtomo, “Epitaxial stabilization of complete solid-solution β-(AlxGa1-x)2O3 (100) films by pulsed-laser deposition” Cryst. Growth Des. 21, 2844. (2021).
T. Soma, T. Kobayashi, K. Yoshimatsu, and A. Ohtomo、”Superconducting Dome Underlying Bipolaronic Insulating State in Charge-doped Ti4O7 Epitaxial Films” J. Phys. Soc. Jpn. 90, 023705 (2021).

2020

K. Yoshimatsu, N. Hasegawa, Y. Nambu, Y. Ishii, Y. Wakabayashi, and H. Kumigashira, “Metallic ground states in undoped Ti2O3 films induced by elongated c-axis lattice constant” Scientific Reports 10, 22109 (2020).
D. Shiga, B. E. Yang, N. Hasegawa, T. Kanda, R. Tokunaga, K. Yoshimatsu, R. Yukawa, M. Kitamura, K. Horiba, and H. Kumigashira, “Thickness dependence of electronic and crystal structures in VO2 ultrathin films: suppression of the collaborative Mott-Peierls transition” Phys. Rev. B 102, 115114 (2020).
T. Soma, K. Yoshimatsu, and A. Ohtomo, “P-type transparent superconductivity in two-dimensional Li1-xNbO2 with strongly correlated electrons at isolated d band” Science Advances 6, eabb8570 (2020).
J. Mizushiro, K. Yoshimatsu, N. Ohashi, M. Tanaka, O. Sakata, and A. Ohtomo, “Optical and structural investigations on titanium oxynitride films for visible-UV photocatalytic applications” J. Appl. Phys. 127, 135301 (2020).
G. Shibata, K. Yoshimatsu, E. Sakai, K. Ishigami, S. Sakamoto, Y. Nonaka, F. –H. Chang, H. -J. Lin, D. –J. Huang, C. –T. Chen, H. Kumigashira, and A. Fujimori, “Temperature evolution of magnetic phases near the thickness-dependent metal-insulator transition in La1−xSrxMnO3 thin films observed by XMCD” J. Phys. Conf. Proc. 30, 011072 (2020).

2019

K. Yoshimatsu, J. Ishimaru, K. Watarai, K. Yamamoto, Y. Hirata, H. Wadati, Y. Takeda, K. Horiba, H. Kumigashira, O. Sakata, and A. Ohtomo, “Magnetic and electronic properties of B-site-ordered double-perovskite oxide La2CrMnO6 thin films” Phys. Rev. B. 99, 235129 (2019).
S. Sekiguchi, T. Shiraishi, K. Miura, C. Kawashima, K. Yoshimatsu, A. Ohtomo, H. Kamioka, and H. Takahashi, “High-pressure study for superconductivity in Ti4O7 film” J. Phys. Soc. Jpn. 88, 035001 (2019).

2018

T. Soma, K. Yoshimatsu, K. Horiba, H. Kumigashira, and A. Ohtomo, "Electronic properties across metal-insulator transition in β-pyrochlore CsW2O6 epitaxial films" Phys. Rev. Mater. 2, 115003 (2018).
G. Shibata, K. Yoshimatsu, K. Ishigami, T. Harano, Y. Takahashi, S. Sakamoto, Y. Nonaka, T. Kadono, M. Furuse, S. Fuchino, M. Okano, J. Fujihira, A. Uchida, K. Watanabe, H. Fujihira, S. Fujihira, A. Tanaka, H. Kumigashira, T. Koide, and A. Fujimori, "Anisotropic charge distribution induced by spin polarization in La0.6Sr0.4MnO3 thin films by x-ray magnetic linear dichroism" J. Phys. Soc. Jpn. 87, 114713 (2018).
K. Yoshimatsu, H. Kurokawa, K. Horiba, H. Kumigashira, and A. Ohtomo, "Large anisotropy in conductivity of Ti2O3 films" APL Mater. 6, 101101 (2018).
R. Wakabayashi, M. Hattori, K. Yoshimatsu, K. Horiba, H. Kumigashira, and A. Ohtomo, “Band alignment at β-(AlxGa1-x)2O3/β-Ga2O3 (100) interface fabricated by pulsed-laser deposition” Appl. Phys. Lett. 112, 232103 (2018).
G. Shibata, M. Kitamura, M. Minohara, K. Yoshimatsu, T. Kadono, K. Ishigami, T. Harano, Y. Takahashi, S. Nakamoto, Y. Nonaka, K. Ikeda, Z. Chi, M. Furus, S. Luchino, M. Okano, J. Fujihira, A. Uchida, K. Watanabe, H. Fujihira, S. Fujihira, A. Tanaka, H. Kumigashira, T. Koide, and A. Fujimori, "Anisotropic spin-density distribution and magnetic anisotropy of strained La1-xSrxMnO3 thin films: Angle-dependent x-ray magnetic circular dichroism" npj Quantum Materials 3, 3 (2018).
R. Wakabayashi, K. Yoshimatsu, M. Hattori, and A. Ohtomo, “Epitaxial structure and electric property of β-Ga2O3 films grown on MgO (100) substrates by pulsed-laser deposition” Appl. Phys. Lett. 111, 162101 (2018).
M. Kobayashi, K. Yoshimatsu, T. Mitsuhashi, M. Kitamura, E. Sakai, R. Yukawa, M. Minohara, A. Fujimori, K. Horiba, and H. Kumigashira, “Breakdown of Fermi-liquid behavior in the two-dimensional limit of quantum-well states of strongly correlated oxides” Scientific Reports 7, 16621 (2018).

2017

R. Wakabayashi, K. Yoshimatsu, M. Hattori, and A. Ohtomo, "Epitaxial structure and electronic properties of β-Ga2O3 films grown on MgO (100) substrates by pulsed-laser deposition" Appl. Phys. Lett. 111, 162101 (2017).
M. Kobayashi, K. Yoshimatsu, T. Mitsuhashi, M. Kitamura, E. Sakai, R. Yukawa, M. Minohara, A. Fujimori, Koji Horiba, and Hiroshi Kumigashira, "Emergence of Quantum Critical Behavior in Metallic Quantum-Well States of Strongly Correlated Oxides" Sci. Rep. 7, 16621 (2017).
K. Yoshimatsu, O. Sakata, and A. Ohtomo, "Superconductivity in Ti4O7 and γ-Ti3O5 films" Sci. Rep. 7, 12544 (2017).
K. Yoshimatsu, H. Mashiko, N. Umezawa, K. Horiba, H. Kumigashira, and A. Ohtomo “Electronic Structures and Photoanodic Properties of Ilmenite-type MTiO3 Epitaxial Films (M = Mn, Fe, Co, Ni)” J. Phys. Chem. C 121, 18717 (2017).
N. Nishiyama, H. Mashiko, K. Yoshimatsu, K. Horiba, H. Kumigashira, and A. Ohtomo, "Highly oriented epitaxial CaFe2O4 thin films on TiO2 substrates grown by pulsed-laser deposition" Thin Solid Films 638, 406 (2017).
H. Kurokawa, K. Yoshimatsu, O. Sakata, and A. Ohtomo, "Effects of phase fraction on superconductivity of low-valence eutectic titanate films" J. Appl. Phys. 122, 055302 (2017).
M. M. Maitani, T. Yamada, H. Mashiko, K. Yoshimatsu, T. Oshima, A. Ohtomo, and Y. Wada, “Microwave effects on Co-Pi co-catalysis deposited on α-Fe2O3 for application to photocatalytic oxygen evolution” ACS Appl. Mater. Interf. 9, 10349 (2017).

2016

T. Oshima, R. Wakabayashi, M. Hattori, A. Hashiguchi, N. Kawano, K. Sasaki, T. Masui, A. Kuramata, S. Yamakoshi, K. Yoshimatsu, A. Ohtomo, T. Oishi, and M. Kasu, “Formation of indium tin oxide (ITO) ohmic contacts for β-Ga2O3” Jpn. J. Appl. Phys. 55, 1202B7 (2016).
K. Watarai, K. Yoshimatsu, K. Horiba, H. Kumigashira, O. Sakata, and A. Ohtomo, “Epitaxial synthesis and physical properties of double-perovskite oxide Sr2CoRuO6 thin films” J. Phys. Condens . Matter 28, 436005 (2016).
M. Hattori, T. Oshima, R. Wakabayashi, K. Yoshimatsu, K. Sasaki, T. Masui, A. Kuramata, S. Yamakoshi, K. Horiba, H. Kumigashira, and A. Ohtomo, "Epitaxial growth and electric properties of γ-Al2O3 (110) films on β-Ga2O3 (010) substrates" Jpn. J. Appl. Phys. 55, 1202B6 (2016).
K. Yoshimatsu, T. Soma, and A. Ohtomo, “Insulator to metal transition of WO3 epitaxial films induced by electrochemical Li-ion intercalation” Appl. Phys. Express 9, 075801 (2016).
T. Soma, K. Yoshimatsu, and A. Ohtomo, “Epitaxial growth of hexagonal tungsten bronze CsxWO3 films in superconducting phase region exceeding bulk limit” Appl. Phys. Express 9, 075801 (2016).
K. Nakamura, H. Mashiko, K. Yoshimatsu, and A. Ohtomo, "Impact of built-in potential across LaFeO3/SrTiO3 heterojunctions on photocatalytic activity"Appl. Phys. Lett. 108, 2116505 (2016).
K. Yoshimatsu, H. Okabe, T. Oshima, S. Ueda, and A. Ohtomo, “Strain-induced metal-insulator transition in t2g1 electron system of Sm0.5Ca0.5TiO3 thin films” Phys. Rev. B 93, 195159 (2016).
K. Horiba, M. Kitamura, K. Yoshimatsu, M. Minohara, E. Sakai, M. Kobayashi, A. Fujimori, and H. Kumigashira, “Isotropic Kink and Quasiparticle Excitations in the Three-Dimensional Perovskite Manganite La0.6Sr0.4MnO3” Phys. Rev. Lett. 116, 076401 (2016).
H. Mashiko, K. Yoshimatsu, T. Oshima, and A. Ohtomo, “Fabrication and Characterization of Semiconductor Photoelectrodes with Orientation-Controlled α-Fe2O3 Thin Films” J. Phys. Chem. C 120, 2724 (2016).
T. Yoshida, M. Kobayashi, K. Yoshimatsu, H. Kumigashira, and A. Fujimori, “Correlated electronic states of SrVO3 revealed by angle-resolved photoemission spectroscopy” J. Electron Spectrosc. Relat. Phenom. 208, 11 (2016).
R. Yukawa, K. Ozawa, S. Yamamoto, H. Iwasawa, K. Shimada, E. F. Schwier, K. Yoshimatsu, H. Kumigashira, H. Namatame, M. Taniguchi, and I. Matsuda, “Photon-dressed two-dimensional carriers on the ZnO surface” Phys. Rev. B 94, 165313 (2016).

2015

K. Yoshimatsu, M. Niwa, H. Mashiko, T. Oshima, and A. Ohtomo, “Reversible superconductor-insulator transition in LiTi2O4 induced by Li-ion electrochemical reaction” Scientific Reports 5, 16325 (2015).
M. Kobayashi, K. Yoshimatsu, E. Sakai, M. Kitamura, K. Horiba, A. Fujimori, and H. Kumigashira, “Origin of the Anomalous Mass Renormalization in Metallic Quantum Well States of Strongly Correlated Oxide SrVO3” Phys. Rev. Lett. 115, 076801 (2015).
K. Yoshimatsu, K. Nogami, K. Watarai, K. Horiba, H. Kumigashira, O. Sakata, T. Oshima, and A. Ohtomo, “Synthesis and magnetic properties of double-perovskite oxides La2MnFeO6 thin films” Phys. Rev. B 91, 054421 (2015).
K. Yoshimatsu, T. Suzuki, N. Tsuchimine, K. Horiba, H. Kumigashira, T. Oshima, and A. Ohtomo, “Direct Growth of Metallic TiH2 Thin Films by Pulsed-Laser Deposition” Appl. Phys. Express 8, 035801 (2015).
K. Ishigami, K. Yoshimatsu, D. Toyota, M. Takizawa, T. Yoshida, G. Shibata, T. Harano, Y. Takahashi, T. Kadono, V. K. Verma, V. R. Singh, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, T. Koide, M. Oshima, H. Kumigashira, and A. Fujimori “Thickness-dependent magnetic transition and strain-induced orbital magnetic moment in SrRuO3 thin film studied by X-ray magnetic circular dichroism” Phys. Rev. B 92, 064402 (2015).
H. Suzuki, K. Zhao, G. Shibata, Y. Takahashi, S. Sakamoto, K. Yoshimatsu, B. J. Chen, H. Kumigashira, F. -H. Chang, H. -J. Lin, D. J. Huang, C. T. Chen, B. Gu, S. Maekawa, Y. J. Uemura, C. Q. Jin and A. Fujimori, “Photoemission and X-ray Absorption Studies of the Diluted Magnetic Semiconductor Ba1-yKy(Zn1-xMnx)2As2 isostructural to Fe-based superconductors” Phys. Rev. B 91, 140401(R) (2015).
T. Oshima, K. Matsuyama, K. Yoshimatsu, and A. Ohtomo, “Conducting Si-doped g-Ga2O3 epitaxial films grown by pulsed-laser deposition” J. Cryst. Growth 421, 23 (2015).
R. Wakabayashi T. Oshima, M. Hattori, K. Sasaki, T. Masui, A. Kuramata, S. Yamakoshi, K. Yoshimatsu, and A. Ohtomo “Oxygen-radical-assistedpulsed-laserdepositionof β-Ga2O3 and β-(AlxGa1-x)2O3 films” J. Crst. Growth 424, 77 (2015).

2014

E. Sakai, K. Yoshimatsu, M. Tamamitsu, K. Horiba, A. Fujimori, M. Oshima, and H. Kumigashira, “Bandwidth-controlled metal-insulator transition in epitaxial PrNiO3 ultrathin films induced by dimensional crossover” Appl. Phys. Lett. 104, 171609 (2014).
G. Shibata, K. Yoshimatsu, E. Sakai, V. R. Singh, V. K. Verma, K. Ishigami, T. Harano, T. Kadono, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, A. Sawa, H. Kumigashira, M. Oshima, T. Koide, and A. Fujimori “Thickness-dependent ferromagnetic metal-to-paramagnetic insulator transition in La0.6Sr0.4MnO3 thin films studied by x-ray magnetic circular dichroism” Phys. Rev. B 89, 235123 (2014).
H. Wadati, J. Mravlje, K. Yoshimatsu, H. Kumigashira, M. Oshima, T. Sugiyama, E. Ikenaga, A. Fujimori, A. Georges, A. Radetinac, K. S. Takahashi, M. Kawasaki, and Y. Tokura ”Photoemission and DMFT study of electronic correlations in SrMoO3: Effects of Hund’s rule coupling and possible plasmonic sideband” Phys. Rev. B 90, 205131 (2014).
Y. Takahashi, V. K. Verma, G. Shibata, T. Harano, K. Ishigami, K. Yoshimatsu, T. Kadono, A. Fujimori, A. Tanaka, F. -H. Chang, H. -J. Lin, D. J. Huang, C. T. Chen, B. Pal, and D. D. Sarma, “Observation of magnetically hard grain boundaries in double-perovskite Sr2FeMoO6” Europhys. Lett. 108, 27003 (2014).
吉松　公平、”放射光光電子分光による強相関量子井戸状態の観測” 放射光 vol 27, No. 2 114 (2014).

2013

E. Sakai, M. Tamamitsu, K. Yoshimatsu, S. Okamoto, K. Horiba, M. Oshima, and H. Kumigashira, “Gradual localization of Ni 3d states in LaNiO3 ultrathin films induced by dimensional crossover.” Phys. Rev. B 87, 075132 (2013).
J. Fujihira, A. Uchida, S. Fujihira, M. Furuse, M. Okano, S. Fuchino, T. Kadono, K. Yoshimatsu, A. Fujimori, H. Kumigashira and T. Koide, “Development of Cryocooled YBCO Vector Magnet System with Three-axial Super-high Vacuum Bores” J. Cryo. Super. Soc. Jpn. 48, 233 (2013).
K. Yoshimatsu, H. Wadati, E. Sakai, T. Harada, Y. Takahashi, T. Harano, G. Shibata, K. Ishigami, T. Kadono, T. Koide, T. Sugiyama, E. Ikenaga, H. Kumigashira, M. Lippmaa, M. Oshima, and A. Fujimori, “Spectroscopic studies on the electronic and magnetic states of Co-doped perovskite manganite Pr0.8Ca0.2Mn1-yCoyO3 thin films” Phys. Rev. B 88, 174423 (2013).
K. Yoshimatsu, E. Sakai, M. Kobayashi, K. Horiba, T. Yoshida, A. Fujimori, M. Oshima, and H. Kumigashira, “Determination of the surface and interface phase shifts in metallic quantum well structures of perovskite oxides” Phys. Rev. B 88, 155308 (2013).
K. Nogami, K. Yoshimatsu, H. Mashiko, E. Sakai, H. Kumigashira, O. Sakata, T. Oshima, and A. Ohtomo, “Epitaxial synthesis and electronic properties of double-perovskite Sr2TiRuO6 films” Appl. Phys. Express 6, 105502 (2013).
T. Harano, G. Shibata, K. Yoshimatsu, K. Ishigami, V. K. Verma, Y. Takahashi, T. Kadono, T. Yoshida, A. Fujimori, T. Koide, F. –H. Chang, H. –J. Lin, D. –J. Huang, C. –T. Chen, P. –H. Xiang, H. Yamada, and A. Sawa, “Phase diagram of Ca1-xCexMnO3 thin films studied by X-ray magnetic circular dichroism” Solid State Commun. 174, 30 (2013).

2012

Y. Kozuka, H. Seki, T. C. Fujita, S. Charkraverty, K. Yoshimatsu, H. Kumigashira, M. Oshima, M. S. Bahramy, R. Arita, and M. Kawasaki, “Epitaxially Stabilized EuMoO3: A New Itinerant Ferromagnet” Chem. Mater. 24, 3746 (2012).
S. Aizaki, T. Yoshida, K. Yoshimatsu, M. Takizawa, M. Minohara, S. Ideta, A. Fujimori, K. Gupta, P. Mahadevan, K. Horiba, H. Kumigashira, and M. Oshima, “Self-Energy Effects on the Electronic Structure of SrVO3 Studied by Angle-Resolved Photoemission Spectroscopy” Phys. Rev. Lett. 109, 056401 (2012).
E. B. Guedes, M. Abbate, K. Ishigami, A. Fujimori, K. Yoshimatsu, H. Kumigashira, M. Oshima, F. C. Vicentin, P. T. Fonseca, and R. J. O. Mossanek, “Core level and valence band spectroscopy of SrRuO3: Electron correlation and covalence effects” Phys. Rev. B 86, 235127 (2012).

2011

K. Yoshimatsu, K. Horiba, H. Kumigashira, T. Yoshida, A. Fujimori, and M. Oshima, “Metallic Quantum Well States in Artificial Structures of Strongly Correlated Oxide” Science 333, 319 (2011).
S. Chakraverty, K. Yoshimatsu, Y. Kozuka, H. Kumigashira, M. Oshima, T. Makino, A. Ohtomo, and M. Kawasaki, “Magnetic and electronic properties of ordered double-perovskite La2VMnO6 thin films” Phys. Rev. B 84, 1324111 (2011).
E. Sakai, K. Yoshimatsu, K. Shibuya, H. Kumigashira, E. Ikenaga, M. Kawasaki, Y. Tokura and M. Oshima, "Competition between instabilities of Peierls transition and Mott transition in W-doped VO2 thin films" Phys. Rev. B 84, 195132 (2011).

2010

K. Yoshimatsu, T. Okabe, H. Kumigashira, S. Okamoto, S. Aizaki, A. Fujimori, and M. Oshima, “Dimensional-Crossover-Driven Metal-Insulator Transition in SrVO3 Ultrathin Films.” Phys. Rev. Lett. 104, 147601 (2010).

2009

K. Yoshimatsu, K. Horiba, H. Kumigashira, E. Ikenaga, and M. Oshima, “Thickness dependent electronic structure of La0.6Sr0.4MnO3 layer in SrTiO3/La0.6Sr0.4MnO3/SrTiO3 heterostructures studied by hard x–ray photoemission spectroscopy” Appl. Phys. Lett. 94, 071901 (2009).
K. Yoshimatsu, R. Yasuhara, H. Kumigashira and M. Oshima, "Yoshimatsu et al. Reply" Phys. Rev. Lett. 102, 199704 (2009).
K. Horiba, A. Maniwa, A. Chikamatsu, K. Yoshimatsu, H. Kumigashira, H. Wadati, A. Fujimori, S. Ueda, H. Yoshikawa, E. Ikenaga, J. J. Kim, K. Kobayashi, and M. Oshima “Pressure-induced change in the electronic structure of epitaxially strained La1-xSrxMnO3 thin films" Phys. Rev. B 80, 132406 (2009).
M. Matvejeff, K. Yoshimatsu, H. Kumigashira, M. Oshima, and M. Lippmaa “Chemical stability and transport properties of ultrathin La1.2Sr1.8Mn2O7 Ruddlesden-Popper films” Appl. Phys. Lett, 95, 152110 (2009).

2008

K. Yoshimatsu, R. Yasuhara, H. Kumigashira, and M. Oshima, "Origin of metallic states at the heterointerface between the band insulators LaAlO3 and SrTiO3" Phys. Rev. Lett. 101, 026802 (2008).

All publications are listed here.

Invited Talk

International conference

K. Yoshimatsu, "Epitaxial growth and physical properties of low-valence titanium okie films" 2017 Collaborative Conference on Materials Research (CCMR) Day1-5 (2017), Jeju, Korea 2017/6/26-6/30.
K. Yoshimatsu, "Modulation of superconductivity in oxide films using Li-ion electrochemical reactions" 2nd World Congress on Materials Science Day2-16 (2016), Abu Dhabi, UAE, 2016/11/28-11/30.
K. Yoshimatsu, K. Nogami, K. Watarai, H. Mashiko, E. Sakai, H. Kumigashira, O. Sakata, T. Oshima, and A. Ohtomo, “Synthesis and spectroscopic study on double-perovskite oxide thin films” Energy Materials Nanotechnology A24 (2014) Chengdu, China 2014/9/22-9/25.
K. Yoshimatsu, “Quantum confinement of strongly correlated electrons in oxide artificial structures” IMS Workshop on ASCM 13 3-3 (2013).
K. Yoshimatsu and H. Kumigashira, “Metallic quantum well states in artificial structures of strongly correlated oxide” The 6th AOFSRR 2012 A4.1. (2012).
K. Yoshimatsu, K. Horiba, H. Kimigashira, T. Yoshida, A. Fujimori, and M. Oshima, “Metal-insulator transition and two-dimensional electron liquid in SrVO3 ultrathin films” The 4th Indo-Japan Seminar 4, (2011).
K. Yoshimatsu, K. Horiba, H. Kumigashira, T. Yoshida, A. Fujimori, and M. Oshima, ”Metallic Quantum Well States in Artificial Structures of Strongly Correlated Oxide” FIRST-QS2C WS on ”Emergent Phenomena of Correlated Materials”, 6 (2011).

All contributed talks are listed here.

Prize

第14回超伝導分科会論文賞、「“p-type transparent superconductivity in a layered oxide,” Sci. Adv. 6 (2020) eabb8570.」 (2023).
Outstanding Reviewer of 2021 for Journal of Physics D: Applied Physics from IOP publishing (2022).
第6回応用物理学会薄膜・表面物理分科会論文賞「”Thickness dependence of electronic structures in VO2 ultrathin films: Suppression of the cooperative Mott-Peierls transition” Phys. Rev. B 102, 115114 (2020).」(2022).
Outstanding Reviewer of 2020 for Journal of Physics: Condensed Matter from IOP publishing (2021).
Top Cited Research in Semiconductors from Appl. Phys. Lett. (2020).
IOP trusted reviewer from IOP publishing (2020).
公益財団法人本多記念会、第60回原田研究奨励賞「低酸化数を持つ酸化チタン薄膜の電子物性開拓」(2020).
第30回トーキン科学技術賞「低価数を示す酸化チタン薄膜の創生と新規電子物性開拓」 (2020).
Top 100 Scientific Reports Physics Paper in 2017 "Superconductivity in Ti4O7 and γ-Ti3O5 films" (2018).
Poster Award “Superconductivity in higher titanium oxides” at 3rd Functional Oxide Thin Films for Advanced Energy and Information Technology Conference (2017).
第39回応用物理学会講演奨励賞「γ-Ti3O5薄膜の超伝導」13p-2H-20 (2015).
第18回日本放射光学会奨励賞「放射光光電子分光による強相関量子井戸状態の観測」(2014).
2013年度船井研究奨励賞「伝導性酸化物SrVO3による強相関量子化状態の創製と観測」(2014).
第25回日本放射光学会年会・放射光科学合同シンポジウム JSR12学生発表賞「強相関酸化物SrVO3における量子井戸状態」(5C002). (2012).