PUBLICATIONS


Original papers
  1. Ami M. Shirai, Yuta Murotani, Tomohiro Fujimoto, Natsuki Kanda, Jun Yoshinobu, and Ryusuke Matsunaga,
    "Valley polarization dynamics of photoinjected carriers at the band edge in room-temperature silicon studied by terahertz polarimetry",
    arXiv:2412.14564 [cond-mat.mtrl-sci]

  2. Tomohiro Fujimoto, Yuta Murotani, Tomohiro Tamaya, Takayuki Kurihara, Natsuki Kanda, Changsu Kim, Jun Yoshinobu, Hidefumi Akiyama, Takeo Kato, and Ryusuke Matsunaga,
    "Transverse Current Generation by Circularly Polarized Light in Terahertz-Biased Semiconductor",
    arXiv:2411.00528 [cond-mat.mtrl-sci]

  3. Takuya Matsuda, Tomoya Higo, Kenta Kuroda, Takashi Koretsune, Natsuki Kanda, Yoshua Hirai, Hanyi Peng, Takumi Matsuo, Cedric Bareille, Andrey Varykhalov, Naotaka Yoshikawa, Jun Yoshinobu, Takeshi Kondo, Ryo Shimano, Satoru Nakatsuji, and Ryusuke Matsunaga,
    "Emergence of high-mobility carriers in topological kagome bad metal Mn3Sn by intense photoexcitation",
    Physical Review Materials in press.
    arXiv:2311.12339 [cond-mat.str-el]

  4. Kotaro Ogawa, Natsuki Kanda, Yuta Murotani, and Ryusuke Matsunaga,
    "Programmable generation of counterrotating bicircular light pulses in the multi-terahertz frequency range",
    Nature Communications 15, 6310 (2024).
    arXiv:2312.04768 [physics.optics]

  5. Risako Kameyama*, Shunsuke Tanaka*, Yuta Murotani, Takuya Matsuda, Natsuki Kanda, Ryusuke Matsunaga, and Jun Yoshinobu,
    "Ultra-Broadband Detection of Coherent Infrared Pulses by Sum-Frequency Generation Spectroscopy in Reflection Geometry",
    Optics Letters 49, 3978 (2024).
    *equal contribution

  6. Yuta Murotani, Natsuki Kanda, Tomohiro Fujimoto, Takuya Matsuda, Manik Goyal, Jun Yoshinobu, Yohei Kobayashi, Takashi Oka, Susanne Stemmer, and Ryusuke Matsunaga,
    "Anomalous Hall Transport by Optically Injected Isospin Degree of Freedom in Dirac Semimetal Thin Film",
    Nano Letters 24, 222 (2024).
    arXiv:2310.01093 [cond-mat.mes-hall]

  7. Natsuki Kanda, Mayuri Nakagawa, Yuta Murotani, and Ryusuke Matsunaga,
    "Time-domain characterization of electric field vector in multi-terahertz pulses using polarization-modulated electro-optic sampling",
    Optics Express 32, 1576 (2024).
    arXiv:2309.11675 [physics.optics]

  8. Tomohiro Fujimoto, Takayuki Kurihara, Yuta Murotani, Tomohiro Tamaya, Natsuki Kanda, Changsu Kim, Jun Yoshinobu, Hidefumi Akiyama, Takeo Kato, and Ryusuke Matsunaga,
    "Observation of Terahertz Spin Hall Conductivity Spectrum in GaAs with Optical Spin Injection",
    Physical Review Letters 132, 016301 (2024). Editors' Suggestion
    arXiv:2305.09155 [cond-mat.mtrl-sci]

  9. Yuta Murotani, Natsuki Kanda, Tomohiro Fujimoto, Takuya Matsuda, Manik Goyal, Jun Yoshinobu, Yohei Kobayashi, Takashi Oka, Susanne Stemmer, and Ryusuke Matsunaga,
    "Disentangling the Competing Mechanisms of Light-Induced Anomalous Hall Conductivity in Three-Dimensional Dirac Semimetal",
    Physical Review Letters 131, 096901 (2023).
    arXiv:2211.02229 [cond-mat.mtrl-sci]

  10. Shunsuke Tanaka, Yuta Murotani, Shunsuke A. Sato, Tomohiro Fujimoto, Takuya Matsuda, Natsuki Kanda, Ryusuke Matsunaga, and Jun Yoshinobu,
    "Gapless detection of broadband terahertz pulses using a metal surface in air based on field-induced second-harmonic generation",
    Applied Physics Letters 122, 251101 (2023). Featured Article

  11. Mayuri Nakagawa, Natsuki Kanda, Toshio Otsu, Isao Ito, Yohei Kobayashi, and Ryusuke Matsunaga,
    "Jitter correction for asynchronous optical sampling terahertz spectroscopy using free-running pulsed lasers",
    Optics Express 31, 19371 (2023).
    arXiv:2303.01683 [physics.optics]

  12. Hiroaki Tanaka, Andrei V Telegin, Yurii P Sukhorukov, Vladimir A Golyashov, Oleg E Tereshchenko, Alexander N Lavrov, Takuya Matsuda, Ryusuke Matsunaga, Ryosuke Akashi, Mikk Lippmaa, Yosuke Arai, Shinichiro Ideta, Kiyohisa Tanaka, Takeshi Kondo, and Kenta Kuroda,
    "Semiconducting Electronic Structure of the Ferromagnetic Spinel HgCr2Se4 Revealed by Soft-X-Ray Angle-Resolved Photoemission Spectroscopy",
    Physical Review Letters 130, 186402 (2023).
    arXiv:2211.15884 [cond-mat.mtrl-sci]

  13. Takuya Matsuda, Tomoya Higo, Takashi Koretsune, Natsuki Kanda, Yoshua Hirai, Hanyi Peng, Takumi Matsuo, Naotaka Yoshikawa, Ryo Shimano, Satoru Nakatsuji, and Ryusuke Matsunaga,
    "Ultrafast Dynamics of Intrinsic Anomalous Hall Effect in the Topological Antiferromagnet Mn3Sn",
    Physical Review Letters 130, 126302 (2023).
    arXiv:2206.06627 [cond-mat.mtrl-sci]

  14. Yuta Murotani*, Natsuki Kanda*, Tatsuhiko N. Ikeda, Takuya Matsuda, Manik Goyal, Jun Yoshinobu, Yohei Kobayashi, Susanne Stemmer, and Ryusuke Matsunaga,
    "Stimulated Rayleigh Scattering Enhanced by a Longitudinal Plasma Mode in a Periodically Driven Dirac Semimetal Cd3As2",
    Physical Review Letters 129, 207402 (2022).
    arXiv:2112.13113 [cond-mat.mtrl-sci]
    *equal contribution

  15. Natsuki Kanda, Yuta Murotani, Takuya Matsuda, Manik Goyal, Salva Salmani-Rezaie, Jun Yoshinobu, Susanne Stemmer, and Ryusuke Matsunaga,
    "Tracking Ultrafast Change of Multiterahertz Broadband Response Functions in a Photoexcited Dirac Semimetal Cd3As2 Thin Film",
    Nano Letters 22, 2358 (2022).
    arXiv:2110.09689 [cond-mat.mtrl-sci]

  16. Natsuki Kanda, Nobuhisa Ishii, Jiro Itatani, and Ryusuke Matsunaga,
    "Optical parametric amplification of phase-stable terahertz-to-mid-infrared pulses studied in the time domain",
    Optics Express 29, 3479 (2021).
    arXiv:2005.03538 [physics.optics]

  17. Natsuki Kanda, Tomohiro Imahoko, Koji Yoshida, Akihiro Tanabashi, A. Amani Eilanlou, Yasuo Nabekawa, Tetsumi Sumiyoshi, Makoto Kuwata-Gonokami, and Katsumi Midorikawa,
    "Opening a new route to multiport coherent XUV sources via intracavity high-order harmonic generation",
    Light: Science & Applications 9, 168 (2020).

  18. Bing Cheng*, Natsuki Kanda*, Tatsuhiko N. Ikeda, Takuya Matsuda, Peiyu Xia, Timo Schumann, Susanne Stemmer, Jiro Itatani, N. P. Armitage, and Ryusuke Matsunaga,
    "Efficient Terahertz Harmonic Generation with Coherent Acceleration of Electrons in the Dirac Semimetal Cd3As2",
    Physical Review Letters 124, 117402 (2020).
    arXiv:1908.07164 [cond-mat.mtrl-sci].
    *equal contribution

  19. Takuya Matsuda, Natsuki Kanda, Tomoya Higo, N. P. Armitage, Satoru Nakatsuji, and Ryusuke Matsunaga,
    "Room-Temperature Terahertz Anomalous Hall Effect in Weyl Antiferromagnet Mn3Sn Thin Films",
    Nature Communications 11, 909 (2020).
    arXiv:1912.12668 [cond-mat.mtrl-sci].

  20. Hiroaki Niwa, Naotaka Yoshikawa, Kaito Tomari, Ryusuke Matsunaga, Dongjoon Song, Hiroshi Eisaki, and Ryo Shimano,
    "Light-induced nonequilibrium response of the superconducting cuprate La2-xSrxCuO4",
    Physical Review B 100, 104507 (2019). Editors' Suggestion.
    arXiv:1904.07449 [cond-mat.supr-con].

  21. Sachiko Nakamura, Yudai Iida, Yuta Murotani, Ryusuke Matsunaga, Hirotaka Terai, and Ryo Shimano,
    "Infrared Activation of Higgs Mode by Supercurrent Injection in Superconductor NbN",
    Physical Review Letters 122, 257001 (2019).
    arXiv:1809.10335 [cond-mat.supr-con].

  22. Kota Katsumi, Naoto Tsuji, Yuki I. Hamada, Ryusuke Matsunaga, John Schneeloch, Ruidan D. Zhong, Genda D. Gu, Hideo Aoki, Yann Gallais, and Ryo Shimano,
    "Higgs Mode in the d-Wave Superconductor Bi2Sr2CaCu2O8+x Driven by an Intense Terahertz Pulse",
    Physical Review Letters 120, 117001 (2018). Editors' Suggestion.
    arXiv:1711.0493 [cond-mat.supr-con].

  23. Go Yumoto, Ryusuke Matsunaga, Hiroki Hibino, and Ryo Shimano,
    "Ultrafast Terahertz Nonlinear Optics of Landau Level Transitions in a Monolayer Graphene",
    Physical Review Letters 120, 104701 (2018).

  24. Ryusuke Matsunaga, Naoto Tsuji, Kazumasa Makise, Hirotaka Terai, Hideo Aoki, and Ryo Shimano,
    "Polarization-resolved terahertz third-harmonic generation in a superconductor NbN: dominance of Higgs mode beyond the BCS approximation",
    Physical Review B 96, 020505(R) (2017).
    arXiv:1703.02815 [cond-mat.supr-con].

  25. Ryusuke Matsunaga, Naoto Tsuji, Hiroyuki Fujita, Arata Sugioka, Kazumasa Makise, Yoshinori Uzawa, Hirotaka Terai, Zhen Wang, Hideo Aoki, and Ryo Shimano,
    "Light-induced collective pseudospin precession resonating with Higgs mode in a superconductor",
    Science 345, 1145 (2014).
    Highlighted in Perspective: "Particle physics in a superconductor", Science 345, 1121 (2014).

  26. Ryusuke Matsunaga, Yuki I. Hamada, Kazumasa Makise, Yoshinori Uzawa, Hirotaka Terai, Zhen Wang, and Ryo Shimano,
    "Higgs Amplitude Mode in the BCS Superconductors Nb1-xTixN induced by Terahertz Pulse Excitation",
    Physical Review Letters 111, 057002 (2013).
    arXiv:1305.0381 [cond-mat.supr-con].

  27. Ryo Shimano, Go Yumoto, Je-Yoon Yoo, Ryusuke Matsunaga, Shinichi Tanabe, Hiroki Hibino, Takahiro Morimoto, and Hideo Aoki,
    "Quantum Faraday and Kerr rotations in graphene",
    Nature Communications 4, 1841 (2013).

  28. Ryusuke Matsunaga and Ryo Shimano,
    "Nonequilibrium BCS State Dynamics Induced by Intense Terahertz Pulses in a Superconducting NbN Film",
    Physical Review Letters 109, 187002 (2012).

  29. Makoto Okano, Ryusuke Matsunaga, Kazunari Matsuda, Satoshi Masubuchi, Tomoki Machida, and Yoshihiko Kanemitsu,
    "Raman study on the interlayer interactions and the band structure of bilayer graphene synthesized by alcohol chemical vapor deposition",
    Applied Physics Letters 99, 151916 (2011).
    Free pdf file on KURENAI

  30. Ryusuke Matsunaga, Kazunari Matsuda, and Yoshihiko Kanemitsu,
    "Observation of Charged Excitons in Hole-Doped Carbon Nanotubes Using Photoluminescence and Absorption Spectroscopy",
    Physical Review Letters 106, 037404 (2011) Editors' Suggestion.
    Selected for a Viewpoint in Physics 4, 5 (2011).
    Free pdf file on KURENAI

  31. Ryusuke Matsunaga, Kazunari Matsuda, and Yoshihiko Kanemitsu,
    "Origin of low-energy photoluminescence peaks in single carbon nanotubes: K-momentum dark excitons and triplet dark excitons",
    Physical Review B 81, 033401 (2010).
    Selected for the January 18, 2010 issue of Virtual Journal of Nanoscale Science & Technology, vol. 21, issue 3 (2010).
    Free pdf file on KURENAI

  32. Ryusuke Matsunaga, Yuhei Miyauchi, Kazunari Matsuda, and Yoshihiko Kanemitsu,
    "Symmetry-induced nonequilibrium distributions of bright and dark exciton states in single carbon nanotubes",
    Physical Review B 80, 115436 (2009).
    Selected for the October 12, 2009 issue of Virtual Journal of Nanoscale Science & Technology, vol. 20, issue 15 (2009).
    Free pdf file on KURENAI

  33. Kohei Yoshikawa, Ryusuke Matsunaga, Kazunari Matsuda, and Yoshihiko Kanemitsu,
    "Mechanism of exciton dephasing in a single carbon nanotube studied by photoluminescence spectroscopy",
    Applied Physics Letters 94, 093109 (2009).
    Selected for the March 16, 2009 issue of Virtual Journal of Nanoscale Science & Technology, vol. 19, issue 11 (2009).
    Free pdf file on KURENAI

  34. Ryusuke Matsunaga, Kazunari Matsuda, and Yoshihiko Kanemitsu,
    "Evidence for Dark Excitons in a Single Carbon Nanotube due to the Aharonov-Bohm Effect",
    Physical Review Letters 101, 147404 (2008).
    Selected for the October 20, 2008 issue of Virtual Journal of Nanoscale Science & Technology, vol. 18, issue 16 (2008).
    Free pdf file on KURENAI


Review articles
  1. Ryusuke Matsunaga and Kozo Okazaki,
    "Pump-probe spectroscopy for non-equilibrium condensed matter",
    Encyclopedia of Condensed Matter Physics (Second Edition) 1, 981 (2024).

  2. Hamid Chorsi, Bing Cheng, Bo Zhao, Johann Toudert, Viktar Asadchy, Omor F. Shoron, Shanhui Fan, and Ryusuke Matsunaga,
    "Topological materials for functional optoelectronic devices",
    Advanced Functional Materials 32, 2110655 (2022).

  3. Ryusuke Matsunaga and Ryo Shimano,
    "Nonlinear terahertz spectroscopy of Higgs mode in s-wave superconductors",
    Physica Scripta 92, 024003 (2017).

  4. Ryo Shimano, Shinichi Watanabe, and Ryusuke Matsunaga,
    "Intense terahertz pulse-induced nonlinear responses in carbon nanotubes",
    Journal of Infrared, Millimeter and Terahertz Waves 33, 861 (2012).


Proceedings
  1. Ryusuke Matsunaga and Ryo Shimano,
    "Higgs mode excitation in superconductors by intense terahertz pulse",
    Proceedings of SPIE 9835, Ultrafast Bandgap Photonics, 98351G (2016).

  2. Ryusuke Matsunaga and Ryo Shimano,
    "Higgs amplitude mode in s-wave superconductors revealed by terahertz pump-terahertz probe spectroscopy",
    Proceedings of SPIE 9361, Ultrafast Phenomena and Nanophotonics XIX, 93611D (2015).

  3. Ryusuke Matsunaga, Kazunari Matsuda, and Yoshihiko Kanemitsu,
    "Direct Observation of Dark Exciton States in Single Carbon Nanotubes",
    Journal of Luminescence 129, 1702 (2009).