Publications

Ultrafast time-resolved observation of non-thermal current-induced switching in an antiferromagnetic Weyl semimetal

Kazuma Ogawa, Hanshen Tsai, Naotaka Yoshikawa, Takumi Matsuo, Yutaro Tsushima, Mihiro Asakura, Hanyi Peng, Takuya Matsuda, Tomoya Higo, Satoru Nakatsuji & Ryo Shimano

Nature Materials 25, 434 (2026)

On-Chip Terahertz Pump–Probe Spectroscopy Revealing Ultrafast Current-Induced Breakdown Dynamics in a Superconducting Nb Microstrip

Daichi Yoshioka, Fumiya Sekiguchi, Naotaka Yoshikawa, and Ryo Shimano

Nano Letters 25, 13764 (2025)

Light-induced anomalous Hall conductivity in the massive three-dimensional Dirac semimetal Co₃Sn₂S₂

Naotaka Yoshikawa^†, Shun Okumura^†, Yoshua Hirai, Kazuma Ogawa, Kohei Fujiwara, Junya Ikeda, Akihiro Ozawa, Takashi Koretsune, Ryotaro Arita, Aditi Mitra, Atsushi Tsukazaki, Takashi Oka, Ryo Shimano

Phys. Rev. B 111, 245104 (2025)

Intense terahertz pulse induced nonthermal melting of charge density wave order in a thin film of 3R-Ta_1+xSe₂

Ushio Narusaka^†, Naotaka Yoshikawa^†, Hideki Matsuoka, Yuki Tanaka, Maki Musashi, Masaki Nakano, Yoshihiro Iwasa, and Ryo Shimano

Phys. Rev. B 111, 045146 (2025)

Emergence of high-mobility carriers in topological kagome bad metal Mn₃Sn by intense photoexcitation

Takuya Matsuda, Tomoya Higo, Kenta Kuroda, Takashi Koretsune, Natsuki Kanda, Yoshua Hirai, Hanyi Peng, Takumi Matsuo, Cedric Bareille, Andrei Varykhalov, Naotaka Yoshikawa, Jun Yoshinobu, Takeshi Kondo, Ryo Shimano, Satoru Nakatsuji, and Ryusuke Matsunaga

Phys. Rev. Materials 9, 014202 (2025)

Giant antisymmetric magnetoresistance arising across optically controlled domain walls in the magnetic Weyl semimetal Co₃Sn₂S₂

Kohei Fujiwara, Kazuma Ogawa, Naotaka Yoshikawa, Koji Kobayashi, Kentaro Nomura, Ryo Shimano & Atsushi Tsukazaki

Commun. Mater. 5, 239 (2024)

Floquet Weyl states at one-photon resonance: An origin of nonperturbative optical responses in three-dimensional materials

Yoshua Hirai^†, Shun Okumura^†, Naotaka Yoshikawa, Takashi Oka, and Ryo Shimano

Phys. Rev. Research 6, L012027 (2024)

Ultrafast stroboscopic time-resolved magneto-optical imaging of domain wall motion in Pt/GdFeCo wires induced by a current pulse

Kazuma Ogawa, Naotaka Yoshikawa, Mio Ishibashi, Kay Yakushiji, Arata Tsukamoto, Masamitsu Hayashi, and Ryo Shimano

Phys. Rev. Research 5, 033151 (2023)

Ultrafast Dynamics of Intrinsic Anomalous Hall Effect in the Topological Antiferromagnet Mn₃Sn

Takuya Matsuda, Tomoya Higo, Takashi Koretsune, Natsuki Kanda, Yoshua Hirai, Hanyi Peng, Takumi Matsuo, Naotaka Yoshikawa, Ryo Shimano, Satoru Nakatsuji, and Ryusuke Matsunaga

Phys. Rev. Lett. 130, 126302 (2023)

Anomalous Hall effect of light-driven three-dimensional Dirac electrons in bismuth

Yoshua Hirai, Naotaka Yoshikawa, Masashi Kawaguchi, Masamitsu Hayashi, Shun Okumura, Takashi Oka, Ryo Shimano

arXiv:2301.06072

Non-volatile chirality switching by all-optical magnetization reversal in ferromagnetic Weyl semimetal Co₃Sn₂S₂

Naotaka Yoshikawa^†, Kazuma Ogawa^†, Yoshua Hirai, Kohei Fujiwara, Junya Ikeda, Atsushi Tsukazaki, & Ryo Shimano

Commun. Phys. 5, 328 (2022) · Press release →

Light-induced enhancement of superconductivity in iron-based superconductor FeSe_0.5Te_0.5

Kazuki Isoyama, Naotaka Yoshikawa, Kota Katsumi, Jeremy Wong, Naoki Shikama, Yuki Sakishita, Fuyuki Nabeshima, Atsutaka Maeda & Ryo Shimano

Commun. Phys. 4, 160 (2021)

Ultrafast switching to an insulating-like metastable state by amplitudon excitation of a charge density wave

Naotaka Yoshikawa, Hiroki Suganuma, Hideki Matsuoka, Yuki Tanaka, Pierre Hemme, Maximilien Cazayous, Yann Gallais, Masaki Nakano, Yoshihiro Iwasa & Ryo Shimano

Nature Physics 17, 909 (2021) · Press release →

Switchable generation of azimuthally- and radially-polarized terahertz beams from a spintronic terahertz emitter

Hiroaki Niwa, Naotaka Yoshikawa, Masashi Kawaguchi, Masamitsu Hayashi, and Ryo Shimano

Opt. Express 29, 13331 (2021)

Terahertz Emission from Bismuth Thin Films Induced by Excitation with Circularly Polarized Light

Yoshua Hirai, Naotaka Yoshikawa, Hana Hirose, Masashi Kawaguchi, Masamitsu Hayashi, and Ryo Shimano

Phys. Rev. Applied 14, 064015 (2020)

Dynamical symmetry of strongly light-driven electronic system in crystalline solids

K. Nagai, K. Uchida, N. Yoshikawa, T. Endo, Y. Miyata, K. Tanaka

Commun. Phys. 3, 137 (2020)

Phase-resolved Higgs response in superconducting cuprates

Hao Chu, Min-Jae Kim, Kota Katsumi, Sergey Kovalev, Robert David Dawson, Lukas Schwarz, Naotaka Yoshikawa, …, Stefan Kaiser

Nat. Commun. 11, 1793 (2020)

Inherent limit to coherent phonon generation under nonresonant light-field driving

K. Uchida, K. Nagai, N. Yoshikawa, K. Tanaka

Phys. Rev. B 101, 094301 (2019)

Light-induced nonequilibrium response of the superconducting cuprate La_2−xSr_xCuO₄

Hiroaki Niwa, Naotaka Yoshikawa, Kaito Tomari, Ryusuke Matsunaga, Dongjoon Song, Hiroshi Eisaki, Ryo Shimano

Phys. Rev. B 100, 104507 (2019)

Interband resonant high-harmonic generation by valley polarized electron-hole pairs

Naotaka Yoshikawa, Kohei Nagai, Kento Uchida, Yuhei Takaguchi, Shogo Sasaki, Yasumitsu Miyata, Koichiro Tanaka

Nat. Commun. 10, 3709 (2019)

Charge carrier dynamics of FeSe thin film investigated by terahertz magneto-optical spectroscopy

Naotaka Yoshikawa, Masayuki Takayama, Naoki Shikama, Tomoya Ishikawa, Fuyuki Nabeshima, Atsutaka Maeda, Ryo Shimano

Phys. Rev. B 100, 035110 (2019)

Coexistence of Kosmotropic and Chaotropic Impacts of Urea on Water As Revealed by Terahertz Spectroscopy

Keiichiro Shiraga, Yuichi Ogawa, Koichiro Tanaka, Takashi Arikawa, Naotaka Yoshikawa, Masahito Nakamura, Katsuhiro Ajito, and Takuro Tajima

J. Phys. Chem. B 122(3), 1268 (2018)

High-harmonic generation in graphene enhanced by elliptically polarized light excitation

Naotaka Yoshikawa, Tomohiro Tamaya, Koichiro Tanaka

Science 356, 736 (2017) · Press release →

Raman-like resonant secondary emission causes valley coherence in CVD-grown monolayer MoS₂

Naotaka Yoshikawa, Shuntaro Tani, and Koichiro Tanaka

Phys. Rev. B 95, 115419 (2017)

Biexciton state causes photoluminescence fluctuations in CdSe/ZnS core/shell quantum dots at high photoexcitation densities

N. Yoshikawa, H. Hirori, H. Watanabe, T. Aoki, T. Ihara, R. Kusuda, C. Wolpert, T. K. Fujiwara, A. Kusumi, Y. Kanemitsu, and K. Tanaka

Phys. Rev. B 88, 155440 (2013)