2024 "Amplitude mode in a multi-gap superconductor MgB2 investigated by terahertz two-dimensional coherent spectroscopy" Kota Katsumi, Jiahao Liang, Ralph Romero III, Ke Chen, Xiaoxing Xi, and N. P. Armitage arXiv:2411.10852 "Revealing novel aspects of light-matter coupling in terahertz two-dimensional coherent spectroscopy: the case of the amplitude mode in superconductors" Kota Katsumi, Jacopo Fiore, Mattia Udina, Ralph Romero III, David Barbalas, John Jesudasan, Pratap Raychaudhuri, Goetz Seibold, Lara Benfatto, and N. P. Armitage Physical Review Letters 132, 256903 (2024) arXiv:2311.16449 Before 2024 "Near-infrared light-induced superconducting-like state in underdoped YBa2Cu3Oy studied by c-axis terahertz third-harmonic generation" Kota Katsumi, Morihiko Nishida, Stefan Kaiser, Shigeki Miyasaka, Setsuko Tajima, and Ryo Shimano Physical Review B 107, 214506 (2023) arXiv:2209.01633 “Light-induced coherent interlayer transport in stripe-ordered La1.6−xNd0.4SrxCuO4” Morihiko Nishida, Kota Katsumi, Dongjoon Song, Hiroshi Eisaki, and Ryo Shimano Physical Review B 107, 174523 (2023) arXiv:2303.01961 “Disentangling lattice and electronic instabilities in the excitonic insulator candidate Ta2NiSe5 by nonequilibrium spectroscopy" Kota Katsumi, Alexandr Alekhin, Sofia-Michaela Souliou, Michael Merz, Amir-Abbas Haghighirad, Matthieu Le Tacon, Sarah Houver, Maximilien Cazayous, Alain Sacuto, and Yann Gallais Physical Review Letters 130, 106904 (2023) arXiv:2211.08537 "Terahertz pulse-driven collective mode in the nematic superconducting state of Ba1-xKxFe2As2" Romain Grasset, Kota Katsumi, Pierre Massat, Hai-Hu Wen, Xian-Huin Chen, Yann Gallais, and Ryo Shimano npj Quantum Materials 7, 4 (2022) arXiv:2105.09159 “Light-induced enhancement of superconductivity in iron-based superconductor FeSe0.5Te0.5” Kazuki Isoyama, Naotaka Yoshikawa, Kota Katsumi, Jeremy Wong, Naoki Shikama, Yuki Sakishita, Fuyuki Nabeshima, Atsutaka Maeda, and Ryo Shimano Communications Physics 4, 160 (2021) "Nonreciprocal Terahertz Second Harmonic Generation in Superconducting NbN under Supercurrent Injection" Sachiko Nakamura, Kota Katsumi, Hirotaka Terai, and Ryo Shimano Physical Review Letters 125, 097004 (2020) arXiv:2003.00417 "Superconducting fluctuations probed by the Higgs mode in Bi2Sr2CaCu2O8+x thin films" Kota Katsumi, Zhi Zhong Li, Hélène Raffy, Yann Gallais, and Ryo Shimano Physical Review B 102, 054510 (2020) arXiv:1910.07695 "Phase-resolved Higgs response in superconducting cuprates" Hao Chu, Min-Jae Kim, Kota Katsumi, Sergey Kovalev, Robert David Dawson, Lukas Schwarz, Naotaka Yoshikawa, Gideok Kim, Daniel Putzky, Zhi Zhong Li, Hélène Raffy, Semyon Germanskiy, Jan-Christoph Deinert, Nilesh Awari, Igor Ilyakov, Bertram Green, Min Chen, Mohammed Bawatna, Georg Christiani, Gennady Logvenov, Yann Gallais, Alexander V. Boris, Bernhard Keimer, Andreas Schnyder, Dirk Manske, Michael Gensch, Zhe Wang, Ryo Shimano, and Stefan Kaiser Nature Communications 11, 1793 (2020) arXiv:1901.06675 "Higgs mode in the d-wave superconductor Bi2Sr2CaCu2O8+x driven by an intense terahertz pulse" Kota Katsumi, Naoto Tsuji, Yuki I. Hamada, Ryusuke Matsunaga, John Schneeloch, Ruidan D. Zhong, Genda D. Gu, Hideo Aoki, Yann Gallais, and Ryo Shimano Physical Review Letters 120, 117001 (2018) arXiv:1711.04923 *This paper is selected as the Editor's Suggestion.