"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. Peter Armitage
"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)
"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)
"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)
"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)
"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)
"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)
"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)
"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) Editor's Suggestion!
2021. 7 Low Energy Electrodynamics of Solids LEES-2020 Best Poster Award! (Honorable mention)
2021. 3 The 12th research meeting in the Cryogenic Research Center Best Poster Award!
2019. 6 International Conference on Spectroscopies in Novel Superconductors Young Researchers Award!
2018. 3 Research Incentive Award (Master Course), Graduate School of Science, The University of Tokyo
2016. 6 6th International Conference on Photoinduced Phase Transitions Best Poster Award!
"Photoexcited nonequilibrium state of underdoped YBa2Cu3Oy studied by the terahertz nonlinear optical responses"
Kota Katsumi, Morihiko Nishida, Shigeki Miyasaka, Setsuko Tajima and Ryo Shimano
Low Energy Electrodynamics of Solids LEES-2020
Online, June 28th - July 1st and July 5th - July 8th, 2021
"Superconducting fluctuation probed by the terahertz pulse-driven Higgs mode in Bi2Sr2CaCu2O8+x thin films"
Kota Katsumi, Zhi Zhong Li, Hélène Raffy, Yann Gallais, and Ryo Shimano
2019 Workshop of Max Planck-UBC-UTokyo Center for Quantum Materials
The University of British Colombia, Vancouver, Canada, December 9th - 10th, 2019
“Study of superconducting fluctuation in cuprate superconductors through the observation of Higgs mode oscillation”
Kota Katsumi, Zhi Zhong Li, Hélène Raffy, Yann Gallais, and Ryo Shimano
Spectroscopies in Novel Superconductors SNS2019
Hongo, Japan, June 16th - 21st, 2019
“Observation of Higgs mode in the d-wave superconductor Bi2Sr2CaCu2O8+δ by THz pump-optical probe spectroscopy”
Kota Katsumi, Naoto Tsuji, Yuki I. Hamada, Ryusuke Matsunaga, John Schneeloch, Ruidan D. Zhong, Genda D. Gu, Hideo Aoki, Yann Gallais, and Ryo Shimano
Low Energy Electrodynamics of Solids LEES-2018
Portonovo, Italy, June 24th - 29th, 2018
"Terahertz pulse induced non-equilibrium dynamics of a d-wave cuprate superconductor"
Kota Katsumi, Ryusuke Matsunaga, J. Schneeloch, R. D. Zhong, G. D. Gu, Yann Gallais, and Ryo Shimano
International School and Workshop on Electronic Crystals ECRYS-2017
Corse, France, August 21st - September 2nd, 2017
"Exploring THz-induced dynamics of a d-wave superconducting condensate in the cuprate Bi2Sr2CaCu2O8+δ"
Kota Katsumi, Yuki I. Hamada, Ryusuke Matsunaga, J. Schneeloch, R. D. Zhong, G. D. Gu, Yann Gallais, and Ryo Shimano
6th International Conference on Photo-induced Phase Transitions
Sendai, Japan, June 4th - 9th, 2017
"Terahertz Even Harmonic Generation by pinned magnetic flux in an s-wave superconductor NbN with DC current injection"
Sachiko Nakamura, Kota Katsumi, Hirotaka Terai, Ryo Shimano
The Physical Society of Japan autumn meeting, 12pK36-9, University of Gifu, September, 2019
"Observation of superconducting fluctuation in Bi2Sr2CaCu2O8+x thin films by the terahertz pulse-induced Higgs mode"
Kota Katsumi, Zhi Zhong Li, Hélène Raffy, Yann Gallais, Ryo Shimano
74th The Physical Society of Japan meeting, 15aS-PS-35, University of Kyushu, March, 2019
"Terahertz Second Harmonic Generation in an s-wave superconductor NbN under DC current injection"
Sachiko Nakamura, Keisuke Tomita, Kota Katsumi, Hirotaka Terai, Ryo Shimano
74th The Physical Society of Japan meeting, 14pK207-10, University of Kyushu, March, 2019
"Superconducting fluctuation in Bi2Sr2CaCu2O8+x thin films revealed by the intense terahertz pulse-induced Higgs mode"
Kota Katsumi, Zhi Zhong Li, Hélène Raffy, Yann Gallais, Ryo Shimano
10th Cryogenic research center meeting, P-07, University of Tokyo, February, 2019
"Observation of superconducting fluctuation in Bi2Sr2CaCu2O8+x thin films by the intense terahertz pulse-driven Higgs mode"
Kota Katsumi, Zhi Zhong Li, Hélène Raffy, Yann Gallais, Ryo Shimano
2018 Workshop of Max Planck-UBC-UTokyo Center for Quantum Materials, P-4, University of Tokyo, December, 2018
"Higgs mode in a d-wave superconductor Bi2Sr2CaCu2O8+x excited by an intense terahertz pulse"
Kota Katsumi, Naoto Tsuji, Yuki I. Hamada, Ryusuke Matsunaga, J. Schneeloch, R. D. Zhong, G. D. Gu, Hideo Aoki, Yann Gallais, and Ryo Shimano
9th Cryogenic research center meeting, O-04, University of Tokyo, February, 2018
"Higgs spectroscopy in a d-wave superconductor "
Kota Katsumi，Romain Grasset，Yann Gallais，J. Higgins，R. Greene，Ryo Shimano
9th Cryogenic research center meeting, P-42, University of Tokyo, February, 2018
"Intense THz Pulse-Induced Higgs Mode in a d-wave cuprate superconductor Bi2Sr2CaCu2O8+x"
Kota Katsumi, Naoto Tsuji, Yuki I. Hamada, Ryusuke Matsunaga, J. Schneeloch, R. D. Zhong, G. D. Gu, Hideo Aoki, Yann Gallais, and Ryo Shimano
Planck-UBC-UT winter school, P-21, University of Tokyo, February, 2018
"Observation of Higgs mode in a d-wave superconductor Bi2Sr2CaCu2O8+x using an intense terahertz pulse"
Kota Katsumi, Naoto Tsuji, Yuki I. Hamada, Ryusuke Matsunaga, J. Schneeloch, R. D. Zhong, G. D. Gu, Hideo Aoki, Yann Gallais, and Ryo Shimano
10th Photon Frontier Network Symposium, E17, University of Kyoto, January, 2018
"Terahertz-induced non-equilibrium dynamics in a single-crystal Bi2Sr2CaCu2O8+x"
Kota Katsumi, Yuki I. Hamada, Ryusuke Matsunaga, J. Schneeloch, R. D. Zhong, G. D. Gu, Yann Gallais, and Ryo Shimano
72th The Physical Society of Japan meeting, 18aB14-12, University of Osaka, March, 2017
"Terahertz-induced non-equilibrium dynamics in a single-crystal high-temperature superconductor Bi2Sr2CaCu2O8+x"
Kota Katsumi, Yuki I. Hamada, Ryusuke Matsunaga, J. Schneeloch, R. D. Zhong, G. D. Gu, Yann Gallais, and Ryo Shimano
8th Cryogenic research center meeting, P-40, University of Tokyo, February, 2017
"Terahertz pulse induced non-equilibrium dynamics in a single-crystal high-temperature superconductor Bi2Sr2CaCu2O8+x"
Kota Katsumi, Yuki I. Hamada, Ryusuke Matsunaga, Yann Gallais, and Ryo Shimano
9th Photon Frontier Network Symposium, E21, Kosaikai museum, January, 2017