PAPERS

2024 年

Terahertz photon to dc current conversion via magnetic excitations of multiferroics
M. Ogino, Y. Okamura, K. Fujiwara, T. Morimoto, N. Naogaosa, Y. Kaneko, Y. Tokura, and Y. Takahashi
Gapped nodal planes drive a large topological Nernst effect in a chiral lattice antiferromagnet
N. D. Khanh, S. Minami, M. Hirschmann, T. Nomoto, M. C. Jiang, R. Yamada, D. Yamaguchi, Y. Hayashi, Y. Okamura, H. Watanabe, G. Y. Guo, Y. Takahashi, S. Seki, Y. Taguchi, Y. Tokura, R. Arita, and M. Hirschberger
Large nonlinear optical magnetoelectric response in a noncentrosymmetric magnetic Weyl semimetal
K. Shoriki, K. Moriishi, Y. Okamura, K. Yokoi, H. Usui, H. Murakawa, H. Sakai, N. Hanasaki, Y. Tokura, and Y. Takahashi
Band transport evidence in PEDOT:PSS films using broadband optical spectroscopy from terahertz to ultraviolet region
Z. Guo, T. Sato, N. Takamura, R. Ikeda, T. Miyamoto, N. Kida, M. Ogino, Y. Takahashi, N. Kasuya, S. Watanabe, J. Takeya, Q. Wei, M. Mukaida, and H. Okamoto
Terahertz field driven giant nonlinear phonon response in ferroelectric semiconductor In-doped (Sn,Pb)Te
H. Handa, Y. Okamura, R. Yoshimi, A. Tsukazaki, K. S. Takahashi, Y. Tokura, and Y. Takahashi

2023 年

Observation of anomalous Hall resonance of massive Dirac fermions in topological kagome-lattice magnet
Y. Okamura, K. Shoriki, Y. Nomura, Y. Fujishiro, A. Kitaori, N. Kanazawa, R. Arita, Y. Tokura, and Y. Takahashi
Topological magneto-optical effect from skyrmion lattice
Y. D. Kato, Y. Okamura, M. Hirschberger, Y. Tokura, and Y. Takahashi
Optical magnetoelectric effects resonantly enhanced via electromagnons in cycloidal helimagnets Eu1-xYxMnO3
M. Ogino, Y. Kaneko, Y. Tokura, and Y. Takahashi

2022 年

Band structures in orientation-controlled CuI thin films under epitaxial strain
M. Nakamura, S. Inagaki, Y. Okamura, M. Ogino, Y. Takahashi, K. Adachi, D. Hashizume, Y. Tokura, and M. Kawasaki
Terahertz lattice and charge dynamics in ferroelectric semiconductor SnxPb1-xTe
Y. Okamura, H. Handa, R. Yoshimi, A. Tsukazaki, K. S. Takahashi, M. Kawasaki, Y. Tokura, and Y. Takahashi
Optical anomalous Hall effect enhanced by flat bands in ferromagnetic van der Waals semimetal
Y. D. Kato, Y. Okamura, S. Minami, R. Fujimura, M. Mogi, R. Yoshimi, A. Tsukazaki, K. Takahashi, M. Kawasaki, R. Arita, Y. Tokura, and Y. Takahashi
Photovoltaic effect by soft phonon excitation
Y. Okamura, T. Morimoto, N. Ogawa, Y. Kaneko, G-Y. Guo, M. Kawasaki, N. Naogaosa, Y. Tokura, and Y. Takahashi
Experimental signature of the parity anomaly in a semi-magnetic topological insulator
M. Mogi, Y. Okamura, M. Kawamura, R. Yoshimi, K. Yasuda, A. Tsukazaki, K. S. Takahashi, T. Morimoto, N. Nagaosa, M. Kawasaki, Y. Takahashi, and Y. Tokura
Role of Spin-Spiral Period for Anomalous Magnetic-Field-Induced Spectral Variation of Electromagnon Resonance in Multiferroic Ba2Mg2Fe12O22
H. Shishikura, S. Ishiwata, Y. Taguchi, Y. Tokura, Y. Takahashi

2021 年

Heteroepitaxial growth of wide bandgap cuprous iodide films exhibiting clear free-exciton emission
S. Inagaki, M. Nakamura, Y. Okamura, M. Ogino, Y. Takahashi, L. C. Peng, X. Z. Yu, Y. Tokura, and M. Kawasaki
Electric field control of natural optical activity in a multiferroic helimagnet
R. Masuda, Y. Kaneko, Y. Tokura and Y. Takahashi
Magneto-optical spectroscopy on Weyl nodes for anomalous and topological Hall effects in chiral MnGe
Y. Hayashi, Y. Okamura, N. Kanazawa, T. Yu, T. Koretsune, R. Arita, A. Tsukazaki, M. Ichikawa, M Kawasaki, Y. Tokura and Y. Takahashi
Enhanced gyrotropic birefringence and natural optical activity on electromagnon resonance in a helimagnet
S. Iguchi, R. Masuda, S. Seki, Y. Tokura and Y. Takahashi

2020 年

Gyrotropic birefringence via electromagnon resonance in a multiferroic of spin origin
M. Ogino, Y. Kaneko, Y. Tokura, and Y. Takahashi
Editors' Highlights
Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2
Y. Okamura, S. Minami, Y. Kato, Y. Fujishiro, Y. Kaneko, J. Ikeda, J. Muramoto, R. Kaneko, K. Ueda, V. Kocsis, N. Kanazawa, Y. Taguchi, T. Koretsune, K. Fujiwara, A. Tsukazaki, R. Arita, Y. Tokura & Y. Takahashi

2018 年

Electromagnon Resonance at Room Temperature with Gigantic Magnetochromism
H. Shishikura, Y. Tokunaga, Y. Takahashi, R. Masuda, Y. Taguchi, Y. Kaneko, and Y. Tokura

2017 年

Optical magnetoelectric resonance in a polar magnet (Fe,Zn)2Mo3O8 with axion-type coupling
T. Kurumaji, Y. Takahashi, J. Fujioka, R. Masuda, H. Shishikura, S. Ishiwata and Y. Tokura
Editors' Suggestion
Role of commensurability of spin order for optical magnetoelectric effect with electromagnons in multiferroic YMn2O5
R. Masuda, Y. Kaneko, Y. Yamasaki, Y. Tokura and Y. Takahashi
Electromagnon resonance in a collinear spin state of the polar antiferromagnet Fe2Mo3O8
T. Kurumaji, Y. Takahashi, J. Fujioka, R. Masuda, H. Shishikura, S. Ishiwata and Y. Tokura

2016 年

Observation of nonreciprocal directional dichroism via electromagnon resonance in a chiral-lattice helimagnet Ba3NbFe3Si2O14
H. Narita, Y. Tokunaga, A. Kikkawa, Y. Taguchi, Y. Tokura, and Y. Takahashi
Terahertz spectroscopy on Faraday and Kerr rotations in a quantum anomalous Hall state
K. N. Okada, Y. Takahashi, M. Mogi, R.Yoshimi, A.Tsukazaki, Kei S. Takahashi, N. Ogawa, M. Kawasaki, Y. Tokura
Versatile optical magnetoelectric effects by electromagnons in MnWO4 with canted spin-spiral plane
Y. Takahashi, S. Kibayashi, Y. Kaneko, and Y. Tokura
Electromagnon excitation in the field-induced noncollinear ferrimagnetic phase of Ba2Mg2Fe12O22 studied by polarized inelastic neutron scattering and terahertz time-domain optical spectroscopy
Taro Nakajima, Youtarou Takahashi, Shunsuke Kibayashi, Masaaki Matsuda, Kazuhisa Kakurai, Shintaro Ishiwata, Yasujiro Taguchi, Yoshinori Tokura, and Taka-hisa Arima

解説記事

らせん磁性体におけるエレクトロマグノンが誘起する巨大電気磁気光学効果
高橋陽太郎・十倉好紀

2015 年

Unidirectional terahertz light absorption in the pyroelectric ferrimagnet CaBaCo4O7
S. Bordács, V. Kocsis, Y. Tokunaga, U. Nagel, T. Rõõm, Y. Takahashi, Y. Taguchi, and Y. Tokura

2014 年

Magnetochiral dichroism resonant with electromagnons in a helimagnet
S. Kibayashi, Y. Takahashi, S. Seki and Y. Tokura
In-plane terahertz response of thin film Sr2RuO4
Y. Takahashi, S. Chakraverty, M. Kawasaki, H. Y. Hwang, and Y. Tokura
Anomalous domain-wall conductance in pyrochlore-type Nd2Ir2O7 on the verge of the metal-insulator transition
K. Ueda, J. Fujioka, Y. Takahashi, T. Suzuki, S. Ishiwata, Y. Taguchi, M. Kawasaki, and Y. Tokura

2013 年

Terahertz Magnetoelectric Resonance Enhanced by Mutual Coupling of Electromagnons
Y. Takahashi, Y. Yamasaki and Y. Tokura

2012 年

Variation of Charge Dynamics in the Course of Metal-Insulator Transition for Pyrochlore-Type Nd2Ir2O7
K. Ueda, J. Fujioka, Y. Takahashi, T. Suzuki, S. Ishiwata, Y. Taguchi, and Y. Tokura
Magnetoelectric resonance with electromagnon in a perovskite helimagnet
Y. Takahashi, R. Shimano, Y. Kaneko, H. Murakawa, Y. Tokura

2011 年以前の主な論文

"Magnetically driven ferroelectric atomic displacements in orthorhombic YMnO3"
D. Okuyama, S. Ishiwata, Y. Takahashi, K. Yamauchi, S. Picozzi, K. Sugimoto, H. Sakai, M. Takata, R. Shimano, Y. Taguchi, T. Arima, and Y. Tokura
Phys. Rev. B 84, 054440 (2011).

"Optical investigation of the collective dynamics of charge-orbital density waves in layered manganites"
J. Fujioka, Y. Ida, Y. Takahashi, N. Kida, R. Shimano, and Y. Tokura
Phys. Rev. B 82, 140409 (R) (2010).

"Electromagnons in the multiferroic state of perovskite manganites with symmetric exchange striction"
Youtarou Takahashi, Shintaro Ishiwata, Shin Miyahara, Yoshio Kaneko, Nobuo Furukawa, Yasujiro Taguchi, Ryo Shimano, and Yoshinori Tokura
Phys. Rev. B 81, 100413(R) (2010).

"Splitting dynamics of nuclear wave packets in a Peierls insulator using femtosecond laser spectroscopy"
Youtarou Takahashi, Keizo Yasukawa, Susumu Kurita, and Tohru Suemoto
Phys. Rev. B 81, 081102(R) (2010).

"Far-infrared optical study of electromagnons and their coupling to optical phonons in Eu1?xYxMnO3 ( x=0.1, 0.2, 0.3, 0.4, and 0.45)"
Y. Takahashi, Y. Yamasaki, N. Kida, Y. Kaneko, T. Arima, R. Shimano, and Y. Tokura
Phys. Rev. B 79, 214431 (2009). (selected as an editors suggestion)

"Systematics of electromagnons in the spiral spin-ordered states of R MnO3"
J. S. Lee, N. Kida, S. Miyahara, Y. Takahashi, Y. Yamasaki, R. Shimano, N. Furukawa, and Y. Tokura
Phys. Rev. B 79, 180403(R) (2009).

"Terahertz time-domain spectroscopy of electromagnons in multiferroic perovskite manganites"
N. Kida, Y. Takahashi, J. S. Lee, R. Shimano, Y. Yamasaki, Y. Kaneko, S. Miyahara, N. Furukawa, T. Arima, and Y. Tokura
J. Opt. Soc. Am. B 26, A35-A51 (2009).

"Propagation of a ballistic nuclear wavepacket on an adiabatic potential surface of a one-dimensional Br-bridged Pd complex without a self-trapped exciton state"
Youtarou Takahashi, Hiroshi Kitagawa, and Tohru Suemoto
Phys. Rev. B 79, 153103 (2009).

"Evidence for an electric-dipole active continuum band of spin excitations in multiferroic TbMnO3"
Y. Takahashi, N. Kida, Y. Yamasaki, J. Fujioka, T. Arima, R. Shimano, S. Miyahara, M. Mochizuki, N. Furukawa, and Y. Tokura
Phys. Rev. Lett. 101, 187201 (2008).

"Electrically driven spin excitation in the ferroelectric magnet DyMnO3"
N. Kida, Y. Ikebe, Y. Takahashi, J. P. He, Y. Kaneko, Y. Yamasaki, R. Shimano, T. Arima, N. Nagaosa, and Y. Tokura
Phys. Rev. B 78, 1044142 (2008).

"Wavepacket Motion in a Self-trapped Exciton of a Quasi-one-dimensional Halogen-bridged Pt Complex, [Pt(en)2][Pt(en)2I2] (ClO4)4, Observed by Femtosecond Time-resolved Luminescence Spectroscopy"
Keizo Yasukawa, Youtarou Takahashi and Tohru Suemoto
J. Phys. Soc. Jpn. 77 (2008) 064714.

"Wavepacket dynamics at low temperature in localized excitons of the quasi-one-dimensional Br-bridged Pt complex studied by femtosecond luminescence spectroscopy"
Yasukawa K, Takahashi Y, Suemoto T, Kurita S.
J. Phys. Soc. Jpn. 76, 084707 (2007).

"Nuclear wave-packet dynamics on nearly degenerate two adiabatic potensial energy surfaces in the excited state of KI F center"
Takeshi Koyama, Youtarou Takahashi, Makoto Nakajima, and Tohru Suemoto
Phys. Rev. B 76 115122 (2007).

"Relaxation processes from charge-transfer excited states of organic radical 1,3,5-trithia-2,4,6-triazapentalenyl crystals studied by ultrafast luminescence spectroscopy"
Youtarou Takahashi, Tohru Suemoto, Seiji Oguri, Jun Takeda
Phys. Rev. B 74, 193104 (2006).

"Lissajous-like wavepacket motion on the two-dimensional adiabatic potential surface in localized excitons"
K. Yasukawa, Y. Takahashi, S. Kurita and T. Suemoto
Solid State Communications 140 197-201 (2006).

"Persistent nuclear wave packet oscillation coexistent with incohernt vibrational population at excited F centers in Kl"
Takeshi Koyama, Youtarou Takahashi, Makoto Nakajima, and Tohru Suemoto
J. Chem. Phys. 124 221104 (2006).

"Selective observation of the wave-packet dynamics in the excited states at KBr F centers by luminescence experiments"
Takeshi Koyama, Youtarou Takahashi, Makoto Nakajima, and Tohru Suemoto
Phys. Rev. B 73 161102 1-4 (2006).

"Real-Time Observation on Femtosecond Depolarization of Room-Temparature Luminescence in KI F Centers"
Takeshi KOYAMA, Youtarou TAKAHASHI, Makoto NAKAJIMA and Tohru SUEMOTO
J. Phys. Soc. Jpn. 75 045001 1-2 (2006).

"Evidence for an excited state with a large lattice relaxation in quasi-one-dimensional halogen-bridged Ni complexes"
Y. Takahashi and T. Suemoto
Phys. Rev. B 70 081101(R) (2004).