Papers - MIYAMOTO Tatsuya
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Terahertz radiation by quantum interference of excitons in a one-dimensional Mott insulator Reviewed
Tatsuya Miyamoto, Akihiro Kondo, Takeshi Inaba, Takeshi Morimoto, Shijia You, Hiroshi Okamoto
Nature Communications 14 ( 1 ) 6229:1 - 6229:11 2023.10
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC
Abstract
Nearly monocyclic terahertz waves are used for investigating elementary excitations and for controlling electronic states in solids. They are usually generated via second-order optical nonlinearity by injecting a femtosecond laser pulse into a nonlinear optical crystal. In this framework, however, it is difficult to control phase and frequency of terahertz waves. Here, we show that in a one-dimensional Mott insulator of a nickel-bromine chain compound a terahertz wave is generated with high efficiency via strong electron modulations due to quantum interference between odd-parity and even-parity excitons produced by two-color femtosecond pulses. Using this method, one can control all of the phase, frequency, and amplitude of terahertz waves by adjusting the creation-time difference of two excitons with attosecond accuracy. This approach enables to evaluate the phase-relaxation time of excitons under strong electron correlations in Mott insulators. Moreover, phase- and frequency-controlled terahertz pulses are beneficial for coherent electronic-state controls with nearly monocyclic terahertz waves.DOI： 10.1038/s41467-023-41463-8
Other Link： https://www.nature.com/articles/s41467-023-41463-8
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Piezoelectric Transition in a Nonpyroelectric Gyroidal Metal–Organic Framework
Shunsuke Kitou, Hajime Ishikawa, Yusuke Tokunaga, Masato Ueno, Hiroshi Sawa, Yuiga Nakamura, Yuto Kinoshita, Tatsuya Miyamoto, Hiroshi Okamoto, Koichi Kindo, Taka-hisa Arima
Journal of the American Chemical Society 2025.03
Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)
DOI： 10.1021/jacs.5c00886
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Observation of nonreciprocal polarization modulations induced by an intense terahertz electric-field pulse in an electronic-type molecular ferroelectric
T. Kubo, T. Miyamoto, N. Takamura, M. Yamamoto, R. Ikeda, T. Sato, H. Okamoto
Physical Review Research 2025.02
Publishing type：Research paper (scientific journal)
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Higher conductivity in doped ethylenedioxythiophene (EDOT) dimers with chalcogen-substituted end groups Reviewed
Kota Onozuka, Tomoko Fujino, Tatsuya Miyamoto, Takashi Yamakawa, Hiroshi Okamoto, Hiroshi Akiba, Osamu Yamamuro, Eiichi Kayahara, Shigeru Yamago, Hiroshi Oike, Hatsumi Mori
Journal of Materials Chemistry C 12 ( 35 ) 13956 - 13965 2024.08
Language：English Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)
Chalcogen substitution at the end groups of doped EDOT oligomers impacts on the crystal and electronic structures, enhancing their conducting properties.
DOI： 10.1039/d4tc02346c
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Two-step growth of high-quality single crystals of the Kitaev magnet α−RuCl3 Reviewed International coauthorship
R. Namba, K. Imamura, R. Ishioka, K. Ishihara, T. Miyamoto, H. Okamoto, Y. Shimizu, Y. Saito, Y. Agarmani, M. Lang, H. Murayama, Y. Xing, S. Suetsugu, Y. Kasahara, Y. Matsuda, K. Hashimoto, T. Shibauchi
Physical Review Materials 8 ( 7 ) 074404:1 - 074404:8 2024.07
Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society (APS)
DOI： 10.1103/physrevmaterials.8.074404
Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevMaterials.8.074404/fulltext
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Orbital hybridization of donor and acceptor to enhance the conductivity of mixed-stack complexes Reviewed
Tomoko Fujino, Ryohei Kameyama, Kota Onozuka, Kazuki Matsuo, Shun Dekura, Tatsuya Miyamoto, Zijing Guo, Hiroshi Okamoto, Toshikazu Nakamura, Kazuyoshi Yoshimi, Shunsuke Kitou, Taka-hisa Arima, Hiroyasu Sato, Kaoru Yamamoto, Akira Takahashi, Hiroshi Sawa, Yuiga Nakamura, Hatsumi Mori
Nature Communications 15 ( 1 ) 2024.04
Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC
Abstract
Mixed-stack complexes which comprise columns of alternating donors and acceptors are organic conductors with typically poor electrical conductivity because they are either in a neutral or highly ionic state. This indicates that conductive carriers are insufficient or are mainly localized. In this study, mixed-stack complexes that uniquely exist at the neutral–ionic boundary were synthesized by combining donors (bis(3,4-ethylenedichalcogenothiophene)) and acceptors (fluorinated tetracyanoquinodimethanes) with similar energy levels and orbital symmetry between the highest occupied molecular orbital of the donor and the lowest unoccupied molecular orbital of the acceptor. Surprisingly, the orbitals were highly hybridized in the single-crystal complexes, enhancing the room-temperature conductivity (10<sup>−4</sup>–0.1 S cm<sup>−1</sup>) of mixed-stack complexes. Specifically, the maximum conductivity was the highest reported for single-crystal mixed-stack complexes under ambient pressures. The unique electronic structures at the neutral–ionic boundary exhibited structural perturbations between their electron-itinerant and localized states, causing abrupt temperature-dependent changes in their electrical, optical, dielectric, and magnetic properties.DOI： 10.1038/s41467-024-47298-1
Other Link： https://www.nature.com/articles/s41467-024-47298-1
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Band transport evidence in PEDOT:PSS films using broadband optical spectroscopy from terahertz to ultraviolet region Reviewed
Zijing Guo, Tetsu Sato, Yang Han, Naoki Takamura, Ryohei Ikeda, Tatsuya Miyamoto, Noriaki Kida, Makiko Ogino, Youtarou Takahashi, Naotaka Kasuya, Shun Watanabe, Jun Takeya, Qingshuo Wei, Masakazu Mukaida, Hiroshi Okamoto
Communications Materials 5 26:1 - 26:13 2024.03
Language：English Publishing type：Research paper (scientific journal)
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Destabilization of spin-Peierls phase via a charge-spin modulated Floquet state induced by intramolecular vibrational excitation Reviewed
Daiki Sakai, Takashi Yamakawa, Hajime Ueda, Ryohei Ikeda, Tatsuya Miyamoto, Hiroshi Okamoto
Communications Physics 7 40:1 - 40:10 2024.01
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Melting of excitonic insulator phase by an intense terahertz pulse in Ta2NiSe5
N. Takamura, T. Miyamoto, R. Ikeda, T. Kubo, M. Yamamoto, H. Sato, Y. Han, T. Ito, T. Sato, A. Nakano, H. Sawa, and H. Okamoto
Physical Review Research 2024
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Detecting Magnetoelectric Effect in a Metallic Antiferromagnet via Nonreciprocal Rotation of Reflected Light Reviewed
Keito Arakawa, Takeshi Hayashida, Kenta Kimura, Ryusuke Misawa, Takayuki Nagai, Tatsuya Miyamoto, Hiroshi Okamoto, Fumitoshi Iga, Tsuyoshi Kimura
Physical Review Letters 131 236702:1 - 236702:6 2023.12
Language：English Publishing type：Research paper (scientific journal)
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Melting of excitonic insulator phase by an intense terahertz pulse in Ta$_2$NiSe$_5$
Naoki Takamura, Tatsuya Miyamoto, Ryohei Ikeda, Tetsushi Kubo, Masaki Yamamoto, Hiroki Sato, Yang Han, Takayuki Ito, Tetsu Sato, Akitoshi Nakano, Hiroshi Sawa, and Hiroshi Okamoto
arXiv 2309.05286:1 - 2309.05286:66 2023.09
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Dynamical aspects of excitonic Floquet states generated by a phase-locked mid-infrared pulse in a one-dimensional Mott insulator Reviewed
Takashi Yamakawa, Tatsuya Miyamoto, Daiki Sakai, Hiroshi Okamoto
New Journal of Physics 25 093044:1 - 093044:20 2023.09
Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Metallic State of a Mixed-Sequence Oligomer Salt That Models Doped PEDOT Family Reviewed
Kota Onozuka, Tomoko Fujino, Ryohei Kameyama, Shun Dekura, Kazuyoshi Yoshimi, Toshikazu Nakamura, Tatsuya Miyamoto, Takashi Yamakawa, Hiroshi Okamoto, Hiroyasu Sato, Taisuke Ozaki, Hatsumi Mori
Journal of the American Chemical Society 145 ( 28 ) 15152 - 15161 2023.07
Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)
DOI： 10.1021/jacs.3c01522
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Experimental verification of charge soliton excitations in the ionic Mott-Peierls ferroelectric TTF-CA Reviewed
R. Takehara, H. Adachi, K. Sunami, K. Miyagawa, T. Miyamoto, H. Okamoto, S. Horiuchi, K. Kanoda
Physical Review B 107 125164:1 - 125164:6 2023.03
Language：English Publishing type：Research paper (scientific journal)
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Efficient Mott insulator-metal transition by an intense terahertz electric field pulse via quantum tunneling Reviewed
N. Takamura, T. Miyamoto, S. Liang, K. Asada, T. Terashige, Y. Takahashi, T. Hasegawa, H. Okamoto
Physical Review B 107 085147:1 - 085147:14 2023.02
Authorship：Corresponding author Publishing type：Research paper (scientific journal)
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Detecting magnetoelectric effect in a metallic antiferromagnet via nonreciprocal rotation of reflected light Reviewed
Keito Arakawa, Takeshi Hayashida, Kenta Kimura, Ryusuke Misawa, Takayuki Nagai, Tatsuya Miyamoto, Hiroshi Okamoto, Fumitoshi Iga, and Tsuyoshi Kimura
Physical Review Letters 2023
Language：English Publishing type：Research paper (scientific journal)
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Emission of Terahertz Electromagnetic Waves: A New Spectroscopic Method to Investigate Physical Properties of Solids Invited Reviewed
Noriaki Kida, Tatsuya Miyamoto, Hiroshi Okamoto
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 91 ( 11 ) 2022.11
Language：English Publisher：PHYSICAL SOC JAPAN
When a femtosecond laser pulse is applied to a solid with no spatial inversion symmetry, a low-frequency oscillation of polarization sometimes appears via the second-order nonlinear optical effect or equivalently the optical rectification. This results in an emission of terahertz electromagnetic waves via the electric-dipole radiation mechanism, which is usually called a terahertz radiation. In this review, we show that such a terahertz-radiation process itself can be used to reveal physical properties of solids. One example is the detections of ferroelectric domains and domain walls, which are demonstrated in various organic and inorganic ferroelectrics. The amplitude and sign of electric fields of the terahertz radiation are found to reflect the magnitude and direction of the original ferroelectric polarization, respectively. By using these characteristics, ferroelectric domains and domain walls can be visualized by measuring the position dependence of the electric-field waveform of the terahertz radiation over the sample. This method is also applied to determine the polarization vector in three dimensions in ferroelectric films. A similar terahertz radiation can be used as a probe to detect the conducting path in a negative differential resistance state, which is induced by the application of an external electric field on a ferroelectric charge-order material. Besides the electric-dipole radiation, the magnetic-dipole radiation is possible to occur in magnets. Using an emission of the terahertz electromagnetic waves originating from the magnetization modulation, visualization of magnetic domains can be achieved in ferrimagnets. In addition, we review new types of terahertz-radiation mechanisms based upon an impulsive stimulated Raman scattering process, a circular photogalvanic effect, and a photoinduced phase transition. We show that valuable information about the steady-state and dynamical electronic properties of solids can be derived by analyzing the amplitude, phase, and polarization of electromagnetic waves observed in various types of terahertz radiations.
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Hydrogen Bonding Propagated Phase Separation in Quasi-Epitaxial Single Crystals: A Pd–Br Molecular Insulator Reviewed
Takefumi Yoshida, Shinya Takaishi, Laurent Guérin, Tatsuhiro Kojima, Hiroyoshi Ohtsu, Masaki Kawano, Tatsuya Miyamoto, Hiroshi Okamoto, Kenichi Kato, Masaki Takata, Yuka Hosomi, Shoji Yoshida, Hidemi Shigekawa, Hisaaki Tanaka, Shin-ichi Kuroda, Hiroaki Iguchi, Brian K. Breedlove, Zhao-Yang Li, Masahiro Yamashita
Inorganic Chemistry 61 ( 35 ) 14067 - 14074 2022.09
Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)
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Terahertz Radiation with Multi-Narrowband Components via Photoinduced Melting of Charge Order in an Electronic-Type Ferroelectric Organic <i>α</i>-(BEDT-TTF)<sub>2</sub>I<sub>3</sub> Reviewed
Yuto Kinoshita, Hiromichi Yamakawa, Tatsuya Miyamoto, Kaoru Yamamoto, Hatumi Mori, Hiroshi Okamoto, Noriaki Kida
Journal of the Physical Society of Japan 91 ( 9 ) 2022.08
Publishing type：Research paper (scientific journal) Publisher：Physical Society of Japan
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Ni(III) Mott–Hubbard-like State Containing High-Spin Ni(II) in a Semiconductive Bromide-Bridged Ni-Chain Compound Reviewed
Masanori Wakizaka, Mohammad Rasel Mian, Takefumi Yoshida, Tetsu Sato, Hisaaki Tanaka, Tatsuya Miyamoto, Hiroshi Okamoto, Shinya Takaishi, Hiroaki Iguchi, Masahiro Yamashita
Inorganic Chemistry 2022.06
Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)
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