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Sekiguchi, Fumiya

Institute for Chemical Research (ICR) Program-Specific Assistant Professor

Sekiguchi, Fumiya
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    Last Updated :2022/08/06

    Basic Information

    Academic Degree

    • 修士(理学)(東京大学)
    • 博士(理学)(東京大学)

    Language of Instruction

    • Japanese
    • English

    ID,URL

    researchmap URL

    list
      Last Updated :2022/08/06

      Research

      Research Topics, Overview of the research

      • Research Topics

        Ultrafast spectroscopy of solid state materials
      • Overview of the research

        Exploration of nonlinear and nonequilibrium phenomena induced by intense terahertz pulses

      Papers

      • Slowdown of photoexcited spin dynamics in the non-collinear spin-ordered phases in skyrmion host GaV4S8
        Fumiya Sekiguchi; Kestutis Budzinauskas; Prashant Padmanabhan; Rolf B. Versteeg; Vladimir Tsurkan; István Kézsmárki; Francesco Foggetti; Sergey Artyukhin; Paul H. M. van Loosdrecht
        Nature Communications, Dec. 2022
      • Nonequilibrium quasistationary spin disordered state in α−RuCl3
        R. B. Versteeg; A. Chiocchetta; F. Sekiguchi; A. Sahasrabudhe; J. Wagner; A. I. R. Aldea; K. Budzinauskas; Zhe Wang; V. Tsurkan; A. Loidl; D. I. Khomskii; S. Diehl; P. H. M. van Loosdrecht
        Physical Review B, 30 Jun. 2022
      • Size-controlled quantum dots reveal the impact of intraband transitions on high-order harmonic generation in solids
        Kotaro Nakagawa; Hideki Hirori; Shunsuke A. Sato; Hirokazu Tahara; Fumiya Sekiguchi; Go Yumoto; Masaki Saruyama; Ryota Sato; Toshiharu Teranishi; Yoshihiko Kanemitsu
        NATURE PHYSICS, Jun. 2022
      • Strong spin-orbit coupling inducing Autler-Townes effect in lead halide perovskite nanocrystals
        Go Yumoto; Hideki Hirori; Fumiya Sekiguchi; Ryota Sato; Masaki Saruyama; Toshiharu Teranishi; Yoshihiko Kanemitsu
        Nature Communications, Dec. 2021, Peer-reviewed
      • Generation of wavelength-tunable few-cycle pulses in the mid-infrared at repetition rates up to 10 kHz
        Yasuyuki Sanari; Fumiya Sekiguchi; Kotaro Nakagawa; Nobuhisa Ishii; Y. Kanemitsu; Hideki Hirori
        Optics Letters, 28 Sep. 2021
      • Ultrastrong coupling between THz phonons and photons caused by an enhanced vacuum electric field
        Zhenya Zhang; Hideki Hirori; Fumiya Sekiguchi; Ai Shimazaki; Yasuko Iwasaki; Tomoya Nakamura; Atsushi Wakamiya; Yoshihiko Kanemitsu
        Physical Review Research, 27 Jul. 2021
      • Interference effects in high-order harmonics from colloidal perovskite nanocrystals excited by an elliptically polarized laser
        Nakagawa, Kotaro; Hirori, Hideki; Sanari, Yasuyuki; Sekiguchi, Fumiya; Sato, Ryota; Saruyama, Masaki; Teranishi, Toshiharu; Kanemitsu, Yoshihiko
        Phys. Rev. Materials, 2021, Peer-reviewed
      • Enhancing the Hot-Phonon Bottleneck Effect in a Metal Halide Perovskite by Terahertz Phonon Excitation
        Sekiguchi, Fumiya; Hirori, Hideki; Yumoto, Go; Shimazaki, Ai; Nakamura, Tomoya; Wakamiya, Atsushi; Kanemitsu, Yoshihiko
        Phys. Rev. Lett., 2021, Peer-reviewed
      • Coupled dynamics of long-range and cluster-internal spin order in the cluster Mott insulator Cu2OSeO3
        R. B. Versteeg; J. Zhu; C. Boguschewski; F. Sekiguchi; A. Sahasrabudhe; K. Budzinauskas; P. Padmanabhan; P. Becker; D. Khomskii; P. H. M. van Loosdrecht
        PHYSICAL REVIEW B, Aug. 2019, Peer-reviewed
      • Optically Driven Collective Spin Excitations and Magnetization Dynamics in the Neel-type Skyrmion Host GaV4S8
        P. Padmanabhan; F. Sekiguchi; R. B. Versteeg; E. Slivina; Tsurkan, V; S. Bordacs; Kezsmarki, I; P. H. M. van Loosdrecht
        PHYSICAL REVIEW LETTERS, Mar. 2019, Peer-reviewed
      • Terahertz field-induced ionization and perturbed free induction decay of excitons in bulk GaAs
        Yuta Murotani; Masayuki Takayama; Fumiya Sekiguchi; Changsu Kim; Hidefumi Akiyama; Ryo Shimano
        JOURNAL OF PHYSICS D-APPLIED PHYSICS, Mar. 2018, Peer-reviewed
      • Rate Equation Analysis of the Dynamics of First-order Exciton Mott Transition
        Fumiya Sekiguchi; Ryo Shimano
        JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Oct. 2017, Peer-reviewed
      • Anomalous Metal Phase Emergent on the Verge of an Exciton Mott Transition
        Fumiya Sekiguchi; Toshimitsu Mochizuki; Changsu Kim; Hidefumi Akiyama; Loren N. Pfeiffer; Ken W. West; Ryo Shimano
        PHYSICAL REVIEW LETTERS, Feb. 2017, Peer-reviewed
      • Exciton Mott transition in GaAs studied by terahertz spectroscopy
        Fumiya Sekiguchi; Changsu Kim; Hidefumi Akiyama; Ryo Shimano
        ULTRAFAST PHENOMENA AND NANOPHOTONICS XXI, 2017, Peer-reviewed
      • Single-shot terahertz time-domain spectroscopy in pulsed high magnetic fields
        G. Timothy Noe; Ikufumi Katayama; Fumiya Katsutani; James J. Allred; Jeffrey A. Horowitz; David M. Sullivan; Qi Zhang; Fumiya Sekiguchi; Gary L. Woods; Matthias C. Hoffmann; Hiroyuki Nojiri; Jun Takeda; Junichiro Kono
        OPTICS EXPRESS, Dec. 2016, Peer-reviewed
      • Excitonic correlation in the Mott crossover regime in Ge
        Fumiya Sekiguchi; Ryo Shimano
        Physical Review B - Condensed Matter and Materials Physics, 06 Apr. 2015, Peer-reviewed
      • Excitonic correlation in the Mott crossover regime in Ge
        Fumiya Sekiguchi; Ryo Shimano
        PHYSICAL REVIEW B, Apr. 2015, Peer-reviewed
      • Terahertz spectroscopy of magnetoexciton in Ge under an uniaxial stress
        J. Y. Yoo; F. Sekiguchi; R. Shimano
        2013 38TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ), 2013, Peer-reviewed

      Misc.

      • Strong spin-orbit coupling induces ultrafast nonlinear optical responses in CsPbBr3 perovskite nanocrystals
        湯本郷; 廣理英基; 関口文哉; 佐藤良太; 猿山雅亮; 寺西利治; 金光義彦
        応用物理学会秋季学術講演会講演予稿集(CD-ROM), 2021
      • Observation of strong spin-orbit coupling induced Autler-Townes effect in CsPbBr3 nanocrystals
        湯本郷; 廣理英基; 関口文哉; 佐藤良太; 猿山雅亮; 寺西利治; 金光義彦
        日本物理学会講演概要集(CD-ROM), 2021
      • High-order harmonic generation from CdS semiconductor nanocrystals: the nanocrystal size and excitation intensity dependence.
        中川耕太郎; 佐成晏之; 関口文哉; 佐藤駿丞; 佐藤駿丞; 猿山雅亮; 佐藤良太; 寺西利治; 廣理英基; 金光義彦
        日本物理学会講演概要集(CD-ROM), 2021
      • Optically triggered coherent/incoherent spin dynamics in Neel-type skyrmion host lacunar spinel GaV4S8
        関口文哉; PADMANABHAN Prashant; BUDZINAUSKAS Kestutis; TSURKAN Vladimir; KEZSMARKI Istvan; VAN LOOSDRECHT Paul H. M.
        日本物理学会講演概要集(CD-ROM), 2020
      • High harmonic generation from nanoparticles and selection rules for circularly polarized fields
        中川耕太郎; 佐成晏之; 関口文哉; 佐藤良太; 猿山雅亮; 寺西利治; 廣理英基; 金光義彦
        日本物理学会講演概要集(CD-ROM), 2020
      • Ultrafast quench dynamics of photoluminescence in lead-halide perovskites induced by intense terahertz pulses
        関口文哉; 湯本郷; 廣理英基; 嶋崎愛; 中村智也; 若宮淳志; 金光義彦
        日本物理学会講演概要集(CD-ROM), 2020
      • Ionization and perturbed free induction decay of excitons induced by a terahertz pulse
        Murotani Y.; Takayama M.; Sekiguchi F.; Kim C.; Akiyama H.; Shimano R.
        Meeting Abstracts of the Physical Society of Japan, 2018
      • Dynamics of exciton Mott transition studied by optical pump-terahertz pump-optical probe spectroscopy
        Murotani Y.; Takayama M.; Matsunaga R.; Sekiguchi F.; Kim C.; Akiyama H.; Pfeiffer L. N.; West K. W.; Shimano R.
        Meeting Abstracts of the Physical Society of Japan, 2016
      • 21pPSA-42 Exciton Mott transition under resonant excitation of excitons in bulk GaAs studied by optical-pump optical-probe spectroscopy
        Murotani Y.; Sekiguchi F.; Mochizuki T.; Kim C.; Akiyama H.; Pfeiffer Loren N.; West Ken W.; Shimano R.
        Meeting Abstracts of the Physical Society of Japan, 2016
      • 22aBH-1 Dynamics of exciton Mott transition and emergence of anomalous metal phase under the resonant excitation of excitons
        Sekiguchi F.; Kim C.; Akiyama H.; Mochizuki T.; Pfeiffer Loren N.; West Ken W.; Shimano R.
        Meeting Abstracts of the Physical Society of Japan, 2016
      • 18aCF-7 Terahertz spectroscopy of high density electron-hole system in a bulk GaAs under the resonant excitation of excitons
        Sekiguchi F.; Kim C.; Akiyama H.; Mochizuki T.; Pfeiffer Loren N.; West Ken W.; Shimano R.
        Meeting Abstracts of the Physical Society of Japan, 2015
      • 18pPSA-23 The dynamics of terahertz-induced ionization and reformation of excitons in a bulk GaAs
        Takayama M.; Sekiguchi F.; Matsunaga R.; Mochizuki T.; Kim C.; Akiyama H.; Pfeiffer Loren N.; West Ken W.; Shimano R.
        Meeting Abstracts of the Physical Society of Japan, 2015
      • 29pCK-6 Excitonic resonance in photoluminescence from the electron-hole plasma in a bulk GaAs
        Sekiguchi F.; Yoshita M.; Ito T.; Mochizuki T.; Kim C.; Akiyama H.; Pfeiffer Loren N.; West Ken W.; Shimano R.
        Meeting Abstracts of the Physical Society of Japan, 2014
      • 8aAJ-11 Exciton Mott transition in hulk GaAs under the excition resonant excitation condition
        Sekiguchi F.; Yoshita M.; Ito T.; Mochizuki T.; Kim C.; Akiyama H.; Pfeiffer Loren N.; West Ken W.; Shimano R.
        Meeting Abstracts of the Physical Society of Japan, 2014
      • Terahertz spectroscopy of excitons in bulk GaAs
        Sekiguchi F.; Suzuki T.; Mochizuki T.; Kim C.; Akiyama H.; Pfeiffer L.N; West K.W.; Shimano R.
        Meeting Abstracts of the Physical Society of Japan, 2013
      • 27aBL-9 Terahertz spectroscopy of high density electron-hole system in Ge
        Sekiguchi F.; Yoo J. Y.; Suzuki T.; Shimano R.
        Meeting Abstracts of the Physical Society of Japan, 2012
      • 21aFJ-7 Observation of exciton inner transition in Ge by optical pump-THz probe spectroscopy
        Sekiguchi F.; Suzuki T.; Shimano R.
        Meeting Abstracts of the Physical Society of Japan, 2012

      Presentations

      • Photoinduced magnetization dynamics in the skyrmion-host lacunar spinel GaV4S8
        F. Sekiguchi; P. Padmanabhan; R. B; Versteeg; E. Slivina; S. Bordács; V. Tsurkan; I. Kézsmárki; P. H. M; van Loosdrecht
        DPG Spring Meeting of the Condensed Matter Section, Apr. 2019
      • Optically driven magnetization dynamics and coherent spin excitation in the cycloid and skyrmion-lattice phases of GaV4S8
        F. Sekiguchi; P. Padmanabhan; R. B; Versteeg; V. Tsurkan; I. Kézsmárki; P. H. M; van Loosdrecht
        International Conference, CRC1238 “Control and Dynamics of Quantum Materials”, Sep. 2018
      • Optically triggered magnetization dynamics and collective spin precession in skyrmion-host GaV4S8
        F. Sekiguchi; P. Padmanabhan; R. B; Versteeg; V. Tsurkan; I. Kézsmárki; P. H. M; van Loosdrecht
        DPG Spring Meeting of the Condensed Matter Section, Mar. 2018
      • Magnetization dynamics and coherent spin precession in GaV4S8 triggered by optical excitation
        F. Sekiguchi; P. Padmanabhan; R. B. Versteeg; I. Kézsmárki; P. H. M; van Loosdrecht
        Gordon Research Conference (Ultrafast Phenomena in Cooperative Systems), Feb. 2018
      • Exciton Mott transition in GaAs studied by terahertz spectroscopy
        F. Sekiguchi; C. Kim; H. Akiyama; R. Shimano
        SPIE Photonics West (Ultrafast Phenomena and Nanophotonics XXI), Jan. 2017, Invited
      • ”Mott transition" in excitonic system
        F. Sekiguchi; C. Kim; H. Akiyama; L. N. Pfeiffer; K. W. West; R. Shimano
        International Symposium on New Horizons in Condensed Matter Physics, Jun. 2016
      • Emergence of anomalous metallic phase in the vicinity of exciton Mott transition in bulk GaAs
        F. Sekiguchi; C. Kim; H. Akiyama; L. N. Pfeiffer; K. W. West; R. Shimano
        Gordon Research Conference (Ultrafast Phenomena in Cooperative Systems), Feb. 2016
      • Excitonic signature in the photoluminescence from electron-hole plasma in a bulk GaAs
        F. Sekiguchi; M. Yoshita; T. Ito; T. Mochizuki; C. Kim; H. Akiyama; L. N. Pfeiffer; K. W. West; R. Shimano
        International Conference on Spontaneous Coherence in Excitonic Systems (ICSCE) 7, Apr. 2014
      • Terahertz study of exciton Mott transition in Ge
        F. Sekiguchi; T. Suzuki; R. Shimano
        International Workshop on Optical Terahertz Science and Technology (OTST) 2013, Apr. 2013
      • Time-resolved observation of photo-excited carriers, exctions, and electron-hole droplet in Ge by terahertz time-domain spectroscopy
        F. Sekiguchi; J. Y. Yoo; T. Suzuki; R. Shimano
        International Symposium on Frontiers in THz Technology (FTT) 2012, Nov. 2012

      Awards

      • 23 Mar. 2016
        The University of Tokyo, 平成27年度 東京大学大学院理学系研究科 博士課程 研究奨励賞

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