Detection of Boson Peak of Densified Silica Glass by Terahertz Time-Domain Spectroscopy

ORAL

Abstract

We performed terahertz time-domain spectroscopy on densified silica glasses to investigate the boson peak (BP) dynamics. BP is a low energy excitation universally observed in the THz region of the glass material. In the spectra of α(ν)/ν2 [α(ν) is the absorption coefficient], BP were observed. Infrared light-vibration coupling coefficient CIR(ν) was determined using the α(ν) and vibrational density of states g(ν) obtained from the low-temperature specific heat measurement, and the charge fluctuations of the densified silica glasses were quantitatively evaluated.

*This work was partially supported by JSPS KAKENHI Grants No. 17K14318 and No. 26287067, the Nippon Sheet Glass Foundation for Materials Science and Engineering, the Murata Science Foundation, and the Asahi Glass Foundation.

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Presenters

  • Tatsuya Mori

    • Division of Materials Science, University of Tsukuba

Authors

  • Tatsuya Mori

    • Division of Materials Science, University of Tsukuba

  • Koki Nakano

    • Division of Materials Science, University of Tsukuba

  • Yasuhiro Fujii

    • Department of Physical Sciences, Ritsumeikan University

  • Suguru Kitani

    • Materials and Structures Laboratory, Tokyo Institute of Technology

  • Shinji Kohara

    • Light/Quantum Beam Field, Research Center for Advanced Measurement and Characterization, National Institute for Materials Science

  • Norimasa Nishiyama

    • Materials and Structures Laboratory, Tokyo Institute of Technology

  • Atsunobu Masuno

    • Graduate School of Science and Technology, Hirosaki University

  • Akitoshi Koreeda

    • Department of Physical Sciences, Ritsumeikan University

  • Hitoshi Kawaji

    • Materials and Structures Laboratory, Tokyo Institute of Technology

  • Seiji Kojima

    • University of Tsukuba
    • Division of Materials Science, University of Tsukuba
    • Graduate School of Pure and Applied Sciences, University of Tsukuba