Terahertz Time-Domain Spectroscopy of Alkali Borate Glass: Boson Peak Dynamics

ORAL

Abstract

The boson peak (BP) is a universal feature of amorphous materials and it appears in the spectra of g(ν)/ν2 (g(ν): vibrational density of states), in the terahertz region. The BP can be famously detected by inelastic neutron scattering, low-temperature specific heat, and Raman scattering. Recently, we confirmed that terahertz time-domain spectroscopy (THz-TDS) is suitable to detect the BP. The BP in the infrared (IR) spectra appears in the spectrum of α(ν)/ν2 (α(ν): absorption coefficient). In this study, we investigate the BP dynamics of lithium borate glass by THz-TDS and evaluate IR light-vibration coupling coefficient.

*This work was partially supported by JSPS KAKENHI Grants No. 17K14318, No. 18H04476 and No. 26287067, 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

  • Yuta Iijima

    • Division of Materials Science, University of Tsukuba

  • Yasuhiro Fujii

    • Department of Physical Sciences, Ritsumeikan University

  • Suguru Kitani

    • Laboratory for Materials and Structures, Tokyo Institute of Technology

  • Jae-Hyon Ko

    • Department of Physics, Hallym University

  • Akitoshi Koreeda

    • Department of Physical Sciences, Ritsumeikan University

  • Hitoshi Kawaji

    • Laboratory for Materials and Structures, Tokyo Institute of Technology

  • Seiji Kojima

    • Division of Materials Science, University of Tsukuba