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Akitoshi Koreeda,Seishiro Saikan 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
Quasielastic light scattering (QELS) in dielectric crystals has been studied in the view-point of nonequilibrium phenomenology. It has been found that the observed double QELS can be ascribed to the two limiting characteristics of a \phonon gas": the two linewidths re°ect the time scales for the nonequilibrium kinetic processes and for the equilibrated collective motions of the constituent phonons, respectively._
Boson peak dynamics of glassy glucose studied by integrated terahertz-band spectroscopy
Kabeya, Mikitoshi,Mori, Tatsuya,Fujii, Yasuhiro,Koreeda, Akitoshi,Lee, Byoung Wan,Ko, Jae-Hyeon,Kojima, Seiji American Physical Society 2016 Physical Review B Vol.94 No.22
<P>We performed terahertz time-domain spectroscopy, low-frequency Raman scattering, and Brillouin light scattering on vitreous glucose to investigate the boson peak (BP) dynamics. In the spectra of alpha(nu)/nu(2) [alpha(nu) is the absorption coefficient], the BP is clearly observed around 1.1 THz. Correspondingly, the complex dielectric constant spectra show a universal resonancelike behavior only below the BP frequency. As an analytical scheme, we propose the relative light-vibration coupling coefficient (RCC), which is obtainable from the combination of the far-infrared and Raman spectra. The RCC reveals that the infrared light-vibration coupling coefficient C-IR(nu) of the vitreous glucose behaves linearly on frequency which deviates from Taraskin's model of C-IR(nu) = A + B nu(2) [S. N. Taraskin et al., Phys. Rev. Lett. 97, 055504 (2006)]. The linearity of C-IR(nu) might require modification of the second term of the model. The measured transverse sound velocity shows an apparent discontinuity with the flattened mode observed in the inelastic neutron scattering study [N. Violini et al., Phys. Rev. B 85, 134204 (2012)] and suggests a coupling between the transverse acoustic and flattened modes.</P>