0000000000326104

AUTHOR

Kanji Watanabe

showing 1 related works from this author

High-Pressure Softening of the Out-of-Plane A2u(Transverse-Optic) Mode of Hexagonal Boron Nitride Induced by Dynamical Buckling

2019

We investigate the highly anisotropic behavior of the in-plane and out-of-plane infrared-active phonons of hexagonal boron nitride by means of infrared reflectivity and absorption measurements under high pressure. Infrared reflectivity spectra at normal incidence on high-quality single crystals show strict fulfillment of selection rules and an unusually long E1u[transverse-optic (TO)] phonon lifetime. Accurate values of the dielectric constants at ambient pressure ϵ0= 6.96, ϵ∞= 4.95, ϵ 0= 3.37, and ϵ∞ = 2.84 have been determined from fits to the reflectivity spectra. The out-of-plane A2u phonon reflectivity band is revealed in measurements on an inclined facet, and absorption measurements a…

Materials sciencePhononReflectionAstrophysics::Cosmology and Extragalactic Astrophysics02 engineering and technologyNitride010402 general chemistry01 natural sciencesNitridesCondensed Matter::Materials Sciencechemistry.chemical_compoundCondensed Matter::SuperconductivityPhysical and Theoretical ChemistryAbsorption (electromagnetic radiation)AnisotropySofteningAstrophysics::Galaxy AstrophysicsCondensed matter physics021001 nanoscience & nanotechnology0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsBoron nitrideTransverse planeGeneral EnergychemistryBucklingBoron nitride[PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other][PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]CalculationsIII-V semiconductorsPhononsSingle crystalsAstrophysics::Earth and Planetary Astrophysics0210 nano-technology
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