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- W2533366028 abstract "We present a Raman scattering study of optical phonons in hexagonal BN for temperatures ranging from 80 to 600 K. The experiments were performed on high-quality, single-crystalline hexagonal BN platelets. The observed temperature dependence of the frequencies and linewidths of both Raman active ${E}_{2g}$ optical phonons is analyzed in the framework of anharmonic decay theory, and possible decay channels are discussed in the light of density-functional theory calculations. With increasing temperature, the ${E}_{2g}^{mathrm{high}}$ mode displays strong anharmonic interactions, with a linewidth increase that indicates an important contribution of four-phonon processes and a marked frequency downshift that can be attributed to a substantial effect of the four-phonon scattering processes (quartic anharmonicity). In contrast, the ${E}_{2g}^{mathrm{low}}$ mode displays a very narrow linewidth and weak anharmonic interactions, with a frequency downshift that is primarily accounted for by the thermal expansion of the interlayer spacing." @default.
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- W2533366028 date "2016-10-20" @default.
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- W2533366028 title "Temperature dependence of Raman-active phonons and anharmonic interactions in layered hexagonal BN" @default.
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- W2533366028 doi "https://doi.org/10.1103/physrevb.94.155435" @default.
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