Phonon Anharmonicity in Bulk $T_d$-MoTe$_2$

Jaydeep Joshi; Iris Stone; Ryan Beams; Sergiy Krylyuk; Irina Kalish; Albert Davydov; Patrick Vora

doi:10.1063/1.4959099

paper

Phonon Anharmonicity in Bulk $T_{d}$ -MoTe $_{2}$

arXiv:1606.03050 · doi:10.1063/1.4959099

Abstract

We examine anharmonic contributions to the optical phonon modes in bulk $T_{d}$ -MoTe $_{2}$ through temperature-dependent Raman spectroscopy. At temperatures ranging from 100 K to 200 K, we find that all modes redshift linearly with temperature in agreement with the Grüneisen model. However, below 100 K we observe nonlinear temperature-dependent frequency shifts in some modes. We demonstrate that this anharmonic behavior is consistent with the decay of an optical phonon into multiple acoustic phonons. Furthermore, the highest frequency Raman modes show large changes in intensity and linewidth near $T \approx 250$ K that correlate well with the $T_{d} \to 1 T^{'}$ structural phase transition. These results suggest that phonon-phonon interactions can dominate anharmonic contributions at low temperatures in bulk $T_{d}$ -MoTe $_{2}$ , an experimental regime that is currently receiving attention in efforts to understand Weyl semimetals.

14 pages, 3 figures, 1 table

Phonon Anharmonicity in Bulk $T_{d}$ -MoTe $_{2}$

Abstract

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Phonon Anharmonicity in Bulk Td​-MoTe2​

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Phonon Anharmonicity in Bulk $T_{d}$ -MoTe $_{2}$