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Phonon Anharmonicity in Bulk Td-MoTe2

Published

Author(s)

Albert Davydov, Sergiy Krylyuk, Irina Kalish, Ryan Beams, Patrick Vora

Abstract

We examine anharmonic contributions to the optical phonon frequency in bulk Td-MoTe2 phase through temperature-dependent Raman spectroscopy. At temperatures greater than 100 K we find that the optical phonon modes redshift linearly with temperature in agreement with the Gruneisen model. Below 100 K the phonon frequency exhibits nonlinear temperature dependence that arises from phonon-phonon scattering processes where optical phonons decay into multiple acoustic phonons. Furthermore, the highest frequency Raman modes show changes in intensity and linewidth near T~250 K that correlate well with the Td -> 1T' structural phase transition. These results demonstrate that phonon-phonon interactions dominate anharmonic contributions at low temperatures in bulk Td-MoTe2, an experimental regime that is currently of intense focus in efforts to understand Weyle semimetals.
Citation
Applied Physics Letters

Keywords

Weyle semimetal, 2D material, MoTe2, Raman spectroscopy

Citation

Davydov, A. , Krylyuk, S. , Kalish, I. , Beams, R. and Vora, P. (2016), Phonon Anharmonicity in Bulk Td-MoTe2, Applied Physics Letters (Accessed April 21, 2024)
Created July 18, 2016, Updated March 15, 2017