A Raman probe of phonons and electron-phonon interactions in the Weyl semimetal NbIrTe(4).
A Raman probe of phonons and electron-phonon interactions in the Weyl semimetal NbIrTe(4).
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DOI:
10.1038/s41598-021-87302-y
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发表时间:
2021-04-14
影响因子:
4.6
通讯作者:
Smith LM
中科院分区:
文献类型:
--
作者:
Shojaei IA;Pournia S;Le C;Ortiz BR;Jnawali G;Zhang FC;Wilson SD;Jackson HE;Smith LM
There is tremendous interest in measuring the strong electron–phonon interactions seen in topological Weyl semimetals. The semimetal NbIrTe4 has been proposed to be a Type-II Weyl semimetal with 8 pairs of opposite Chirality Weyl nodes which are very close to the Fermi energy. We show using polarized angular-resolved micro-Raman scattering at two excitation energies that we can extract the phonon mode dependence of the Raman tensor elements from the shape of the scattering efficiency versus angle. This van der Waals semimetal with broken inversion symmetry and 24 atoms per unit cell has 69 possible phonon modes of which we measure 19 modes with frequencies and symmetries consistent with Density Functional Theory calculations. We show that these tensor elements vary substantially in a small energy range which reflects a strong variation of the electron–phonon coupling for these modes.
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