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
期刊:
影响因子:
4.6
通讯作者:
Smith LM
Smith LM
中科院分区:
综合性期刊3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

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人们对测量拓扑Weyl半金属中的强电子-声子相互作用非常感兴趣。半金属NbIrTe4被认为是一种ii型Weyl半金属,具有8对相反的手性Weyl节点,非常接近费米能量。我们展示了使用偏振角分辨微拉曼散射在两个激发能量下,我们可以从散射效率与角度的形状中提取拉曼张量元素的声子模式依赖关系。这种范德华半金属具有破碎的反演对称性和每单元24个原子,具有69种可能的声子模式,我们测量了其中19种模式的频率和对称性与密度泛函理论计算一致。我们表明,这些张量元素在一个小的能量范围内变化很大,这反映了这些模式的电子-声子耦合的强烈变化。
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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