Comparative Raman study of Weyl semimetals TaAs, NbAs, TaP and NbP

Abstract

We report a comparative polarized Raman study of Weyl semimetals TaAs, NbAs, TaP and NbP. The evolution of the phonon frequencies with the sample composition allows us to determine experimentally which atoms are mainly involved for each vibration mode. Our results confirm previous first-principles calculations indicating that the A${}_1$, B${}_1(2)$, E$(2)$ and E$(3)$ modes involve mainly the As(P) atoms, the B${}_1(1)$ mode is mainly related to Ta(Nb) atoms, and the E$(1)$ mode involves both kinds of atoms. By comparing the energy of the different modes, we establish that the B${}_1(1)$, B${}_1(2)$, E$(2)$ and E$(3)$ become harder with chemical pressure increasing. This behavior differs from our observation on the A${}_1$ mode, which decreases in energy, in contrast to its behavior under external pressure.

4 pages, 3 figures, 1 table. 1 new figure added

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Cited by in corpus (7)

• Signatures of the chiral anomaly in phonon dynamics
• Uncovering Electron-Phonon Scattering and Phonon Dynamics in Type-I Weyl Semimetals
• Optical conductivity of the Weyl semimetal NbP
• Anomalous Transport Signatures in Weyl Semimetals with Point Defects
• Pressure-induced Lifshitz transition in NbP: Raman, x-ray diffraction, electrical transport and density functional theory
• Efficient spin-to-charge interconversion in Weyl semimetal TaP at room temperature
• Nodal vacancy bound states and resonances in three-dimensional Weyl semimetals