Spectroscopic signature of the $\mathbf{k}$-dependent electron-phonon coupling in $2H$-TaS${}_2$

Abstract

Our detailed Angle Resolved Photoemission Spectroscopy (ARPES) study of $2H$-TaS${}_2$, a canonical incommensurate charge density wave (CDW) material, illustrates pronounced many-body renormalization in the system, which is manifested by the presence of multiple kink structures in the electronic dispersions. Temperature-dependent measurements reveal that these kink structures persist even at temperatures higher than the charge density wave transition temperature $T_{\text{cdw}}$ and the energy locations of the kinks are practically temperature-independent. Correlating kink energies with the published Raman scattering data and the theoretically calculated phonon spectrum of $2H$-TaS${}_2$, we conclude phononic mechanism for these kinks. We have also detected momentum-anisotropy in the band renormalization, which in turn indicates momentum-dependence of the electron-phonon coupling of the system.

arXiv comment6 pages, 3 figures

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• Probing enhanced superconductivity in van der Waals polytypes of V${}_x$TaS${}_2$
• Correlation-driven origin of shallow electron pocket in Co${}_{1/3}$TaS${}_2$ revealed by ARPES and cluster perturbation theory
• Plasmon Engineering in Intercalated 2H-TaS${}_2$