Our detailed Angle Resolved Photoemission Spectroscopy (ARPES) study of 2H-TaS2, 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 Tcdw 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-TaS2, 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.
@article{arxiv.1805.03580,
title = {Spectroscopic signature of the $\mathbf{k}$-dependent electron-phonon coupling in $2H$-TaS$_2$},
author = {K. Wijayaratne and J. Zhao and C. D. Malliakas and D. Y. Chung and M. G. Kanatzidis and U. Chatterjee},
journal= {arXiv preprint arXiv:1805.03580},
year = {2018}
}