Spectroscopic signature of the $\mathbf{k}$-dependent electron-phonon coupling in $2H$-TaS$_2$
| Autor: | Wijayaratne, K., Zhao, J., Malliakas, C. D., Chung, D. Y., Kanatzidis, M. G., Chatterjee, U. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Journal of Materials Chemistry C, V 5, pp 11310, 2017 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1039/C7TC02641B |
| Popis: | 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 $\it{T}_{\text{cdw}}\,$ 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. Comment: 6 pages, 3 figures |
| Databáze: | arXiv |
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