Doping Dependence of the Plasmon Dispersion in 2H-Tantalum-Diselenide

Abstract

Inelastic electron scattering is applied to investigate the impact of potassium intercalation on the charge carrier plasmon energy and dispersion in the charge-density wave (CDW) bearing compound 2H-tantalum-diselenide. We observe an unususal doping dependence of the plasmon dispersion, which even changes sign upon alkali addition. In contrast to the continous energy shift of the plasmon position upon doping at lowest momentum transfer, its dispersion changes in a rather discontinuous manner. We argue that the observed dynamics can only be explained in a picture, where complex phenomena are taken into account including the suppression of the CDW upon doping as well as the interplay of the CDW and the plasma resonance.

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Cited by in corpus (6)

• Plasmons in the van der Waals charge-density-wave material 2H-TaSe2
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• Plasmons in MoS2 Studied via Experimental and Theoretical Correlation of Energy Loss Spectra
• Potassium-intercalated bulk HfS${}_2$ and HfSe${}_2$: Phase stability, structure, and electronic structure
• Semiconductor-to-Metal Transition in the Bulk of WSe2 upon Potassium Intercalation
• Investigation of potassium-intercalated bulk MoS${}_2$ using transmission electron energy-loss spectroscopy