Plasmon Evolution and Charge-Density Wave Suppression in Potassium Intercalated Tantalum Diselenide

Abstract

We have investigated the influence of potassium intercalation on the formation of the charge-density wave (CDW) instability in 2H-tantalum diselenide by means of Electron Energy-Loss Spectroscopy and density functional theory. Our observations are consistent with a filling of the conduction band as indicated by a substantial decrease of the plasma frequency in experiment and theory. In addition, elastic scattering clearly points to a destruction of the CDW upon intercalation as can be seen by a vanishing of the corresponding superstructures. This is accompanied by a new superstructure, which can be attributed to the intercalated potassium. Based on the behavior of the c-axis upon intercalation we argue in favor of interlayer-sites for the alkali-metal and that the lattice remains in the 2H-modification.

References in corpus (9)

• Superconductivity in Cu_xTiSe_2
• Pseudogap and charge density waves in two dimensions
• Fabrication and superconductivity of NaxTaS2 crystals
• A novel mechanism of charge density wave in a transition metal dichalcogenide
• The Effect of Charge Order on the Plasmon Dispersion in Transition-Metal Dichalcogenides
• Optical study of the charge-density-wave mechanism in 2$H$-TaS${}_2$ and Na${}_x$TaS${}_2$
• Coexistence of gapless excitations and commensurate charge-density wave in the 2H-transition metal dichalcogenides
• Temperature-dependent Fermi surface of 2H-TaSe2 driven by competing density wave order fluctuations
• Competing charge density waves and temperature-dependent nesting in 2H-TaSe2

Cited by in corpus (9)

• Plasmons in metallic monolayer and bilayer transition metal dichalcogenides
• Plasmons in the van der Waals charge-density-wave material 2H-TaSe2
• Valley Plasmonics in the Dichalcogenides
• Doping Dependence of the Plasmon Dispersion in 2H-Tantalum-Diselenide
• Potassium-intercalated bulk HfS${}_2$ and HfSe${}_2$: Phase stability, structure, and electronic structure
• Electron-energy-loss and time-dependent density functional theory study on the plasmon dispersion in 2H-NbS2
• Controlling charge density order in 2H-TaSe${}_2$ using a van Hove singularity
• 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