Directional sub-femtosecond charge transfer dynamics and the dimensionality of 1T-TaS₂.

ABSTRACT: For the layered transition metal dichalcogenide 1T-TaS₂, we establish through a unique experimental approach and density functional theory, how ultrafast charge transfer in 1T-TaS₂ takes on isotropic three-dimensional character or anisotropic two-dimensional character, depending on the commensurability of the charge density wave phases of 1T-TaS₂. The X-ray spectroscopic core-hole-clock method prepares selectively in- and out-of-plane polarized sulfur 3p orbital occupation with respect to the 1T-TaS₂ planes and monitors sub-femtosecond wave packet delocalization. Despite being a prototypical two-dimensional material, isotropic three-dimensional charge transfer is found in the commensurate charge density wave phase (CCDW), indicating strong coupli

SUBMITTER: Kuhn D 

PROVIDER: S-EPMC6346016 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature