Continuous tuning of electronic correlations by alkali adsorption on layered 1T-TaS2.
Angle-resolved photoemission spectroscopy shows that a Mott-Hubbard type metal-insulator transition occurs at the Rb adsorbed surface of the layered charge-density-wave compound 1T-TaS2. The transition is driven by adsorption induced modifications of the charge-density wave and of the interlayer coupling, leading to an increase of the on-site Coulomb correlation energy and a narrowing of the Ta 5d band perpendicular to the layers, respectively. The continuous rearrangement of spectral weight is measured live during the deposition process.
Rossnagel
K
K
Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel, Germany. rossnagel@physik.uni-kiel.de
Rotenberg
Eli
E
Koh
H
H
Smith
N V
NV
Kipp
L
L