370 research outputs found
Preparation and photoemission investigation of bulk-like a-Mn films on W(110)
We report the successful stabilization of a thick bulk-like, distorted
-Mn film with (110) orientation on a W(110) substrate. The observed
overstructure for the Mn film with respect to the original W(110)
low-energy electron diffraction pattern is consistent with the presented
structure model. The possibility to stabilize such a pseudomorphic Mn film is
supported by density functional total energy calculations. Angle-resolved
photoemission spectra of the stabilized -Mn(110) film show weak
dispersions of the valence band electronic states in accordance with the large
unit cell.Comment: 11 pages; 5 figure
Electronic structure, imaging contrast and chemical reactivity of graphene moir\'e on metals
Realization of graphene moir\'e superstructures on the surface of 4d and 5d
transition metals offers templates with periodically modulated electron
density, which is responsible for a number of fascinating effects, including
the formation of quantum dots and the site selective adsorption of organic
molecules or metal clusters on graphene. Here, applying the combination of
scanning probe microscopy/spectroscopy and the density functional theory
calculations, we gain a profound insight into the electronic and topographic
contributions to the imaging contrast of the epitaxial graphene/Ir(111) system.
We show directly that in STM imaging the electronic contribution is prevailing
compared to the topographic one. In the force microscopy and spectroscopy
experiments we observe a variation of the interaction strength between the tip
and high-symmetry places within the graphene moir\'e supercell, which determine
the adsorption cites for molecules or metal clusters on graphene/Ir(111).Comment: submitted on Sep, 6th 201
- …