Abstract
The unoccupied band structure of single-crystal graphite above the vacuum level is studied by very-low-energy electron diffraction. The position and dispersion of the three-dimensional bands coupling to vacuum, including the so-called interlayer state, are determined. The three-dimensional character prevails in the unoccupied bands, but quasi-two-dimensionality of this layered material results in their strongly non-free-electron dispersion. By comparison to a state-of-art density-functional and a many-body band calculation we identify self-energy corrections.
- Received 21 September 1999
DOI:https://doi.org/10.1103/PhysRevB.61.4994
©2000 American Physical Society