Scanning tunneling spectroscopy of graphite and intercalates

Using the same method of our previous calculations for graphite, we discuss Scanning Tunneling Spectroscopy of LiC₆chosen as the simplest prototype donor graphite intercalate. Most of the spectral features can be qualitatively interpreted by a rigid band shift of ∼ 2eV over clean graphite. However a few exceptions occur, the most noticeable being a split π* state rather different from graphite. The corrugation ξ(V) is in general smaller than in graphite, in particular ξ(0) falls from ∼1-1.5 Å (graphite) to ∼0.2-0.4 Å (LiC₆). The corrugation of LiC₆falls rapidly to zero with increasing voltage, due to tunneling into the smooth empty interlayer state.