Abstract
Pristine graphite is a highly anisotropic semimetal exhibiting weakly overlapping conduction and valence bands with approximate mirror symmetry. These π bands exhibit small basal plane electronic masses. In the lowest order of approximation (rigid band model [1]) the electrical properties of donor- and acceptor-type graphite intercalation compounds (GICs) [2,3] are determined by shifting the Fermi level up (donors) or down (acceptors) in the rigid π band, consistent with the charge transferred between the carbon and intercalate layers. The rigid band model, however, does not address the effects which might arise from the new c-axis periodicity (stage index), in-plane zone folding [4] of the π band associated with the intercalate layer superlattice (if one exists), or the intercalate-derived states themselves. Considerable progress has been made in our ability to account for these effects, and this has come from the interplay of energy band theory and many diverse experimental probes.
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Eklund, P.C., Yang, M.H., Doll, G.L. (1986). Optical Properties of Donor-Type Graphite Intercalation Compounds. In: Dresselhaus, M.S. (eds) Intercalation in Layered Materials. NATO ASI Series, vol 148. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-5556-5_20
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