Self-consistent effective-mass theory for intralayer screening in graphite intercalation compounds
- 15 February 1984
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 29 (4), 1685-1694
- https://doi.org/10.1103/physrevb.29.1685
Abstract
The effective-mass-approximation differential equations appropriate for impurities in a graphite host are constructed and are used to solve self-consistently for the screening response surrounding a single intercalant atom. The screening cloud is found to have a very slow algebraic decay with a characteristic length of 3.8 Å in the case studied. This rather long length is due to both the semimetallic and the two-dimensional character of graphite. A Thomas-Fermi description of screening is found to be adequate, but a linear-response theory is not. From these results we conclude that the transferred charge in alkali-metal—graphite intercalation compounds is distributed nearly homogeneously on a carbon plane. We discuss recent theoretical and experimental work in light of these results.Keywords
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