Abstract
Collective charge density excitations in a semi-infinite Graphite Intercalation Compounds are studied. The general theory is formulated and applied to intraband surface plasmons in stage 1 compound and interband surface plasmons in stage 2 compound. It is found that the surface plasmons can exist for the wavevector q larger than a critical value q ∗, in analogy with semiconductor superlattices. Analytical expressions are derived for plasmon frequency and decay length.
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