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Simple hexagonal graphite, also known as AA graphite, is a metastableconfiguration of graphite. Using tight-binding approximation it is easy todemonstrate that AA graphite is a metal with well-defined Fermi surface. TheFermi surface consists of two sheets, each shaped like a rugby ball. One sheetcorresponds to electron states, another corresponds to hole states. The Fermisurface demonstrates good nesting: a suitable translation in the reciprocalspace superposes one sheet onto another. In the presence of theelectron-electron repulsion a nested Fermi surface is unstable with respect tospin-density wave ordering. This instability is studied using the mean-fieldtheory at zero temperature, and the spin-density wave order parameter isevaluated.

Spin-density wave state in simple hexagonal graphite