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Spin-density wave state in simple hexagonal graphite
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DOI：10.1103/PhysRevB.97.075131.png)
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Abstract
En 中文
Simple hexagonal graphite, also known as AA graphite, is a metastable configuration of graphite. Using tight-binding approximation, it is easy to show that AA graphite is a metal with well-defined Fermi surface. The Fermi surface consists of two sheets, each shaped like a rugby ball. One sheet corresponds to electron states, another corresponds to hole states. The Fermi surface demonstrates good nesting: a suitable translation in the reciprocal space superposes one sheet onto another. In the presence of the electron-electron repulsion, a nested Fermi surface is unstable with respect to spin-density-wave ordering. This instability is studied using the mean-field theory at zero temperature, and the spin-density-wave order parameter is evaluated.
Keywords:
ELECTRONIC-PROPERTIES
ANTIFERROMAGNETISM
1ST-PRINCIPLES
TRANSITION
FIELD
MODEL
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