Journal
PHYSICAL REVIEW B
Volume 72, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.72.075103
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We have studied charge excitations in graphite using inelastic x-ray scattering. The spectra were measured as a function of the momentum transfer, q, along the [100] (k(x)), [210] (k(y)), and [001] (k(z)) axes on a high-quality single-crystal sample. Anisotropic and periodic features representing the semimetallic electronic structure have been observed. These features are interpreted based on band structure obtained from the local density approximation. On the q parallel to k(x) and q parallel to k(y) spectra, periodic signals exhibiting the gap opening and closing of the pi bands have been observed. On the other hand, on q parallel to k(z) spectra, a forbidden excitation between the pi bands has been detected in the high q region.
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