Dirac fermions at the H point of graphite: Magneto-transmission studies
arXiv:0709.2681 · doi:10.1103/PhysRevLett.100.136403
Abstract
We report on far infrared magneto-transmission measurements on a thin graphite sample prepared by exfoliation of highly oriented pyrolytic graphite. In magnetic field, absorption lines exhibiting a blue-shift proportional to sqrtB are observed. This is a fingerprint for massless Dirac holes at the H point in bulk graphite. The Fermi velocity is found to be c*=1.02x10^6 m/s and the pseudogap at the H point is estimated to be below 10 meV. Although the holes behave to a first approximation as a strictly 2D gas of Dirac fermions, the full 3D band structure has to be taken into account to explain all the observed spectral features.
arXiv comment4 pages, 4 figures, to appear in Phys. Rev. Lett
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