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  • Title: Dirac fermions at the H point of graphite: magnetotransmission studies.
    Author: Orlita M, Faugeras C, Martinez G, Maude DK, Sadowski ML, Potemski M.
    Journal: Phys Rev Lett; 2008 Apr 04; 100(13):136403. PubMed ID: 18517976.
    Abstract:
    We report on far infrared magnetotransmission measurements on a thin graphite sample prepared by exfoliation of highly oriented pyrolytic graphite. In a magnetic field, absorption lines exhibiting a blueshift proportional to sqrt[B] 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[over ] =( 1.02+/-0.02) x 10(6) m/s and the pseudogap |Delta| 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.
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