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Article Dans Une Revue Physical Review Letters Année : 2008

Dirac fermions at the H point of graphite: Magneto-transmission studies

Résumé

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.

Dates et versions

hal-00413945 , version 1 (07-09-2009)

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Milan Orlita, Clément Faugeras, Gérard Martinez, Duncan Kennedy Maude, Marcin L. Sadowski, et al.. Dirac fermions at the H point of graphite: Magneto-transmission studies. Physical Review Letters, 2008, 100, pp.136403. ⟨hal-00413945⟩
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