Graphite from the viewpoint of Landau level spectroscopy: an effective graphene bilayer and monolayer
We describe an infrared transmission study of a thin layer of bulk graphite in magnetic fields up to B=34 T. Two series of absorption lines whose energy scales as sqrt[B] and B are present in the spectra and identified as contributions of massless holes at the H point and massive electrons in the vi...
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Published in | Physical review letters Vol. 102; no. 16; p. 166401 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
24.04.2009
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Online Access | Get more information |
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Summary: | We describe an infrared transmission study of a thin layer of bulk graphite in magnetic fields up to B=34 T. Two series of absorption lines whose energy scales as sqrt[B] and B are present in the spectra and identified as contributions of massless holes at the H point and massive electrons in the vicinity of the K point, respectively. We find that the optical response of the K point electrons corresponds, over a wide range of energy and magnetic field, to a graphene bilayer with an effective interlayer coupling 2gamma_{1}, twice the value for a real graphene bilayer, which reflects the crystal ordering of bulk graphite along the c axis. The K point electrons thus behave as massive Dirac fermions with a mass enhanced twice in comparison to a true graphene bilayer. |
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ISSN: | 0031-9007 |
DOI: | 10.1103/physrevlett.102.166401 |