High-Energy Limit of Massless Dirac Fermions in Multilayer Graphene using Magneto-Optical Transmission Spectroscopy

by: P Plochocka, C Faugeras, M Orlita, ML Sadowski, G Martinez, M Potemski, MO Goerbig, JN Fuchs, C Berger, WA de Heer

Physical Review Letters, Vol. 100, No. 8. (2008)

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Abstract

We have investigated the absorption spectrum of multilayer graphene in high magnetic fields. The low-energy part of the spectrum of electrons in graphene is well described by the relativistic Dirac equation with a linear dispersion relation. However, at higher energies (>500 meV) a deviation from the ideal behavior of Dirac particles is observed. At an energy of 1.25 eV, the deviation from linearity is 40 meV. This result is in good agreement with the theoretical model, which includes trigonal warping of the Fermi surface and higher-order band corrections. Polarization-resolved measurements show no observable electron-hole asymmetry.

@article{citeulike:2805176, abstract = {We have investigated the absorption spectrum of multilayer graphene in high magnetic fields. The low-energy part of the spectrum of electrons in graphene is well described by the relativistic Dirac equation with a linear dispersion relation. However, at higher energies (\>500 meV) a deviation from the ideal behavior of Dirac particles is observed. At an energy of 1.25\ eV, the deviation from linearity is 40 meV. This result is in good agreement with the theoretical model, which includes trigonal warping of the Fermi surface and higher-order band corrections. Polarization-resolved measurements show no observable electron-hole asymmetry.}, author = {Plochocka, P. and Faugeras, C. and Orlita, M. and Sadowski, M. L. and Martinez, G. and Potemski, M. and Goerbig, M. O. and Fuchs, J. N. and Berger, C. and de Heer, W. A. }, citeulike-article-id = {2805176}, doi = {http://dx.doi.org/10.1103/PhysRevLett.100.087401}, journal = {Physical Review Letters}, keywords = {experimental, graphene, optics}, number = {8}, posted-at = {2008-05-16 13:15:27}, priority = {2}, publisher = {APS}, title = {High-Energy Limit of Massless Dirac Fermions in Multilayer Graphene using Magneto-Optical Transmission Spectroscopy}, url = {http://dx.doi.org/10.1103/PhysRevLett.100.087401}, volume = {100}, year = {2008} }

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TY - JOUR ID - citeulike:2805176 L3 - citeulike-article-id:2805176 TI - High-Energy Limit of Massless Dirac Fermions in Multilayer Graphene using Magneto-Optical Transmission Spectroscopy JF - Physical Review Letters VL - 100 IS - 8 PB - APS N2 - We have investigated the absorption spectrum of multilayer graphene in high magnetic fields. The low-energy part of the spectrum of electrons in graphene is well described by the relativistic Dirac equation with a linear dispersion relation. However, at higher energies (>500 meV) a deviation from the ideal behavior of Dirac particles is observed. At an energy of 1.25 eV, the deviation from linearity is 40 meV. This result is in good agreement with the theoretical model, which includes trigonal warping of the Fermi surface and higher-order band corrections. Polarization-resolved measurements show no observable electron-hole asymmetry. KW - experimental KW - graphene KW - optics AU - Plochocka, P AU - Faugeras, C AU - Orlita, M AU - Sadowski, ML AU - Martinez, G AU - Potemski, M AU - Goerbig, MO AU - Fuchs, JN AU - Berger, C AU - de Heer, WA PY - 2008/// UR - http://dx.doi.org/10.1103/PhysRevLett.100.087401 ER -

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