Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-09-16
Phys. Rev. B 80, 085408 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 3 figures. Version accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.80.085408
A doped graphene layer in the integer quantum Hall regime reveals a highly unusual particle-hole excitation spectrum, which is calculated from the dynamical polarizability in the random phase approximation. We find that the elementary neutral excitations in graphene in a magnetic field are unlike those of a standard two-dimensional electron gas (2DEG): in addition to the upper-hybrid mode, the particle-hole spectrum is reorganized in linear magneto-plasmons that disperse roughly parallel to $\omega=v_F q$, instead of the usual horizontal (almost dispersionless) magneto-excitons. These modes could be detected in an inelastic light scattering experiment.
Fuchs Jean-Noël
Goerbig Mark O.
Roldan Rafael
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