Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-06-28
Phys. Rev. B 84, 115404 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 1 table
Scientific paper
We study the density of states in graphene at high magnetic field, when the physics is dominated by strong correlations between electrons. In particular we use the method of Haldane pseudopotentials to focus on almost empty or almost filled Landau levels. We find that, besides the usual Landau level peaks, additional peaks ("sashes") appear in the spectrum. The energies of these peaks are determined by the strength of Haldane's pseudopotentials, but as opposed to the usual two-dimensional gas, when there is a one-to-one correspondence between a Haldane pseudopotential and a peak in the spectrum, the energy of each peak is determined in general by a combination of more than one pseudopotential values. An eventual measure of these peak in the density of states spectrum of graphene would allow one to determine the value of the pseudopotentials in graphene, and thus test the strength of the interactions in this system.
Bena Cristina
Goerbig Mark O.
Lim Lih-King
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