Magnetoplasmons and SU(4) symmetry in graphene
Andrea M. Fischer, Rudolf A. Roemer, Alexander B. Dzyubenko
TL;DR
This paper investigates magnetoplasmons in graphene under strong magnetic fields, highlighting the SU(4) symmetry from spin and valley pseudospin, and uses Young diagrams to predict excitation degeneracies, revealing a meson-like multiplet structure.
Contribution
It introduces a novel application of Young diagrams to analyze SU(4) symmetry and predicts the degeneracy structure of magnetoplasmon excitations in graphene.
Findings
Degeneracies of excitations are predicted using Young diagrams.
The multiplet structure resembles mesons from quark models.
SU(4) symmetry plays a key role in excitation properties.
Abstract
We study magnetoplasmons or neutral collective excitations of graphene in a strong perpendicular magnetic field, which can be modelled as bound electron-hole pairs. The SU(4) symmetry of graphene arising from spin and valley pseudospin degrees of freedom is explored using Young diagrams to correctly predict the degeneracies of these excitations. The multiplet structure of the states is identical to that of mesons composed of first and second generation quarks.
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