SU(4) spin waves in the $ν=\pm1$ quantum Hall ferromagnet in graphene
Jonathan Atteia,
Mark Oliver Goerbig
Abstract:We study generalized spin waves in graphene under a strong magnetic field when the Landaulevel filling factor is ν = ±1. In this case, the ground state is a particular SU(4) quantum Hall ferromagnet, in which not only the physical spin is fully polarized but also the pseudo-spin associated with the valley degree of freedom. The nature of the ground state and the spin-valley polarization depend on explicit symmetry breaking terms that are also reflected in the generalised spin-wave spectrum. In addition to pure… Show more
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