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  • Title: SU(4) Skyrmions in the ν=±1 Quantum Hall State of Graphene.
    Author: Lian Y, Rosch A, Goerbig MO.
    Journal: Phys Rev Lett; 2016 Jul 29; 117(5):056806. PubMed ID: 27517789.
    Abstract:
    We explore different Skyrmion types in the lowest Landau level of graphene at a filling factor ν=±1. In addition to the formation of spin and valley pseudospin Skyrmions, we show that another type of spin-valley entangled Skyrmions can be stabilized in graphene due to an approximate SU(4) spin-valley symmetry that is affected by sublattice symmetry-breaking terms. These Skyrmions have a clear signature in spin-resolved density measurements on the lattice scale, and we discuss the expected patterns for the different Skyrmion types.
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