title: Atypical fractional quantum Hall effect in graphene at filling factor 1/3.
abstract: We study, with the help of exact-diagonalization calculations, a four-component trial wave function that may be relevant for the recently observed graphene fractional quantum Hall state at a filling factor ν(G) = 1/3. Although it is adiabatically connected to a 1/3 Laughlin state in the upper spin branch, with SU(2) valley-isospin ferromagnetic ordering and a completely filled lower spin branch, it reveals physical properties beyond such a state that is the natural ground state for a large Zeeman effect. Most saliently, it possesses at experimentally relevant values of the Zeeman gap low-energy spin-flip excitations that may be unveiled in inelastic light-scattering experiments.
authors.affiliation: CNRS UMR, Univ. Paris-Sud, Orsay, France.
authors.forename: Z
authors.initials: Z
authors.lastname: Papić
authors.forename: M O
authors.initials: MO
authors.lastname: Goerbig
authors.forename: N
authors.initials: N
authors.lastname: Regnault