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Even Denominator Fractional Quantum Hall States in the Zeroth Landau Level of ABA Trilayer Graphene
Tanima Chanda1, Simrandeep Kaur1, Harsimran Singh1
1Indian Institute of Science, Department of Physics, Bangalore 560012, India.
Abstract:
Even-denominator fractional quantum Hall states at half-filling are of particular interest because they can host non-Abelian quasiparticles. Here, we report the emergence of such states in the zeroth Landau level (N=0) of ABA trilayer graphene (TLG), challenging the conventional expectation that they are confined to the first excited Landau level. We observe robust incompressible states at ν=7/2, 9/2, and 5/2 with their associated Levin-Halperin daughter states: ν=59/17 and 46/13 near 7/2; ν=58/13 and 77/17 near 9/2; and ν=43/17 near 5/2. These states appear exclusively within a finite displacement-field window coincident with crossings between symmetry-broken N=0 Landau levels carrying distinct isospin indices. The quantitative correspondence between the calculated crossing loci and the experimentally determined stability regions identifies Landau-level mixing as the microscopic origin. We attribute the stabilization of these even-denominator states to inversion-symmetry breaking in TLG, which enhances valley-resolved Landau-level hybridization and renormalizes short-range Coulomb interactions. Our results expand the landscape of even-denominator fractional quantum Hall states to multilayer graphene and establish TLG as a tunable platform for realizing non-Abelian anyons.
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