Transport gap in a nu=1/3 quantum Hall system: a probe for skyrmions

Abstract

The dependence of the activated gap on magnetic field is studied for the fractional filling factor~1/3. By comparing the experimental results with results from exact diagonalization calculations we are able to identify the excitation of a small antiskyrmion in the low-field regime and a cross-over to spinless excitations at higher magnetic fields. The effect of sample quality is studied. On the side of the theory, comparison between different geometries (torus and sphere) and different sizes is carried out. Under inclusion of Landau level mixing and finite thickness, we obtain a good agreement between calculated energies and experimental results.

arXiv commentsubmitted to PRB

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Cited by in corpus (10)

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• Absorption in the fractional quantum Hall regime: trion dichroism and spin polarization
• Spin-texture and magneto-roton excitations at nu=1/3
• Enhancement of the $\nu =5/2$ Fractional Quantum Hall State in a Small In-Plane Magnetic Field
• Fractionally charged skyrmions in fractional quantum Hall effect
• Multi-component fractional quantum Hall states in graphene: SU(4) versus SU(2)
• Energy Gap and Spin Polarization in the 5/2 Fractional Quantum Hall Effect
• Hamiltonian Theory of Disorder at 1/3
• Observation of exchange Coulomb interactions in the quantum Hall state at nu=3