Spin-texture and magneto-roton excitations at nu=1/3

Abstract

Neutral spin texture ST excitations at nu=1/3 are directly observed for the first time by resonant inelastic light scattering. They are determined to involve two simultaneous spin- flips. At low magnetic fields, the ST energy is below that of the magneto-roton minimum. With increasing in-plane magnetic field these modes energies cross at a critical ratio of the Zeeman and Coulomb energies of eta_c=0.020 +- 0.001. Surprisingly, the intensity of the ST mode grows with temperature in the range in which the magneto-roton modes collapse. The temperature dependence is interpreted in terms of a competition between coexisting phases supporting different excitations. We consider the role of the ST excitations in activated transport at nu=1/3.

5 pages, 4 color figs

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• Higher Energy Composite Fermion Levels in the Fractional Quantum Hall Effect
• Gapless Spin Wave Transport through a Quantum Canted-Antiferromagnet
• Fractionally charged skyrmions in fractional quantum Hall effect
• Splitting of Girvin-MacDonald-Platzman density wave and the nature of chiral gravitons in fractional quantum Hall effect
• Baby Skyrmions on the Two-Sphere
• Goldstone Mode Relaxation in a Quantum Hall Ferromagnet due to Hyperfine Interaction with Nuclei
• Spin transition in the fractional quantum Hall regime: Effect of extent of the wave function
• Hamiltonian Theory of Disorder at 1/3
• Review of Rotational Symmetry Breaking in Baby Skyrme Models
• Observation of exchange Coulomb interactions in the quantum Hall state at nu=3
• Dispersion of collective modes in spinful fractional quantum Hall states on the sphere