Higher Energy Composite Fermion Levels in the Fractional Quantum Hall Effect

Details Higher Energy Composite Fermion Levels in the Fractional Quantum Hall Effect Higher Energy Composite Fermion Levels in the Fractional Quantum Hall Effect

2011-08-19

arxiv.org/abs/1108.3978v1

Phys. Rev. Lett. 106, 096803 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.106.096803

Even though composite fermions in the fractional quantum Hall liquid are well established, it is not yet known up to what energies they remain intact. We probe the high-energy spectrum of the 1/3 liquid directly by resonant inelastic light scattering, and report the observation of a large number of new collective modes. Supported by our theoretical calculations, we associate these with transitions across two or more composite fermions levels. The formation of quasiparticle levels up to high energies is direct evidence for the robustness of topological order in the fractional quantum Hall effect.

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