Transition from Free to Interacting Composite Fermions away from $\nu$=1/3

Abstract

Spin excitations from a partially populated composite fermion level are studied above and below $\nu =1/3$. In the range $2/7<\nu <2/5$ the experiments uncover significant departures from the non-interacting composite fermion picture that demonstrate the increasing impact of interactions as quasiparticle Landau levels are filled. The observed onset of a transition from free to interacting composite fermions could be linked to condensation into the higher order states suggested by transport experiments and numerical evaluations performed in the same filling factor range.

arXiv comment4 pages, 5 figures, to appear in PRL

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• The Hierarchy of Incompressible Fractional Quantum Hall States
• Incompressible States of the Interacting Composite Fermions in Negative Effective Magnetic Fields at $\nu =4/13$, 5/17, and 3/10
• Anomalously low magnetoroton energies of the unconventional fractional quantum Hall states of composite fermions
• Splitting of Girvin-MacDonald-Platzman density wave and the nature of chiral gravitons in fractional quantum Hall effect
• Hamiltonian Theory of Disorder at 1/3
• Collective excitations in a magnetically doped quantized Hall ferromagnet
• Dispersion of collective modes in spinful fractional quantum Hall states on the sphere
• Probing fractional quantum Hall effect by photoluminescence