Abstract
In two-dimensional electron systems confined to GaAs quantum wells, as a function of either tilting the sample in a magnetic field or increasing density, we observe multiple spin-polarization transitions of the fractional quantum Hall states at filling factors and . The number of observed transitions provides evidence that these are fractional quantum Hall states of interacting two-flux composite fermions. Moreover, the fact that the reentrant integer quantum Hall effect near always develops following the transition to full spin polarization of the fractional quantum Hall state links the reentrant phase to a pinned ferromagnetic Wigner crystal of composite fermions.
- Received 29 July 2014
DOI:https://doi.org/10.1103/PhysRevLett.113.246803
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