Fractional Quantum Hall Effect and Wigner Crystal of Two-Flux Composite Fermions

Abstract

In two-dimensional electron systems confined to GaAs quantum wells, as a function of either tilting the sample in magnetic field or increasing density, we observe multiple transitions of the fractional quantum Hall states (FQHSs) near filling factors $\nu =3/4$ and 5/4. The data reveal that these are spin-polarization transitions of interacting two-flux composite Fermions, which form their own FQHSs at these fillings. The fact that the reentrant integer quantum Hall effect near $\nu =4/5$ always develops following the transition to full spin polarization of the $\nu =4/5$ FQHS strongly links the reentrant phase to a pinned \emph{ferromagnetic} Wigner crystal of two-flux composite Fermions.

References in corpus (1)

• Spin-Polarization of Composite Fermions and Particle-Hole Symmetry Breaking

Cited by in corpus (3)

• Fractional Quantum Hall Effect at Landau Level Filling nu=4/11
• Phase Diagram of Fractional Quantum Hall Effect of Composite Fermions in Multi-Component Systems
• Interacting composite fermions: Nature of the 4/5, 5/7, 6/7, and 6/17 fractional quantum Hall states