Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.246803
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Funding
- NSF [DMR-1305691, DMR-1157490]
- Gordon and Betty Moore Foundation [GBMF4420]
- Keck Foundation
- NSF MRSEC [DMR-0819860]
- DOE BES [DE-FG02-00-ER45841]
- State of Florida
- DOE
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1305691] Funding Source: National Science Foundation
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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 nu = 4/5 and 5/7. 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 nu = 4/5 always develops following the transition to full spin polarization of the nu = 4/5 fractional quantum Hall state links the reentrant phase to a pinned ferromagnetic Wigner crystal of composite fermions.
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