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Anomalous Robustness of theν=5/2Fractional Quantum Hall State near a Sharp Phase Boundary
2011
Physical Review Letters
We report magneto-transport measurements in wide GaAs quantum wells with tunable density to probe the stability of the fractional quantum Hall effect at filling factor ν = 5/2 in the vicinity of the crossing between Landau levels (LLs) belonging to the different (symmetric and antisymmetric) electric subbands. When the Fermi energy (E_F) lies in the excited-state LL of the symmetric subband, the 5/2 quantum Hall state is surprisingly stable and gets even stronger near this crossing, and then
doi:10.1103/physrevlett.107.176805
pmid:22107557
fatcat:3hmm6hldnrbzrffgubp2vukbca