Anomalous robustness of the 5/2 fractional quantum Hall state near a sharp phase boundary
Abstract
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 = 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 (EF) 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 suddenly disappears and turns into a metallic state once EF moves to the ground-state LL of the antisymmetric subband. The sharpness of this disappearance suggests a first-order transition.
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