Collapse of the fractional quantum Hall effect in an electron system with large layer thickness
- 3 December 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 65 (23) , 2916-2919
- https://doi.org/10.1103/physrevlett.65.2916
Abstract
We report the first experimental study of the energy gap for the fractional quantum Hall states at Landau-level filling factors ν=1/3 and 2/3 in a variable-width electron system realized in a selectively doped, parabolic, AlGaAs quantum well. We observe a dramatic decrease in the measured energy gaps as the electron-layer thickness increases and the electric-subband separation decreases, which we interpret as the collapse of the correlated fractional states.Keywords
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