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Breakdown of the integer and fractional quantum Hall states in a quantum point contact

Author(s)
Dillard, Colin R.; Lin, Xi; Kastner, Marc A.; Pfeiffer, L. N.; West, K. W.
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Abstract
The integer and fractional quantum Hall states are known to breakdown at high dc bias, exhibiting deviation from the ideal incompressible behavior. We measure breakdown of the ν=2, 3, 4, 5 integer and the ν=4/3 and 5/3 fractional states in a quantum point contact (QPC) of lithographic width ∼600 nm. Dependence of the critical current on magnetic field, QPC gate voltage, and QPC width are presented. Of particular interest, the critical current of the 4/3 and 5/3 fractional states shows the opposite dependence on QPC width compared to the integer states. This previously unobserved result is not explained by current theories of breakdown.
Date issued
2012-07
URI
http://hdl.handle.net/1721.1/103957
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physica E: Low-dimensional Systems and Nanostructures
Publisher
Elsevier
Citation
Dillard, C., X. Lin, M.A. Kastner, L.N. Pfeiffer, and K.W. West. “Breakdown of the Integer and Fractional Quantum Hall States in a Quantum Point Contact.” Physica E: Low-Dimensional Systems and Nanostructures 47 (January 2013): 290–296.
Version: Author's final manuscript
ISSN
13869477

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