Model for Breakdown of Laminar Flow of a Quantum Hall Fluid Around a Charged Impurity: Comparison with Experiment

Details Model for Breakdown of Laminar Flow of a Quantum Hall Fluid Around a Charged Impurity: Comparison with Experiment Model for Breakdown of Laminar Flow of a Quantum Hall Fluid Around a Charged Impurity: Comparison with Experiment

2003-06-10

arxiv.org/abs/cond-mat/0306246v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, submitted for proceedings of EP2DS

Scientific paper

10.1016/j.physe.2003.11.250

In samples used to maintain the US resistance standard the breakdown of the dissipationless integer quantum Hall effect occurs as a series of dissipative voltage steps. A mechanism for this type of breakdown is proposed, based on the generation of magneto-excitons when the quantum Hall fluid flows past an ionised impurity above a critical velocity. The calculated generation rate gives a voltage step height in good agreement with measurements. We also compare this model to a hydrodynamic description of breakdown.

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