A Model for the Voltage Steps in the Breakdown of the Integer Quantum Hall Effect

Details A Model for the Voltage Steps in the Breakdown of the Integer Quantum Hall Effect A Model for the Voltage Steps in the Breakdown of the Integer Quantum Hall Effect

2002-01-29

arxiv.org/abs/cond-mat/0201532v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages including 3 figures

Scientific paper

10.1103/PhysRevLett.91.126803

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 on both electron and hole gases. We also compare this model to a hydrodynamic description of breakdown.

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