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Contactless detection of current breakdown of the quantum Hall effect

Jones, C L, Usher, A, Elliott, M, Herrenden-Harker, W G, Potts, A, Shepherd, R, Cheng, T S and Foxon, C T (1996) Contactless detection of current breakdown of the quantum Hall effect Solid State Communications, 97, (9), pp. 763-768.

Record type: Article


Contactless measurements have been made, using a torque magnetometer, of the size and decay times of the eddy currents induced in a high mobility two-dimensional electron system, as the magnetic field is swept through the magnetoresistance minima associated with the quantum Hall effect. The currents show a highly non-linear dependence on the sweep rate, suggestive of the breakdown of nearly-dissipationless curent flow. Comparison of the critical current at which breakdown occurs in our experiments with previously reported values indicates that the majority of the current flows close to the edge of our sample. The observation of a rapid initial decay followed by a much slower one (of the order of hours at the lowest temperatures) upon stopping the field sweep is further evidence that the quantum Hall effect is initially destroyed by the large current; after a short time the current density drops below the critical value and the nearly-dissipationless state returns.

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Published date: March 1996
Organisations: Nanoelectronics and Nanotechnology


Local EPrints ID: 252891
PURE UUID: d836553b-81bf-4839-b36b-5e3f9b9efc8a

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Date deposited: 30 Mar 2000
Last modified: 18 Jul 2017 10:01

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Author: C L Jones
Author: A Usher
Author: M Elliott
Author: W G Herrenden-Harker
Author: A Potts
Author: R Shepherd
Author: T S Cheng
Author: C T Foxon

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