1998
DOI: 10.1103/physrevlett.81.4220
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Current Breakdown of the Fractional Quantum Hall Effect through Contactless Detection of Induced Currents

Abstract: We have observed induced currents associated with the fractional quantum Hall effect (FQHE) in a contactless two-dimensional electron gas subjected to a sweeping magnetic field. Their currentvoltage characteristics exhibit pronounced nonlinearities caused by the breakdown of the FQHE at high currents. Our results support the inter-Landau-level-scattering model of breakdown and provide a new local probe of the FQHE energy gaps at n 1͞3 and 2͞3. They are also consistent with the compositefermion picture but yiel… Show more

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Cited by 33 publications
(25 citation statements)
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“…The magnitude of the induced magnetic moments saturates to some value, M s , at sufficiently fast sweep rates, and this saturation is attributed to the breakdown of the IQHE. 14 Whereas in transport measurements it is I x that is fixed and an increase in xx is indicative of the breakdown of the IQHE, as we shall show below, in our experiments the saturation of the induced magnetic moment is associated with an increase in xx , and hence in a saturation of the induced currents.…”
Section: Resultsmentioning
confidence: 88%
“…The magnitude of the induced magnetic moments saturates to some value, M s , at sufficiently fast sweep rates, and this saturation is attributed to the breakdown of the IQHE. 14 Whereas in transport measurements it is I x that is fixed and an increase in xx is indicative of the breakdown of the IQHE, as we shall show below, in our experiments the saturation of the induced magnetic moment is associated with an increase in xx , and hence in a saturation of the induced currents.…”
Section: Resultsmentioning
confidence: 88%
“…Experimentally, [9,4,5,12,18,8,19,23] the breakdown of the Hall effect at finite driving currents is signaled by the onset of dissipation, and is accompanied by hysteresis and complex dynamical behavior. The critical current and voltage depend, in general, on the geometry of the system, the temperature and on the magnetic field.…”
Section: Introductionmentioning
confidence: 99%
“…7,8 It has been proposed that the nonequilibrium current ͑NEC͒ signals are closely related to the nondissipative current transport which is characteristic to the QHE and the fractional QHE. 8,9 In this picture their magnitude is limited by the critical current I c or critical current density at which the nondissipative transport in the QHE breaks down. 10 It is known that current contacts as well as voltage probes have strong impact on the dissipation in the quantum Hall systems ͑see, for example, Refs.…”
mentioning
confidence: 99%