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Abstract: We report an investigation of quantum Hall induced currents by simultaneousmeasurements of their magnetic moment and their effect on the conductance of aquantum point contact QPC. Features in the magnetic moment and QPC resistanceare correlated at Landau-level filling factors nu=1, 2 and 4, whichdemonstrates the common origin of the effects. Temperature and non-linear sweeprate dependences are observed to be similar for the two effects. Furthermore,features in the noise of the induced currents, caused by breakdown of thequantum Hall effect, are observed to have clear correlations between the twomeasurements. In contrast, there is a distinct difference in the way that theinduced currents decay with time when the sweeping field halts at integerfilling factor. We attribute this difference to the fact that, while botheffects are sensitive to the magnitude of the induced current, the QPCresistance is also sensitive to the proximity of the current to the QPCsplit-gate. Although it is clearly demonstrated that induced currents affectthe electrostatics of a QPC, the reverse effect, the QPC influencing theinduced current, was not observed.



Autor: M. J. Smith, C. D. H. Williams, A. Usher, A. S. Sachrajda, A. Kam, Z. R. Wasilewski

Fuente: https://arxiv.org/







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