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arXiv · 0809.0810

Interference effects in transport across a single incompressible strip at the edge of the fractional quantum Hall system

E. V. Deviatov·B. Marquardt·A. Lorke·G. Biasiol·L. Sorba
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Abstract

We experimentally investigate interference effects in transport across a single incompressible strip at the edge of the quantum Hall system by using a Fabry-Perot type interferometer. We find the interference oscillations in transport across the incompressible strips with local filling factors $ν_c=1, 4/3, 2/3$ even at high imbalances, exceeding the spectral gaps. In contrast, there is no sign of the interference in transport across the principal Laughlin $ν_c=1/3$ incompressible strip. This indicates, that even at fractional $ν_c$, the interference effects are caused by "normal" electrons. The oscillation's period is determined by the effective interferometer area, which is sensitive to the filling factors because of screening effects.

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E. V. Deviatov, B. Marquardt, A. Lorke, G. Biasiol, L. Sorba. 2009-02-18. Interference effects in transport across a single incompressible strip at the edge of the fractional quantum Hall system. https://doi.org/10.1103/physrevb.79.125312

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