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arXiv · 2001.08962

Negative delta-$T$ noise in the Fractional Quantum Hall effect

J. Rech·T. Jonckheere·B. Grémaud·T. Martin
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Abstract

We study the current correlations of fractional quantum Hall edges at the output of a quantum point contact (QPC) subjected to a temperature gradient. This out-of-equilibrium situation gives rise to a form of temperature-activated shot noise, dubbed delta-$T$ noise. We show that the tunneling of Laughlin quasiparticles leads to a negative delta-$T$ noise, in stark contrast with electron tunneling. Moreover, varying the transmission of the QPC or applying a voltage bias across the Hall bar may flip the sign of this noise contribution, yielding signatures which can be accessed experimentally.

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J. Rech, T. Jonckheere, B. Grémaud, T. Martin. 2020-08-22. Negative delta-$T$ noise in the Fractional Quantum Hall effect. https://doi.org/10.1103/physrevlett.125.086801

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