Negative Delta-T Noise in the Fractional Quantum Hall Effect

Authors :: B. Grémaud
Thibaut Jonckheere
Jérôme Rech
Thomas Martin
Centre de Physique Théorique - UMR 7332 (CPT)
Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)
CPT - E6 Nanophysique
Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)
Source :: Physical Review Letters, Physical Review Letters, American Physical Society, 2020, 125 (8), pp.086801. ⟨10.1103/PhysRevLett.125.086801⟩, Physical Review Letters, 2020, 125 (8), pp.086801. ⟨10.1103/PhysRevLett.125.086801⟩
Publication Year :: 2020
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.<br />Comment: 6+8 pages, 3 figures

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