Shot noise as a diagnostic in the $\nu =2/3$ fractional quantum Hall edge zoo

Abstract

The $\nu =2/3$ filling is the simplest paradigmatic example of a fractional quantum Hall state, which contains counter-propagating edge modes. These modes can be either in the unequilibrated regime or equilibrated to different extents, on top of a possible edge reconstruction. In the unequilibrated regime, two distinct renormalization group fixed points have been previously proposed, namely Kane-Fischer-Polchinski and Wang-Meir-Gefen. In the equilibration regime, different degree of thermal equilibration may occur, while charge is fully equilibrated. Here, we show that this rich variety of models can give rise to three possible conductance plateaus at $e^2/2h$ (recently observed in experiments), $5e^2/9h$ (predicted here), and $e^2/3h$ (observed earlier in experiments) in a quantum point contact geometry. We identify different mechanisms for \emph{electrical shot noise} generation at these plateaus, which provides an experimentally accessible venue for distinguishing among the distinct models.

10 pages, 6 figures. Submitted to the special issue of Low Temperature Physics, dedicated to the memory of Sergei Gredeskul. This article comprises an extension of our recent work arXiv:2307.05173 (2023)

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Cited by in corpus (10)

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• Landscapes of an out-of-equilibrium anyonic sea
• Experimentally Motivated Order of Length Scales Affect Shot Noise
• $\Delta T$-noise in Multiterminal Hybrid Systems
• Photo-assisted shot noise probes multiple charge carriers in quantum Hall edges
• Collapse of edge reconstruction in compressible Quantum Hall fluid within filling fraction range 2/3 to 1
• Elevated Hall Responses as Indicators of Edge Reconstruction
• Quantized Transport of $\nu =2/3$ Fractional Quantum Hall Edge with Disordered Superconducting Proximity
• Shot noise signatures of candidate states for the fractional quantum Hall $\nu =12/5$ state