Anomalous charge tunneling in the fractional quantum Hall edge states at filling factor \nu = 5/2

TL;DR

This paper explains anomalous effective charge observations in fractional quantum Hall edge states at filling factor 5/2 by fitting experimental data with the anti-Pfaffian model, highlighting the role of noise-induced renormalizations and a dominant charge e/2 agglomerate.

Contribution

It introduces a model incorporating noise effects to explain charge anomalies and identifies a dominant e/2 charge excitation at low energies.

Findings

Effective charge anomalies explained by the anti-Pfaffian model.

Renormalization of Luttinger parameters due to 1/f noise.

Dominance of e/2 charge agglomerate at low energies.

Abstract

We explain effective charge anomalies recently observed for fractional quantum Hall edge states at $\nu=5/2$ [M. Dolev, Y. Gross, Y. C. Chung, M. Heiblum, V. Umansky, and D. Mahalu, Phys.Rev. B. \textbf{81}, 161303(R) (2010)]. The experimental data of differential conductance and excess noise are fitted, using the anti-Pfaffian model, by properly take into account renormalizations of the Luttinger parameters induced by the coupling of the system with an intrinsic $1/f$ noise. We demonstrate that a peculiar agglomerate excitation with charge $e/2$, double of the expected $e/4$ charge, dominates the transport properties at low energies.