Evidence for non-linear quasiparticle tunneling between fractional quantum Hall edges

TL;DR

This paper reports nonlinear tunneling conductance between fractional quantum Hall edges, revealing temperature-dependent peaks and symmetry behaviors that align with theoretical models of quasiparticle tunneling.

Contribution

It provides experimental evidence for non-linear quasiparticle tunneling between fractional quantum Hall edges in the weak-backscattering regime, supporting theoretical predictions.

Findings

Peak in conductance develops with increasing temperature in ν=1/3 state.

Width of the conductance feature relates to fractional charge.

Symmetric behavior of width around ν=1/2 in 2/3 ≤ ν ≤ 1/3 range.

Abstract

Remarkable nonlinearities in the differential tunneling conductance between fractional quantum Hall edge states at a constriction are observed in the weak-backscattering regime. In the $\nu $ = 1/3 state a peak develops as temperature is increased and its width is determined by the fractional charge. In the range $2/3 \le \nu \le 1/3$ this width displays a symmetric behavior around $\nu $ = 1/2. We discuss the consistency of these results with available theoretical predictions for inter-edge quasiparticle tunneling in the weak-backscattering regime.