Tunneling current noise in the fractional quantum Hall effect: when the effective charge is not what it appears to be

Abstract

Fractional quantum Hall quasiparticles are famous for having fractional electric charge. Recent experiments report that the quasiparticles' effective electric charge determined through tunneling current noise measurements can depend on the system parameters such as temperature or bias voltage. Several works proposed to understand this as a signature for edge theory properties changing with energy scale. I consider two of such experiments and show that in one of them the apparent dependence of the electric charge on a system parameter is likely to be an artefact of experimental data analysis. Conversely, in the second experiment the dependence cannot be explained in such a way.

10 pages, 6 figures

References in corpus (9)

• Non-Abelian Anyons and Topological Quantum Computation
• Observation of neutral modes in the fractional quantum Hall regime
• Edge reconstruction in the $\nu =2/3$ fractional quantum Hall state
• Charge tunneling in fractional edge channels
• Relevance of multiple-quasiparticle tunneling between edge states at ν=p/(2np+1)
• Environmental induced renormalization effects in quantum Hall edge states
• Non-equilibrium noise in transport across a tunneling contact between $\nu =2/3$ fractional quantum Hall edges
• Scaling dimension of quantum Hall quasiparticles from tunneling current noise measurements
• Effect of interactions on the noise of chiral Luttinger liquid systems

Cited by in corpus (1)

• Extracting the scaling dimension of quantum Hall quasiparticles from current correlations