Neutral modes edge state dynamics through quantum point contacts

Abstract

Dynamics of neutral modes for fractional quantum Hall states is investigated for a quantum point contact geometry in the weak-backscattering regime. The effective field theory introduced by Fradkin-Lopez for edge states in the Jain sequence is generalized to the case of propagating neutral modes. The dominant tunnelling processes are identified also in the presence of non-universal phenomena induced by interactions. The crossover regime in the backscattering current between tunnelling of single-quasiparticles and of agglomerates of p-quasiparticles is analysed. We demonstrate that higher order cumulants of the backscattering current fluctuations are a unique resource to study quantitatively the competition between different carrier charges. We find that propagating neutral modes are a necessary ingredient in order to explain this crossover phenomena.

28 pages, 5 figures

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• Single quasiparticle and electron nano-emitter in the fractional quantum Hall regime
• Environmental induced renormalization effects in quantum Hall edge states
• Multiple quasiparticle Hall spectroscopy investigated with a resonant detector
• Why a noninteracting model works for shot noise in fractional charge experiments
• Contacts, equilibration, and interactions in fractional quantum Hall edge transport
• Neutral modes edge state dynamics through quantum point contacts
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