Nonequilibrium bosonization of fractional quantum Hall edges

Edge transport serves as a powerful probe of remarkable low-energy properties of fractional quantum Hall states, including the anyonic character of their excitations. Here, we develop a theory of fractional quantum Hall edges driven out of equilibrium, which is based on the Keldysh action for the bosonized chiral Luttinger
liquid. With this nonequilibrium FQH bosonization framework, we first consider a single-mode Laughlin edge and analyze the full counting statistics of charge, the quasiparticle Green’s functions, and tunneling transport properties through a quantum point contact, allowing for generic edge excitations. We then extend the formalism to multimode edges with intermode interactions, and explore, with a focus on the ν = 4/3 and ν = 2/3 edges as paradigmatic examples, how interaction-induced fractionalization of anyons modifies the edge dynamics and the associated transport observables. While the full counting statistics probes the fractionalized charge of the excitations, the Green’s functions and tunneling transport are governed by mutual braiding phases of fractionalized excitations and tunneling quasiparticles. We emphasize in particular the effect of interaction-induced
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fractionalization on the Fano factor F and the differential Fano factor Fd , observables that can be measured experimentally. Our formalism, which provides a unified framework for nonequilibrium transport in FQH edges and Luttinger liquids, permits extracting anyonic braiding information from nonequilibrium edge-transport experiments, and paves the way to various extensions, including more involved experimental geometries and edge structures.