Phase-shift instanton approach to tunneling duality in Read--Rezayi state

TL;DR

This paper introduces a phase-shift instanton method to analyze tunneling duality in non-Abelian fractional quantum Hall states, providing explicit dual descriptions and revealing universal conductance scaling laws.

Contribution

It develops a novel phase-shift instanton framework to treat non-Abelian edge operators and reformulates the Moore--Read duality for the Read-Rezayi state.

Findings

Reformulation of Moore--Read duality using phase-shift instantons.

Explicit dual description for the $k=3$ Read-Rezayi state.

Universal $G \,\propto \, V^4$ conductance scaling in strong coupling.

Abstract

We study the duality between quasi-particle and electron tunneling in point-contact geometries of fractional quantum Hall states. To treat non-Abelian edge operators, we introduce a "phase-shift instanton" that incorporates phase factors from primary fields into the instanton gas framework. Using this method, we reformulate the Moore--Read duality and obtain an explicit dual description for the $k=3$ Read-Rezayi state. Our results clarify how quasi-particle tunneling produces characteristic phase shifts in instantons and how these shifts map strong quasi-particle tunneling to weak electron tunneling. Based on this dual description, we analytically evaluate the non-linear differential conductance in the strong-coupling regime. We reveal that, due to the physical requirement that the tunneling particle across the vacuum gap must be a true fermion, the transport behavior universally converges to a $G \propto V^4$ scaling for both the Moore--Read and Read--Rezayi states. This universal transport signature highlights a fundamental topological constraint underlying non-Abelian fractional quantum Hall edges.