Possible non-Abelian Moore-Read state in double-layer bosonic fractional quantum Hall system

TL;DR

This paper presents evidence for a non-Abelian Moore-Read state in a double-layer bosonic fractional quantum Hall system, identified through advanced numerical methods, expanding the understanding of topological phases in bilayer systems.

Contribution

It demonstrates, via numerical simulations, the possible realization of a non-Abelian Moore-Read state in a bilayer bosonic FQH system, which was previously unconfirmed.

Findings

Identification of a non-Abelian Moore-Read phase in the phase diagram.

Observation of a threefold groundstate degeneracy with interlayer tunneling.

Extraction of the modular S-matrix indicating Ising anyon quasiparticles.

Abstract

Identifying and understanding interacting systems that can host non-Abelian topological phases with fractionalized quasiparticles have attracted intense attentions in the past twenty years. Theoretically, it is possible to realize a rich variety of such states by coupling two Abelian fractional quantum Hall (FQH) states together through gapping out part of the low energy degrees of freedom. So far, there are some indications, but no robust example has been established in bilayer systems for realizing the non-Abelian state in the past. Here, we present a phase diagram of a double-layer bosonic FQH system based on the exact diagonalization and density-matrix renormalization group (DMRG) calculations, which demonstrate a potential regime with the emergence of the non-Abelian bosonic Moore-Read state. We start from the Abelian phase with fourfold topological degeneracies on torus geometry when the two layers are weakly coupled. With the increase of interlayer tunneling, we find an intermediate regime with a threefold groundstate degeneracy and a finite fractional drag Hall conductance. We find the different topological sectors in consistent with Moore-Read state by inserting different fluxes in adiabatic DMRG study. We also extract the modular $\mathcal{S}-$ matrix, which supports the emergence of the non-Abelian Ising anyon quasiparticle in this system.