Fractional quantum anomalous Hall phase for Raman superarray of Rydberg atoms

TL;DR

This paper proposes a new Rydberg atom array model to realize and probe the bosonic fractional quantum anomalous Hall phase using Raman-assisted couplings and a novel quench protocol for detecting fractionalized excitations.

Contribution

It introduces a stripe-lattice Rydberg atom model with Raman superarray to realize a topological flat band and fractional quantum anomalous Hall phase, along with a quench protocol for probing fractional excitations.

Findings

Realization of a topological flat band with large bulk gap.

Feasible experimental conditions for bosonic FQAH phase.

A novel quench protocol to detect fractionalized excitations.

Abstract

Rydberg atom arrays offer promising platforms for quantum simulation of correlated quantum matter and raise great interests. This work proposes a novel stripe-lattice model with Raman superarray of Rydberg atoms to realize bosonic fractional quantum anomalous Hall (FQAH) phase. Two types of Rydberg states, arranged in a supperarray configuration and with Raman-assisted dipole-exchange couplings, are implemented to realize a minimal QAH model for hard-core bosons populated into a topological flat band with large bulk gap under proper tunable experimental condition. With this the bosonic FQAH phase can be further achieved and probed feasibly. In particular, a novel quench protocol is proposed to probe the fractionalized excitations by measuring the correlated quench dynamics featured by fractional charge tunneling between bulk and chiral edge modes in the open boundary.