Continuous Preparation of a Fractional Chern Insulator

TL;DR

This paper demonstrates a continuous quantum phase transition between a Bose superfluid and a fractional Chern insulator, providing a detailed theoretical framework and implications for quantum state preparation.

Contribution

It introduces a field theoretic description of the transition, accounting for lattice symmetries and predicting a Landau forbidden transition protected by inversion.

Findings

Evidence of a continuous transition between phases

Development of a vortex-based field theory

Implications for quantum state preparation

Abstract

We present evidence of a direct, continuous quantum phase transition between a Bose superfluid and the $\nu=1/2$ fractional Chern insulator in a microscopic lattice model. In the process, we develop a detailed field theoretic description of this transition in terms of the low energy vortex dynamics. The theory explicitly accounts for the structure of lattice symmetries and predicts a Landau forbidden transition that is protected by inversion. That the transition is continuous enables the quasi-adiabatic preparation of the fractional Chern insulator in non-equilibrium, quantum optical systems.