Resonant formation of strongly correlated paired states in rotating Bose gases

TL;DR

This paper explores how increasing interatomic interactions in a rotating Bose gas via Feshbach resonance can enhance the fractional quantum Hall gap, leading to a transition from a Laughlin state to a paired state.

Contribution

It extends Chern-Simons theory to include resonance effects, revealing a transition to a paired ground state in rotating Bose gases.

Findings

Ground state evolves from Laughlin to paired wavefunction near resonance

Resonance enhances fractional quantum Hall gap

Pair correlations grow throughout the system

Abstract

We propose increasing the fractional quantum Hall gap of a rapidly rotating Bose gas by increasing the interatomic interactions via a Feshbach resonance. The generation of molecules by the resonance causes pair correlations to grow throughout the system effecting the ground state. By an extension of the usual Chern-Simons theory, built of composite atoms and molecules, we are able to account for these resonance effects. We find that the resulting ground state evolves from a Laughlin wavefunction to a unique paired wavefunction as one approaches the resonance.