Ising Deconfinement Transition Between Feshbach-Resonant Superfluids

TL;DR

This paper studies a one-dimensional bosonic system with Feshbach resonant interactions, revealing an Ising deconfinement transition between different superfluid phases through advanced numerical and theoretical methods.

Contribution

It provides the first detailed evidence of an Ising deconfinement transition in a low-dimensional superfluid system using DMRG and field theory.

Findings

Identification of the Ising transition between superfluids

Extraction of the Ising order parameter and correlation length

Entanglement entropy analysis confirms critical degrees of freedom

Abstract

We investigate the phase diagram of bosons interacting via Feshbach-resonant pairing interactions in a one-dimensional lattice. Using large scale density matrix renormalization group (DMRG) and field theory techniques we explore the atomic and molecular correlations in this low-dimensional setting. We provide compelling evidence for an Ising deconfinement transition occurring between distinct superfluids and extract the Ising order parameter and correlation length of this unusual superfluid transition. This is supported by results for the entanglement entropy which reveal both the location of the transition and critical Ising degrees of freedom on the phase boundary.