Phases of dipolar bosons in a bilayer geometry

TL;DR

This paper uses first-principles simulations to map the phase diagram of dipolar bosons in a bilayer, revealing four phases and a direct transition between a dimer crystal and superfluids, with no supersolid phase.

Contribution

It provides the first detailed phase diagram of bilayer dipolar bosons, identifying four distinct phases and a direct quantum phase transition.

Findings

Four distinct phases identified: paired superfluid, decoupled superfluid, dimer crystal, and layered crystal.

A direct quantum phase transition from dimer crystal to two superfluids is observed.

No supersolid phase is predicted in the studied parameter range.

Abstract

We study by first principle computer simulations the low temperature phase diagram of bosonic dipolar gases in a bilayer geometry, as a function of the two control parameters, i.e., the in-plane density and the interlayer distance. We observe four distinct phases, namely paired and decoupled superfluids, as well as a crystal of dimers and one consisting of two aligned crystalline layers. A direct quantum phase transition from a dimer crystal to two independent superfluids is observed in a relatively wide range of parameters. No supersolid phase is predicted for this system.