Detection of Pair-Superfluidity for bosonic mixtures in optical lattices

TL;DR

This paper investigates how to detect pair-superfluidity in bosonic mixtures within optical lattices, emphasizing the role of low filling factors and interaction tuning, using interference and density correlation measurements.

Contribution

It demonstrates a method to identify pair-superfluid phases through interference patterns and density correlations, highlighting the impact of low filling factors and interaction sign changes.

Findings

Pair-superfluidity can be detected via interference patterns.

Density correlations reveal the pair-superfluid phase.

Tuning interspecies interaction from attractive to repulsive enhances detection.

Abstract

We consider a mixture of two bosonic species with tunable interspecies interaction in a periodic potential and discuss the advantages of low filling factors on the detection of the pair-superfluid phase. We show how the emergence of such a phase can be put dramatically into evidence by looking at the interference pictures and density correlations after expansion and by changing the interspecies interaction from attractive to repulsive.