Creating a supersolid in one-dimensional Bose mixtures

TL;DR

This paper demonstrates the theoretical possibility of creating a one-dimensional supersolid phase in ultra-cold Bose mixtures, characterized by coexisting superfluid and density wave orders, supported by numerical and analytical methods.

Contribution

It identifies conditions for realizing a 1D supersolid in Bose mixtures, combining Luttinger liquid theory with numerical simulations to predict observable experimental signatures.

Findings

Supersolid phase characterized by coexisting orders identified

Conditions for experimental realization in ultra-cold atom systems established

Distinct signatures in interference patterns and structure factor predicted

Abstract

We identify a one-dimensional supersolid phase in a binary mixture of near-hardcore bosons with weak, local inter-species repulsion. We find realistic conditions under which such a phase, defined here as the coexistence of quasi-superfluidity and quasi-charge density wave order, can be produced and observed in finite ultra-cold atom systems in a harmonic trap. Our analysis is based on Luttinger liquid theory supported with numerical calculations using the time-evolving block decimation method. Clear experimental signatures of these two orders can be found, respectively, in time-of-flight interference patterns, and the structure factor S(k) derived from density correlations.