Quasiequilibrium supersolid phase of a two-dimensional dipolar crystal

TL;DR

This study investigates the potential for a supersolid phase in a two-dimensional dipolar crystal at zero temperature, revealing that vacancies induce supersolidity due to repulsive interactions.

Contribution

It demonstrates that vacancies or interstitials can turn a 2D dipolar crystal into a supersolid, highlighting the role of effective interactions between vacancies.

Findings

Commensurate solid is not a supersolid in the thermodynamic limit.

Vacancies or interstitials induce supersolidity.

Effective repulsive interaction between vacancies enables supersolid formation.

Abstract

We have studied the possible existence of a supersolid phase of a two-dimensional dipolar crystal using quantum Monte Carlo methods at zero temperature. Our results show that the commensurate solid is not a supersolid in the thermodynamic limit. The presence of vacancies or interstitials turns the solid into a supersolid phase even when a tiny fraction of them are present in a macroscopic system. The effective interaction between vacancies is repulsive making a quasiequilibrium dipolar supersolid possible.