Luttinger Liquid in the Core of Screw Dislocation in Helium-4

TL;DR

This paper demonstrates through first-principle Monte Carlo simulations that screw dislocations in helium-4 can host superfluid cores exhibiting Luttinger-liquid behavior, marking a novel example of a quasi-one-dimensional supersolid.

Contribution

It provides the first simulation-based evidence of superfluid cores in helium-4 dislocations, revealing a Luttinger-liquid state in a crystalline defect.

Findings

Superfluid core observed in helium-4 dislocations

Dislocation in hydrogen remains insulating

First example of a quasi-1D supersolid in a crystal

Abstract

On the basis of first-principle Monte Carlo simulations we find that the screw dislocation along the hexagonal axis of an hcp He4 crystal features a superfluid core. This is the first example of a regular quasi-one-dimensional supersolid, and one of the cleanest cases of a regular Luttinger-liquid system. In contrast, the same type of screw dislocation in solid Hydrogen is insulating.