Observation of a metallic superfluid in a numerical experiment

TL;DR

This paper reports the numerical discovery of a metallic superfluid state in Monte Carlo simulations, characterized by unique resistance and dissipation properties, potentially realizable in compressed hydrogen or isotopes.

Contribution

First numerical observation of a metallic superfluid state with distinct quantum properties, expanding the known quantum dissipationless states.

Findings

Identification of a metallic superfluid with ohmic resistance to counter-flows

Dissipationless co-flows of electrons and protons observed

Potential realization in high-pressure hydrogen or isotopes

Abstract

We report the observation, in Monte Carlo simulations, of a novel type of quantum ordered state: {\it the metallic superfluid}. The metallic superfluid features ohmic resistance to counter-flows of protons and electrons, while featuring dissipationless co-flows of electrons and protons. One of the candidates for a physical realization of this remarkable state of matter is hydrogen or its isotopes under high compression. This adds another potential candidate to the presently known quantum dissipationless states, namely superconductors, superfluid liquids and vapours, and supersolids.