Monte Carlo study of the superfluid phase of $^4$He

TL;DR

This paper presents advanced Quantum Monte Carlo simulations of the superfluid phase of helium-4, providing updated estimates for its properties based on large-scale computational modeling.

Contribution

It offers the first large-scale QMC study of helium-4 with over 2,000 atoms, improving the accuracy of superfluid property estimates.

Findings

Revised energetic and structural property estimates.

Updated ground state condensate fraction.

Simulation of 2,048 helium atoms, larger than previous studies.

Abstract

Detailed numerical results obtained with state-of-the-art Quantum Monte Carlo (QMC) simulations are presented for the superfluid phase of $^4$He at saturated vapor pressure. The aim of this contribution is that of providing reliable, up-to-date estimates for this archetypal superfluid, reflecting the methodological progress that has taken place over the past two decades. We simulate a system comprising 2,048 helium atoms, i.e., an order of magnitude greater in size than those for which results currently regarded as standard references were originally obtained. We offer revised estimates for energetic and structural properties, as well as for the ground state condensate fraction.