Superfluidity in a Doped Helium Droplet

TL;DR

This study uses Path Integral Monte Carlo simulations to analyze how doping helium droplets with linear impurities affects superfluidity, revealing a reduced superfluid response in the first solvation layer with temperature behavior akin to 2D helium.

Contribution

It introduces a local estimator for superfluid density in doped helium droplets and characterizes the superfluid response in the first solvation layer.

Findings

Decreased superfluid response in the first solvation layer.

Superfluid response exhibits temperature dependence similar to 2D helium.

Provides a new local estimator for superfluid density distribution.

Abstract

Path Integral Monte Carlo calculations of the superfluid density throughout ^4He droplets doped with linear impurities (HCN)_n are presented. After deriving a local estimator for the superfluid density distribution, we find a decreased superfluid response in the first solvation layer. This effective normal fluid exhibits temperature dependence similar to that of a two-dimensional helium system.