Superfluidity of 4He nanoclusters in confinement

Abstract

Structure and superfluid response of nanoscale size helium-four clusters enclosed in spherical cavities are studied by computer simulations. The curved surface causes the formation of well-defined concentric shells, thus imparting to the system a very different structure from that of free standing clusters. On a strongly attractive substrate, superfluidity is only observed at low density, in the single layer coating the inner surface of the cavity. If the substrate is very weak (e.g., Li), on the other hand, a superfluid two-shell structure can form, whose physical properties interpolate between two and three dimensions. It is shown how experimental signatures of this physical behavior can be detected through measurements of the momentum distribution.

7 pages, 6 color figures

References in corpus (8)

• Worm Algorithm and Diagrammatic Monte Carlo: A New Approach to Continuous-Space Path Integral Monte Carlo Simulations
• Luttinger Liquid in the Core of Screw Dislocation in Helium-4
• Superfluidity and Quantum Melting of para-Hydrogen clusters
• Structure, superfluidity, and quantum melting of hydrogen clusters
• Helium-4 Luttinger liquids in nanopores
• Local Superfluidity of Parahydrogen Clusters
• Enhanced superfluid response of parahydrogen in nanoscale confinement
• Topological quantum phases of ${}^4$He confined to nanoporous materials

Cited by in corpus (2)

• Path integral Monte Carlo simulation of global and local superfluidity in liquid ${}^4$He reservoirs separated by nanoscale apertures
• Transverse Quantum Superfluids