Theory of Small Para-Hydrogen Clusters: Magic Numbers and Superfluid Sizes

ORAL

Abstract

We apply the Path Integral Monte Carlo method to study the low temperature structures and superfluidity of para\-hydrogen clusters with up to 40 molecules. We find an enhanced stability at certain `` magic '' cluster sizes and sharp jumps in superfluidity for specific cluster sizes ($N>26$). Superfluidity is largely localized on the surface and coexists with clusters with solid- like core.

*US DOE (DEFG02-91ER45439), NSF (DMR-03 25939 ITR) and NASA (NAG-8-1760).

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Authors

  • Saad Khairallah

    • Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA

  • Mikhail Sevryuk

    • Institute of Energy Problems of Chemical Physics RAS, Moscow 119334, Russia

  • David Ceperley

    • NCSA and Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA

  • Peter Toennies

    • Max-Planck-Institut fur Dynamik und Selbstorganisation, D-37073 Gottingen, Germany