Path integral calculations of exchange in solid 4He

B. Bernu, D. M. Ceperley

Research output: Contribution to journalArticlepeer-review

Abstract

Recently there have been experimental indications that solid 4He might be a supersolid. We discuss the relation of supersolid behavior to ring exchange. The tunnelling frequencies for ring exchanges in quantum solids are calculated using Path Integral Monte Carlo by finding the free energy for making a path that begins with the atoms in one configuration and ends with a permutation of those positions. We find that the exchange frequencies in solid 4He are described by a simple lattice model which does not show supersolid behavior. Thus, the PIMC calculations constrain the mechanism for the supersolid behavior. We also look at the characteristics of very long exchanges needed for macroscopic mass transport.

Original languageEnglish (US)
Pages (from-to)1462-1466
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume66
Issue number8-9
DOIs
StatePublished - Aug 2005

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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