title: Ring exchanges and the supersolid phase of 4He.
abstract: Using path integral Monte Carlo simulations we calculate exchange frequencies in bulk hcp 4He as atoms undergo ring exchange. We fit the frequencies to a lattice model and examine whether such atoms could become a supersolid, that is, have a nonclassical rotational inertia. We find that the scaling with respect to the number of exchanging atoms is such that superfluid behavior will not be observed in a perfect 4He crystal.
authors.affiliation: Department of Physics and NCSA, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. ceperley@uiuc.edu
authors.forename: D M
authors.initials: DM
authors.lastname: Ceperley
authors.forename: B
authors.initials: B
authors.lastname: Bernu