Measurements of the moment of inertia by Kim and Chan have found that solid He4 acts like a supersolid at low temperatures. To understand the order in solid He4, we have used path integral Monte Carlo simulations to calculate the off-diagonal long-range order (ODLRO) [equivalent to Bose-Einstein condensation (BEC)]. We do not find ODLRO in a defect-free hcp crystal of He4 at the melting density. We discuss these results in relation to proposed quantum solid trial functions. We conclude that the solid He4 wave function has correlations which suppress both vacancies and BEC.
ASJC Scopus subject areas
- Physics and Astronomy(all)