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APS » Journals » Phys. Rev. Lett. » Volume 93 » Issue 15
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Phys. Rev. Lett. 93, 155303 (2004) [4 pages]

Ring Exchanges and the Supersolid Phase of 4He

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D. M. Ceperley*
Department of Physics and NCSA, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA

B. Bernu
Laboratoire de Physique Théorique des Liquides, UMR 7600 of CNRS, Université P. et M. Curie, boite 121, 4 Place Jussieu, 75252 Paris, France

Received 15 September 2004; published 7 October 2004

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.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.155303
DOI:
10.1103/PhysRevLett.93.155303
PACS:
67.80.–s, 02.70.Ss, 05.30.Jp

*Electronic address: ceperley@uiuc.edu

 
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