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Soft Matter and Biological Physics

EPJ B - Superfluidity of a perfect quantum crystal

Only one liquid exhibits Bose-Einstein condensation in nature: Helium II, . At such temperatures, all other substances are solid. In these two papers, Vitaly Golovko demonstrates that Bose-Einstein condensation can also occur in the solid state. Moreover, it is shown that at 0 K, a condensate crystal is energetically preferable with respect to the same quantum crystal without condensate. Therefore, on lowering the temperature of the crystal there must somewhere happen Bose-Einstein condensation, as in liquid helium. This opens a huge field for experimental investigations of Bose-Einstein condensation and of its influence on properties of solids.

F. Croccolo, G. Fragneto and H. Stark
To the editorial team (in charge of final copy editing and production): Thank you for your high quality, speedy work.

Jean-Noël Roux, Université Paris-Est, Laboratoire Navier, IFSTARR, ENPC, CNRS, Champs-sur-Marne, France

ISSN (Print Edition): 1292-8941
ISSN (Electronic Edition): 1292-895X

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