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Author (up) Sepulveda, N.; Josserand, C.; Rica, S. pdf  doi
  Title Superfluid density in a two-dimensional model of supersolid Type
  Year 2010 Publication European Physical Journal B Abbreviated Journal Eur. Phys. J. B  
  Volume 78 Issue 4 Pages 439-447  
  Abstract We study in 2-dimensions the superfluid density of periodically modulated states in the framework of the mean-field Gross-Pitaevskii model of a quantum solid. We obtain a full agreement for the superfluid fraction between a semi-theoretical approach and direct numerical simulations. As in 1-dimension, the superfluid density decreases exponentially with the amplitude of the particle interaction. We discuss the case when defects are present in this modulated structure. In the case of isolated defects (e.g. dislocations) the superfluid density only shows small changes. Finally, we report an increase of the superfluid fraction up to 50% in the case of extended macroscopical defects. We show also that this excess of superfluid fraction depends on the length of the complex network of grain boundaries in the system.  
  Corporate Author Thesis  
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1434-6028 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000286669400004 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 121  
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