%0 Journal Article
%T Surface Region of Superfluid Helium as an Inhomogeneous Bose-Condensed Gas
%A A. Griffin
%A S. Stringari
%J Physics
%D 1995
%I arXiv
%R 10.1103/PhysRevLett.76.259
%X We present arguments that the low density surface region of self-bounded superfluid $^4$He systems is an inhomogeneous dilute Bose gas, with almost all of the atoms occupying the same single-particle state at $T = 0$. Numerical evidence for this complete Bose-Einstein condensation was first given by the many-body variational calculations of $^4$He droplets by Lewart, Pandharipande and Pieper in 1988. We show that the low density surface region can be treated rigorously using a generalized Gross-Pitaevskii equation for the Bose order parameter.
%U http://arxiv.org/abs/cond-mat/9511100v1