We give a variational Monte Carlo description at T = 0 K of 4He filling a porous glass within the shadow wave function technique. The confining media is modeled by a smooth cylindrical pore, and we have considered two different pore radii: R = 13 Å and R = 22.5 Å. The radial density profiles show a strong layering of the 4He atoms. In the R = 13 Å pore, as the density is increased, solidification takes place layer by layer, starting from the pore wall, and the radius is too small to allow a bulk-like solid to nucleate in the small liquid region at the center of the pore. For the R = 22.5 Å pore we find an hcp lattice accommodated in the central region surrounded by four layers which turn out to be solid at the density of the computation. Computing the one-body density matrix (in the R = 13 Å case) we are able to estimate the Bose-Einstein condensate fraction, which is still non-zero even when the whole system is in the solid phase.
Solid 4He in Narrow Porous Media / M. Rossi, D.E. Galli, L. Reatto (AIP CONFERENCE PROCEEDINGS). - In: Low temperature physics / [a cura di] Y. Takano, S. P. Hershfield, S. O. Hill, P. J. Hirschfeld and A. M. Goldman. - [s.l] : AIP, 2006. - ISBN 0735403473. - pp. 356-357 (( Intervento presentato al 24. convegno International Conference on Low Temperature Physics - LT24 tenutosi a Orlando nel 2005 [10.1063/1.2354734].
Solid 4He in Narrow Porous Media
M. RossiPrimo
;D.E. GalliSecondo
;L. ReattoUltimo
2006
Abstract
We give a variational Monte Carlo description at T = 0 K of 4He filling a porous glass within the shadow wave function technique. The confining media is modeled by a smooth cylindrical pore, and we have considered two different pore radii: R = 13 Å and R = 22.5 Å. The radial density profiles show a strong layering of the 4He atoms. In the R = 13 Å pore, as the density is increased, solidification takes place layer by layer, starting from the pore wall, and the radius is too small to allow a bulk-like solid to nucleate in the small liquid region at the center of the pore. For the R = 22.5 Å pore we find an hcp lattice accommodated in the central region surrounded by four layers which turn out to be solid at the density of the computation. Computing the one-body density matrix (in the R = 13 Å case) we are able to estimate the Bose-Einstein condensate fraction, which is still non-zero even when the whole system is in the solid phase.File | Dimensione | Formato | |
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