Data di Pubblicazione:
2007
Citazione:
Pressurized 4He in cylindrical and in hexagonal pores / M. Rossi, D. E. Galli, L. Reatto. - In: JOURNAL OF LOW TEMPERATURE PHYSICS. - ISSN 0022-2291. - 146:1-2(2007), pp. 95-114.
Abstract:
We give a variational Monte Carlo description at T = 0 K of 4He filling under pressure a porous glass within the shadow wave function technique. We have considered as confining media two different smooth pores, one with a circular cross-section of radius R = 13 Å resembling a Gelsil pore, and the other with a hexagonal cross–section of side S = 14 Å resembling a FSM-16 pore. In all the studied cases the density profiles show a strong layering of the 4He atoms. As the density is increased, solidification takes place layer by layer, starting from the pore wall. Computing the one-body density matrix 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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Bose-Einstein condensation ; shadow ; wave-function ; porous vycor glass ; ground-state ; quantum-theory ; solid HE-4 ; helium ; superfluidity ; adsorption ; simulation
Elenco autori:
M. Rossi, D. E. Galli, L. Reatto
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