The role of surface fluctuations on the local Bose-Einstein condensate (BEC) in a self-bounded system like He-4 is investigated at T = 0 K. We find that when the wave function (wf) properly includes these fluctuations the local BEC only reaches about 50% and not 100% as found with a standard wf. Further, out of the surface the condensate decreases and correspondingly there is an enhanced population of small momentum states. We find this behaviour both for the liquid-vacuum interface and for clusters larger than about 200 particles. Our results are based on a novel shadow wave function which describes the self-binding of He-4 only via interparticle correlations. (C) 2000 Elsevier Science B.V. All rights reserved.
Surface Bose-Einstein condensate: clusters and free surface of He-4 / D. E. Galli, L. Reatto. - In: PHYSICA. B, CONDENSED MATTER. - ISSN 0921-4526. - 284(2000), pp. 152-153.
Titolo: | Surface Bose-Einstein condensate: clusters and free surface of He-4 |
Autori: | GALLI, DAVIDE EMILIO (Primo) |
Parole Chiave: | Bose-Einstein condensation; He-4; surface fluctuations |
Settore Scientifico Disciplinare: | Settore FIS/03 - Fisica della Materia |
Data di pubblicazione: | 2000 |
Rivista: | |
Tipologia: | Article (author) |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/S0921-4526(99)02210-3 |
Appare nelle tipologie: | 01 - Articolo su periodico |