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. [10.1016/S0921-4526(99)02210-3]
Surface Bose-Einstein condensate: clusters and free surface of He-4
D.E. GalliPrimo
;L. Reatto
2000
Abstract
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.
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