Yujun Wang, Jia Wang, J. P. D'Incao, Chris H. Greene
A three-body parameter (3BP) defines the energy spectrum of three particles when the Efimov effect arises. Until recently, it had been widely agreed that this parameter should not be universal. Our present study further predicts a universal 3BP for heteronuclear atomic systems near broad Feshbach resonances. In particular, we show for a system of one light and two heavy atoms a universal 3BP is expected even without an effective three-body short-range repulsion. This universality is explained by the universal properties of the van der Waals interactions in a simple Born-Oppenheimer (BO) picture. Finally, we show the numerically determined 3BPs for some combination of alkali atoms used in ultracold experiments.
View original:
http://arxiv.org/abs/1207.6439
No comments:
Post a Comment