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Efimov physics beyond universality | | Richard Schmidt
; Steffen Patrick Rath
; Wilhelm Zwerger
; | | Date: |
20 Jan 2012 | | Abstract: | We calculate the spectrum of three-body Efimov bound states in the context of
ultracold gases, where the two-body scattering length a is tuned via a Feshbach
resonance. It is shown that the finite range in the Feshbach coupling makes the
introduction of an adjustable three-body parameter obsolete. Depending on
whether the resonance is open or closed channel dominated, the length which
sets the scale in the energy level diagram as a function of 1/a is either the
van der Waals length l_vdw or the intrinsic length r* associated with the
Feshbach coupling, with a continuous crossover in between. Our results explain
a number of experimental observations on Efimov states, in particular the
apparent ’universality’ of the ratio between the scattering length where the
first Efimov state appears and the van der Waals length. | | Source: | arXiv, 1201.4310 | | Services: | Forum | Review | PDF | Favorites | |
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