Two-body and three-body contacts for identical Bosons near unitarity.

نویسندگان

  • D Hudson Smith
  • Eric Braaten
  • Daekyoung Kang
  • Lucas Platter
چکیده

In a recent experiment with ultracold trapped Rb85 atoms, Makotyn et al. studied a quantum-degenerate Bose gas in the unitary limit where its scattering length is infinitely large. We show that the observed momentum distributions are compatible with a universal relation that expresses the high-momentum tail in terms of the two-body contact C2 and the three-body contact C3. We determine the contact densities for the unitary Bose gas with number density n to be C2 ≈ 20 n(4/3) and C3 ≈ 2n(5/3). We also show that the observed atom loss rate is compatible with that from 3-atom inelastic collisions, which gives a contribution proportional to C3, but the loss rate is not compatible with that from 2-atom inelastic collisions, which gives a contribution proportional to C2. We point out that the contacts C2 and C3 could be measured independently by using the virial theorem near and at unitarity, respectively.

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عنوان ژورنال:
  • Physical review letters

دوره 112 11  شماره 

صفحات  -

تاریخ انتشار 2014