Two-Body and Three-Body Contacts for Identical Bosons near Unitarity
Artikel i vetenskaplig tidskrift, 2014

In a recent experiment with ultracold trapped Rb-85 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 C-2 and the three-body contact C-3. We determine the contact densities for the unitary Bose gas with number density n to be C-2 approximate to 20n(4/3) and C-3 approximate to 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 C-3, but the loss rate is not compatible with that from 2-atom inelastic collisions, which gives a contribution proportional to C-2. We point out that the contacts C-2 and C-3 could be measured independently by using the virial theorem near and at unitarity, respectively.

CORRELATED FERMI GAS

Författare

D. H. Smith

E. Braaten

D. Kang

Lucas Platter

Chalmers, Fundamental fysik

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 112 11 Article no. 110402-

Ämneskategorier

Fysik

DOI

10.1103/PhysRevLett.112.110402

Mer information

Skapat

2017-10-07