Van der Waals universality near a quantum tricritical point

P. M. A. Mestrom, V. E. Colussi, T. Secker, G. P. Groeneveld, S. J. J. M. F. Kokkelmans

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We study the three-body scattering hypervolume D of atoms whose scattering length a is on the order of or smaller than the typical range rvdW of the van der Waals attraction. We find that the real part of D behaves universally in this weakly interacting regime (|a|/rvdW≲1) in the absence of trimer resonances. This universality originates from hard-sphere-like collisions that dominate elastic three-body scattering. We use this result to make quantitative predictions for the thermodynamics and elementary excitations of an atomic Bose-Einstein condensate (BEC) in the vicinity of a quantum tricritical point, including quantum droplets stabilized by effective three-body interactions
Original languageEnglish
Article number1912.10812v1
Number of pages9
Publication statusPublished - 23 Dec 2019


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