Van der Waals universality near a quantum tricritical point

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Abstract

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
JournalarXiv
Publication statusPublished - 23 Dec 2019

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