Bose Gases Near Resonance: renormalized interactions in a condensate
Abstract
We study the interplay between few- and many-body physics in Bose gases near resonance. The effect of condensates on the two-body running coupling constant is investigated via imposing a boundary condition on a self-consistent renormalization flow equation. Bose gases are found to become nearly fermionized when the chemical potential as a function of scattering lengths reaches a maximum and the atomic condensates lose meta-stability. The maximum and accompanied insta- bility are illustrated as a precursor of the sign change of g_2, the renormalized two-body interaction between condensed atoms from effectively repulsive to effectively attractive when approaching res- onance even though the scattering length is still positive. This occurs when dimers, under the influence of condensates, emerge at zero energy in the atomic gases at a finite positive scattering length.
Keywords
Cite
@article{arxiv.1205.2380,
title = {Bose Gases Near Resonance: renormalized interactions in a condensate},
author = {Fei Zhou and Mohammad S. Mashayekhi},
journal= {arXiv preprint arXiv:1205.2380},
year = {2013}
}
Comments
14 pages, 5 figures, submitted version, Typos corrected