A new state of matter of quantum droplets
S ince the realization of Bose-Einstein condensation(BEC) [1-3] and degenerate Fermi gases [4],ultra-cold quantum gases have become important plat-forms to study quantum phenomena and novel states of matter with precise control over both internal and exter-nal degrees of freedom.While quantum gases are typi-cally dilute and weakly interacting,the interactions in-trinsically determine their essential properties,such as the superfluidity of a BEC.Most of the realized ultra-cold quantum gases,like the ones consisting of alkali atoms,are dominated by the short-range and isotropic contact interaction that can be tuned from repulsive to attractive via the so-called Feshbach resonances [5].A BEC with effectively attractive interactions at the mean-field level was predicted to be unstable and undergo col-lapse after exceeding a critical atom number,which has been experimentally observed in purely contact interact-ing clouds [6,7] and dipolar quantum gases of Chromium with additional long-range and anisotropic dipolar inter-action [8].
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2021-11-08（万方平台首次上网日期，不代表论文的发表时间）
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