Bose-Einstein droplet in free space
Bose-Einstein droplet in free space
A ``gaseous droplet''---a stable gas that coheres by itself in free space---is shown to be produced with a Bose-Einstein condensate. Collapse and expansion of the droplet are suppressed by rapid oscillations of the interatomic interaction between attractive and repulsive through, e.g., the Feshbach resonance. Energy dissipation, which is present in …