Title: Cooling dynamics of a single trapped ion via elastic collisions with small-mass atoms,
Abstract: We demonstrated sympathetic cooling of a single ion in a buffer gas of
ultracold atoms with small mass. Efficient collisional cooling was realized by
suppressing collision-induced heating. We attempt to explain the experimental
results with a simple rate equation model and provide a quantitative discussion
of the cooling efficiency per collision. The knowledge we obtained in this work
is an important ingredient for advancing the technique of sympathetic cooling
of ions with neutral atoms.