We analyze the ground-state properties of an artificial atom made out of
repulsive bosons attracted to a center for the case when all the
interactions are short-ranged. The properties of this artificial
bosonic atom, which can be created by optically trapping ultracold
particles of alkali vapors, can be varied by adjusting both the strength
of "nuclear" attraction and the interparticale repulsion. The dependence
of the ground-state energy of the atom on the number of particles has a
minimum whose position is experimentally tuneable. This implies that the
number of bound bosons has a staircase dependence on external parameters
which may be used to create a single-atomic pipette -- a set-up allowing
the transport of atoms into and out of a reservoir one at a time.
Condensed Matter Seminar
Thursday, February 27, 2003
Physics Building, Room 204
Note special room.
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