Quantum expulsion of impurities from a Bose condensate
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abstract
When a hard-sphere-like impurity is placed in a confined Bose condensate, because it forces a hole in the inhomogeneous condensate wave function, it will be expelled. In contrast to the classical case, Bose condensed atoms can collectively expel massive impurities at T = 0 with essentially no individual collision with the impurity. We estimate that C60 molecules falling through a condensate of atomic hydrogen will be deflected with a radial acceleration comparable to g. At the extremely low density of current hydrogen condensates, only one out of two hundred C60 will likely encounter a single hydrogen atom during its fall.
