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A: Atomphysik

A 3: Kalte Atome in Fallen

A 3.1: Talk

Monday, March 22, 2004, 14:00–14:15, HS 132

Atomic Scattering on Bose-Einstein Condensates — •Joachim Brand, Ivo Häring, and Jan Michael Rost — Max-Planck-Institut für Physik komplexer Systeme

A relation between the number of bound collective excitations of an atomic Bose-Einstein condensate and the phase shift of elastically scattered atoms is derived. Within the Bogoliubov model of a weakly interacting Bose gas this relation is exact and generalises Levinson’s theorem. Specific features of the Bogoliubov model such as complex-energy modes, continuum bound states, and Fano resonances are discussed and a numerical example is given.