M. Bruderer et al 2008 EPL 82 30004 doi:10.1209/0295-5075/82/30004
Self-trapping of impurities in Bose-Einstein condensates: Strong attractive and repulsive coupling
M. Bruderer1, W. Bao2 and D. Jaksch1
Show affiliationsWe study the interaction-induced localization —the so-called self-trapping— of a neutral impurity atom immersed in a homogeneous Bose-Einstein condensate (BEC). Based on a Hartree description of the BEC we show that —unlike repulsive impurities— attractive impurities have a singular ground state in 3d and shrink to a point-like state in 2d as the coupling approaches a critical value β
. Moreover, we find that the density of the BEC increases markedly in the vicinity of attractive impurities in 1d and 2d, which strongly enhances inelastic collisions between atoms in the BEC. These collisions result in a loss of BEC atoms and possibly of the localized impurity itself.
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Issue 3 (May 2008)
Received 25 January 2008, accepted for publication 9 March 2008
Published 16 April 2008
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Self-trapping of impurities in Bose-Einstein condensates: Strong attractive and repulsive coupling
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