Tuesday, April 30, 2013

1304.7704 (A. A. Blinova et al.)

Single impurities in a Bose-Einstein condensate can make two polaron

A. A. Blinova, M. G. Boshier, Eddy Timmermans
Polarons, self-localized composite objects formed by the interaction of a single impurity particle with a host medium, are a paradigm of strong interaction many-body physics. We show that dilute gas Bose-Einstein condensates (BEC's) are the first medium known to self-localize the same impurity particles both in a Landau-Pekar polaron state akin to that of self-localized electrons in a dielectric lattice, and in a bubble state akin to that of electron bubbles in helium. We also show that the BEC-impurity system is fully characterized by just two dimensionless coupling constants, and that it can be adiabatically steered from the Landau-Pekar regime to the bubble regime in a smooth crossover trajectory.
View original: http://arxiv.org/abs/1304.7704

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