2011/01/28 by P. Deuar, P. Ziń, J. Chwedeńczuk +1 · 1 citation
Physics and Astronomy · #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Collision #Focus (optics) #Halo #High-Energy Particle Collisions Research #Mean field theory #Quantum and Classical Electrodynamics #Supersonic speed #cond-mat.quant-gas
paper · pdf · doi:10.1140/epjd/e2011-20066-7
published as Eur. Phys. J. D 65, 19 (2011) · 6 pages, 4 figures
arxiv created 2011/01/28 · openalex publication_date 2011/06/28 · arxiv updated 2012/01/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We consider the collision of two Bose Einstein condensates at supersonic velocities and focus on the halo of scattered atoms. This halo is the most important feature for experiments and is also an excellent testing ground for various theoretical approaches. In particular we find that the typical reduced Bogoliubov description, commonly used, is often not accurate in the region of parameters where experiments are performed. Surprisingly, besides the halo pair creation terms, one should take into account the evolving mean field of the remaining condensate and on-condensate pair creation. We present examples where the difference is clearly seen, and where the reduced description still holds.