Collision physics and collective phenomena with ultra-cold atoms and molecules

I will describe some of our recent results on collision physics and collective phenomena with ultra-cold atoms and molecules. In particular, we have investigated how radio-frequency radiation can induce new or modify existing Feshbach resonances [1], and how ultra-cold polar molecules, such as KRb, can be formed and themselves collide [2]. We have studied collective phenomena of ultra-cold atoms as well. In particular, we have investigated interference patterns generated by atoms suddenly loaded into an optical lattice [3], the effect of rotation on strongly-interacting fermionic atoms [4], and studied the loss of energy in a three-component spinor-condensate [5].\\[4pt] [1] A.M. Kaufman, R.P. Anderson, T.M. Hanna, {\it et al.}, Phys Rev. A {\bf 80}, 050701(2009)\\[0pt] [2] S. Kotochigova, E. Tiesinga, P.S. Julienne, New J. Phys {\bf 11}, 055043 (2009)\\[0pt] [3] P.R. Johnson, E. Tiesinga, J.V. Porto {\it et al.}, New J. Phys {\bf 11}, 093022 (2009)\\[0pt] [4] M. Iskin, E. Tiesinga, Phys Rev. A {\bf 79}, 053621 (2009)\\[0pt] Y. Liu, E. Gomez, S.E. Maxwell, {\it et al.}, Phys Rev. Lett. {\bf 102}, 225301 (2009)