Cheng, Yongshan [UNESP]Adhikari, Sadhan Kumar [UNESP]2013-09-302014-05-202013-09-302014-05-202010-07-26Physical Review A. College Pk: Amer Physical Soc, v. 82, n. 1, p. 7, 2010.1050-2947http://hdl.handle.net/11449/24530By numerical and variational solutions of the Gross-Pitaevskii equation, we studied the localization of a noninteracting and weakly interacting Bose-Einstein condensate (BEC) in a disordered cold atom lattice and a speckle potential. In the case of a single BEC fragment, the variational analysis produced good results. For a weakly disordered potential, the localized BEC's are found to have an exponential tail as in the weak Anderson localization. We also investigated the expansion of a noninteracting BEC in these potentials. We find that the BEC will be locked in an appropriate localized state after an initial expansion and will execute breathing oscillation around a mean shape when a BEC at equilibrium in a harmonic trap is suddenly released into a disorder potential.7engArtigo10.1103/PhysRevA.82.013631WOS:000280292700014Acesso abertoWOS000280292700014.pdf8031087349809439