Analysis of an atom laser based on the spatial control of the scattering   length
  In this paper we analyze atom lasers based on the spatial modulation of the scattering length of a Bose-Einstein Condensate. We demonstrate, through numerical simulations and approximate analytical methods, the controllable emission of matter-wave bursts and study the dependence of the process on the spatial dependence of the scattering length along the axis of emission. We also study the role of an additional modulation of the scattering length in time. 
Alicia V. Carpentier, Humberto Michinel, Mar\'ia I. Rodas-Verde,   V\'ictor M. P\'erez-Garc\'ia