Guilleumas, MontserratCentelles Aixalà, MarioBarranco Gómez, ManuelMayol Sánchez, RicardoPi Pericay, Martí2009-10-082009-10-0820051050-2947https://hdl.handle.net/2445/9646We investigate within mean-field theory the influence of a one-dimensional optical lattice and of trapped degenerate fermions on the critical rotational frequency for vortex line creation in a Bose-Einstein condensate. We consider laser intensities of the lattice such that quantum coherence across the condensate is ensured. We find a sizable decrease of the thermodynamic critical frequency for vortex nucleation with increasing applied laser strength and suggest suitable parameters for experimental observation. Since 87Rb-40K mixtures may undergo collapse, we analyze the related question of how the optical lattice affects the mechanical stability of the system.5 p.application/pdfeng(c) The American Physical Society, 2005Constitució de la matèriaIonitzacióExcitació nuclearConstitution of matterIonizationinfo:eu-repo/semantics/article557042info:eu-repo/semantics/openAccess