Instabilities of a matter wave in a matter grating
arXiv:0904.4810 · doi:10.1103/PhysRevA.80.063613
Abstract
We investigate the stability of Bloch waves for a Bose-Einstein condensate moving through a periodic lattice created by another condensate modulated by an optical lattice. We show that the coupling of phonon-antiphonon modes of the two species give rise to a very rich structure of the regimes for dynamical instability, with significant differences with respect to the case of a single condensate in an optical lattice. We characterize the relative weight of each condensate in the mixing and discuss an analytic limit that accounts for the bare structure of the instability diagrams.
arXiv comment4 pages, 4 figures
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- Bose-Einstein Condensates in Spin-Orbit Coupled Optical Lattices: Flat Bands and Superfluidity
- Superfluidity breakdown of Rabi-coupled two-component Bose-Einstein condensates in optical lattices
- Fragmentation, domain formation and atom number fluctuations of a two-species Bose-Einstein condensate in an optical lattice
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- Analytical study on parameter regions of dynamical instability for two-component Bose--Einstein condensates with coaxial quantized vortices