Transverse collisional instabilities of a Bose-Einstein condensate in a driven one-dimensional lattice

Abstract

Motivated by recent experiments, we analyse the stability of a three-dimensional Bose-Einstein condensate (BEC) loaded in a periodically driven one-dimensional optical lattice. Such periodically driven systems do not have a thermodynamic ground state, but may have a long-lived steady state which is an eigenstate of a "Floquet Hamiltonian". We explore collisional instabilities of the Floquet ground state which transfer energy into the transverse modes. We calculate decay rates, finding that the lifetime scales as the inverse square of the scattering length and inverse of the peak three- dimensional density. These rates can be controlled by adding additional transverse potentials.

arXiv comment9 pages, 3 figures

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• Topological Bands for Ultracold Atoms
• Four-Dimensional Quantum Hall Effect with Ultracold Atoms
• Artificial gauge fields in materials and engineered systems
• Observation of Bose-Einstein Condensation in a Strong Synthetic Magnetic Field
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