Domain wall dynamics in a two-component Bose-Mott insulator

Abstract

We model the dynamics of two species of bosonic atoms trapped in an optical lattice within the Mott regime by mapping the system onto a spin model. A field gradient breaks the cloud into two domains. We study how the domain wall evolves under adiabatic and diabatic changes of this gradient. We determine the timescales for adiabaticity, and study how temperature evolves for slow ramps. We show that after large, sudden changes of the field gradient, the system does not equilibrate on typical experimental timescales. We find interesting spin dynamics even when the initial temperature is large compared to the super-exchange energy. We discuss the implication of our results for experiments wishing to use such a two-component system for thermometry, or as part of a cooling scheme.

6 pages, 5 figures Minor typographical errors corrected. Figure labels changed. Added concluding statements

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Cited by in corpus (6)

• Cooling in strongly correlated optical lattices: prospects and challenges
• Spin gradient demagnetization cooling of ultracold atoms
• Techniques to measure quantum criticality in cold atoms
• Thermometry and Refrigeration in a Two-Component Mott Insulator of Ultracold Atoms
• Solvable Model of a Mixture of Bose-Einstein Condensates
• Pomeranchuk effect and spin-gradient cooling of Bose-Bose mixtures in an optical lattice