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

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

2010-05-18

arxiv.org/abs/1005.3090v2

Physical Review A 82, 013612 (2010)

Physics

Condensed Matter

Quantum Gases

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

Scientific paper

10.1103/PhysRevA.82.013612

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.

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