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arXiv · 1401.5096

Bath-induced band decay of a Hubbard lattice gas

D. Chen·C. Meldgin·B. DeMarco
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Abstract

Dissipation is introduced to a strongly interacting ultracold bosonic gas in the Mott-insulator regime of a 3D spin-dependent optical lattice. A weakly interacting superfluid comprised of atoms in a state that does not experience the lattice potential acts as a dissipative bath coupled to the lattice atoms via collisions. Lattice atoms are excited to higher-energy bands via Bragg transitions, and the resulting bath-induced decay is measured using the atomic quasimomentum distribution. A competing but slower intrinsic decay mechanism arising from collisions between lattice atoms is also investigated. The measured bath-induced decay rate is compared with the predictions of a weakly interacting model with no free parameters. The presence of intrinsic decay, which cannot be accommodated within this framework, signals that strong interactions may play a central role in the lattice-atom dynamics.

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D. Chen, C. Meldgin, B. DeMarco. 2014-03-10. Bath-induced band decay of a Hubbard lattice gas. https://doi.org/10.1103/physreva.90.013602

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