Bath-induced band decay of a Hubbard lattice gas

D. Chen, C. Meldgin, B. Demarco

Research output: Contribution to journalArticlepeer-review


Dissipation is introduced to a strongly interacting ultracold bosonic gas in the Mott-insulator regime of a three-dimensional 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 a higher-energy band 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.

Original languageEnglish (US)
Article number013602
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
StatePublished - Jul 2 2014

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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