Dark state cooling of atoms by superfluid immersion

Abstract

We propose and analyse a scheme to cool atoms in an optical lattice to ultra-low temperatures within a Bloch band, and away from commensurate filling. The protocol is inspired by ideas from dark state laser cooling, but replaces electronic states with motional levels, and spontaneous emission of photons by emission of phonons into a Bose-Einstein condensate, in which the lattice is immersed. In our model, achievable temperatures correspond to a small fraction of the Bloch band width, and are much lower than the reservoir temperature.

4 pages, 4 figures, RevTeX 4

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• Dynamics, dephasing and clustering of impurity atoms in Bose-Einstein condensates
• Transport of strong-coupling polarons in optical lattices
• Dissipative dynamics of atomic Hubbard models coupled to a phonon bath: Dark state cooling of atoms within a Bloch band of an optical lattice
• Symmetry breaking in small rotating cloud of trapped ultracold Bose atoms
• Cooling ultracold bosons in optical lattices by spectral transform