Alkali Gases in Optical Lattices: A New Type of Quantum Crystals?

Abstract

Similarities between alkali gases in optical lattices with non-integer occupation of the lattice sites and quantum crystals are explored. The analogy with the vacancy liquid (VL) provides an alternative explanation to the Mott transition for the recent experiment on the phase transition in the lattice. The VL can undergo BEC with T_{c} within experimental reach. Direct and vacancy-assisted mechanisms of the band motion for hyperfine impurities are discussed. Large concentration of vacancies can result in the spatial decomposition of the system into pure hyperfine components. Below the vacancy condensation the impurity component resembles 3He in 3He-HeII mixtures.

arXiv comment4 pages

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• Cold bosonic atoms in optical lattices
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Cited by in corpus (5)

• Cold Bosons in Optical Lattices
• Superfluid-Superfluid Phase Transitions in Two-Component Bose System
• Drag effect and topological complexes in strongly interacting two-component lattice superfluids
• Quasiequilibrium Mixture of Itinerant and Localized Bose Atoms in Optical Lattice
• Bose condensation of interacting gases in traps with and without optical lattice