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

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

2003-05-22

arxiv.org/abs/cond-mat/0305539v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages

Scientific paper

10.1103/PhysRevA.68.051602

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.

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