Spinful bosons in an optical lattice

Details Spinful bosons in an optical lattice Spinful bosons in an optical lattice

2006-06-10

arxiv.org/abs/cond-mat/0606265v2

Physics

Condensed Matter

Other Condensed Matter

Minor revisions and clarifications

Scientific paper

10.1103/PhysRevA.74.053419

We analyze the behavior of cold spin-1 particles with antiferromagnetic interactions in a one-dimensional optical lattice using density matrix renormalization group calculations. Correlation functions and the dimerization are shown and we also present results for the energy gap between ground state and the spin excited states. We confirm the anticipated phase diagram, with Mott-insulating regions of alternating dimerized S=1 chains for odd particle density versus on-site singlets for even density. We find no evidence for any additional ordered phases in the physically accessible region, however for sufficiently large spin interaction, on-site singlet pairs dominate leading, for odd density, to a breakdown of the Mott insulator or, for even density, a real-space singlet superfluid.

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