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Commensurate-incommensurate transition of cold atoms in an optical lattice



Commensurate-incommensurate transition of cold atoms in an optical lattice



Physical Review Letters 90(13): 130401



An atomic gas subject to a commensurate periodic potential generated by an optical lattice undergoes a superfluid-Mott insulator transition. Confining a strongly interacting gas to one dimension generates an instability where an arbitrary weak potential is sufficient to pin the atoms into the Mott state; here, we derive the corresponding phase diagram. The commensurate pinned state may be detected via its finite excitation gap and the Bragg peaks in the static structure factor.

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Accession: 048582630

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PMID: 12689270

DOI: 10.1103/PhysRevLett.90.130401


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