Commensurate-incommensurate transition of cold atoms in an optical lattice

Details Commensurate-incommensurate transition of cold atoms in an optical lattice Commensurate-incommensurate transition of cold atoms in an optical lattice

2002-08-20

arxiv.org/abs/cond-mat/0208391v1

Phys. Rev. Lett. 90, 130401 (2003)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.90.130401

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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