Commensurate-incommensurate transition of cold atoms in an optical lattice |
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Authors: | Büchler H P Blatter G Zwerger W |
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Affiliation: | Theoretische Physik, ETH-H?nggerberg, CH-8093 Zürich, Switzerland. |
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Abstract: | 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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