Oscillations of Bose condensates in a one-dimensional optical superlattice

Details Oscillations of Bose condensates in a one-dimensional optical superlattice Oscillations of Bose condensates in a one-dimensional optical superlattice

2005-12-30

arxiv.org/abs/cond-mat/0512716v1

PHYSICAL REVIEW A 72, 065601 (2005)

Physics

Condensed Matter

Other Condensed Matter

5 pages,2 figures

Scientific paper

10.1103/PhysRevA.72.065601

Oscillations of atomic Bose-Einstein condensates in a 1D optical lattice with a two-point basis is investigated. In the low-frequency regime, four branches of modes are resolved, that correspond to the transverse in-phase and out-of-phase breathing modes, and the longitudinal acoustic and optical phonon modes of the condensates. Dispersions of these modes depend intimately on the values of two intersite Josephson tunneling strengths, $J_1$ and $J_2$, and the on-site repulsion $U$ between the atoms. Observation of these mode dispersions is thus a direct way to access them.

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