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arXiv 1004.3333cond-mat.quant-gas
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弱无序和二维光晶格中囚禁玻色-爱因斯坦凝聚体的集体激发

Collective excitations of a trapped Bose-Einstein condensate in the presence of weak disorder and a two-dimensional optical lattice

Ying Hu, Zhaoxin Liang, Bambi Hu

摘要:

研究了零温下弱无序和二维光晶格对简谐囚禁的玻色-爱因斯坦凝聚体(BEC)集体激发的联合作用。相应地,我们推广了二维光晶格中弱相互作用玻色气体的超流流体动力学方程,使其包含了弱无序的影响。我们的分析结果的集体频率超出平均场近似揭示了特殊的作用,相互作用的二维光晶格和原子间的相互作用,沿3D到1D的交叉元激发的无序。特别是,对声子传播和表面模式的无序的后果进行了详细分析。并提出了实验方案。

英文摘要:

We investigate the combined effects of weak disorder and a two-dimensional (2D) optical lattice on the collective excitations of a harmonically trapped Bose-Einstein condensate (BEC) at zero temperature. Accordingly, we generalize the hydrodynamic equations of superfluid for a weakly interacting Bose gas in a 2D optical lattice to include the effects of weak disorder. Our analytical results for the collective frequencies beyond the mean-field approximation reveal the peculiar role of disorder, interplaying with the 2D optical lattice and interatomic interaction, on elementary excitations along the 3D to 1D dimensional crossover. In particular, consequences of disorder on the phonon propagation and surface modes are analyzed in detail. The experimental scenario is also proposed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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