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arXiv 1507.01402cond-mat.quant-gas
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有效磁场作用下的玻色-哈伯德阶梯:谐波阱中的失超动力学

Bose-Hubbard ladder subject to effective magnetic field: quench dynamics in a harmonic trap

Wladimir Tschischik, Roderich Moessner, Masudul Haque

摘要:

受最近利用光晶格的实验的启发,该实验已经实现了具有有效磁场的梯形几何形状(Atala等人,Nature Physics \textbf{10},588(2014)),我们研究了具有复杂跳跃幅度的紧束缚双腿梯子上的玻色子的动力学。即使没有相互作用,该系统也显示出量子相变。我们研究的非平衡动力学没有和有相互作用,在存在的谐波捕获势。特别是,我们考虑的动力学引起的猝灭的捕获潜力和大小的横档跳跃。我们提出了一个惊人的“慢下来”效应的集体模式动力学附近的相变。这种在量子相变附近的减速现象的表现可以非常直接地可视化:通过对原子云进行成像,可以在实验上实时和真实空间地跟踪集体模式动力学。

英文摘要:

Motivated by a recent experiment with optical lattices that has realized a ladder geometry with an effective magnetic field (Atala et al., Nature Physics \textbf{10}, 588 (2014)), we study the dynamics of bosons on a tight-binding two-leg ladder with complex hopping amplitudes. This system displays a quantum phase transition even without interactions. We study the non-equilibrium dynamics without and with interactions, in the presence of a harmonic trapping potential. In particular we consider dynamics induced by quenches of the trapping potential and of the magnitude of the rung hopping. We present a striking "slowing down" effect in the collective mode dynamics near the phase transition. This manifestation of a slowing down phenomenon near a quantum phase transition can be visualized unusually directly: the collective mode dynamics can be followed experimentally in real time and real space by imaging the atomic cloud.

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