Dynamical preparation of an atomic condensate in a Hofstadter band
Dynamical preparation of an atomic condensate in a Hofstadter band
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DOI：
10.1103/physreva.105.043301
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发表时间：
2021-07
影响因子：
2.9
通讯作者：
H. Fu;A. Glatz;F. Setiawan;Kai-Xuan Yao;Zhendong Zhang;C. Chin;K. Levin
中科院分区：
文献类型：
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作者：
H. Fu;A. Glatz;F. Setiawan;Kai-Xuan Yao;Zhendong Zhang;C. Chin;K. Levin
在具有非平凡拓扑特征的量子体系中创建哈密顿量是冷原子界的中心目标，使对量子物质新相的广泛探索成为可能。合成这种哈密顿量的一般方案是基于光学晶格的动态调制，从而产生矢量势。同时，调制可能导致加热和严重的平衡困难。在这里，我们通过演示如何使用实验协议动态实现霍夫施塔特玻色-爱因斯坦凝聚（BEC）来证明这些挑战是可以克服的。通过格罗斯-皮塔耶夫斯基的模拟，我们的研究揭示了一个复杂的、多阶段的进化；这包括一个混乱的中间“加热”阶段，随后自发地重新进入BEC。观察到的行为让人想起宇宙模型中的进化。
The creation of a Hamiltonian in the quantum regime which has non-trivial topological features is a central goal of the cold-atom community, enabling widespread exploration of novel phases of quantum matter. A general scheme to synthesize such Hamiltonians is based on dynamical modulation of optical lattices which thereby generate vector potentials. At the same time the modulation can lead to heating and serious difficulties with equilibration. Here we show that these challenges can be overcome by demonstrating how a Hofstadter Bose-Einstein condensate (BEC) can be dynamically realized, using experimental protocols. From Gross-Pitaevskii simulations our study reveals a complex, multistage evolution; this includes a chaotic intermediate “heating” stage followed by a spontaneous reentrance to the BEC. The observed behavior is reminiscent of evolution in cosmological models.