Bose-Einstein Condensate on a Synthetic Topological Hall Cylinder
Bose-Einstein Condensate on a Synthetic Topological Hall Cylinder
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DOI：
10.1103/prxquantum.3.010316
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发表时间：
2018-09
期刊：
影响因子：
9.7
通讯作者：
Chuan-Hsun Li;Yangqian Yan;Shih-Wen Feng;S. Choudhury;D. Blasing;Qi Zhou;Yong P. Chen
中科院分区：
文献类型：
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作者：
Chuan-Hsun Li;Yangqian Yan;Shih-Wen Feng;S. Choudhury;D. Blasing;Qi Zhou;Yong P. Chen
在具有非平凡几何的物理空间中，物质粒子和规范场之间的相互作用可以导致新的拓扑量子物质。然而，详细的微观机制往往是模糊的，非常规的空间通常是具有挑战性的固体建设。高度可控的原子系统可以量子模拟这样的物理，即使是那些在其他平台上无法实现的物理。在这里，我们实现了玻色-爱因斯坦凝聚（BEC）的合成圆柱形表面受到净径向合成磁通。我们观察到一个受保护的拓扑带结构出现在这个霍尔圆柱，但消失在平面对应。在能带结构中观察到的BEC输运是布洛赫振荡，类似于在动量空间中的M“obius带上旅行，揭示了受非对称对称性保护的拓扑带交叉。我们表明，打破这种对称性诱导拓扑转变表现为带交叉处的间隙开放，并进一步操纵的带结构和BEC的运输通过控制轴向合成磁通量。我们的工作为使用原子量子模拟器探索非常规空间中固有的有趣拓扑现象打开了大门。
The interplay between matter particles and gauge fields in physical spaces with nontrivial geometries can lead to novel topological quantum matter. However, detailed microscopic mechanisms are often obscure, and unconventional spaces are generally challenging to construct in solids. Highly controllable atomic systems can quantum simulate such physics, even those inaccessible in other platforms. Here, we realize a Bose-Einstein condensate (BEC) on a synthetic cylindrical surface subject to a net radial synthetic magnetic flux. We observe a symmetry-protected topological band structure emerging on this Hall cylinder but disappearing in the planar counterpart. BEC's transport observed as Bloch oscillations in the band structure is analogous to traveling on a M\"obius strip in the momentum space, revealing topological band crossings protected by a nonsymmorphic symmetry. We demonstrate that breaking this symmetry induces a topological transition manifested as gap opening at band crossings, and further manipulate the band structure and BEC's transport by controlling the axial synthetic magnetic flux. Our work opens the door for using atomic quantum simulators to explore intriguing topological phenomena intrinsic in unconventional spaces.