Matter-Wave Diffraction from a Quasicrystalline Optical Lattice.
Matter-Wave Diffraction from a Quasicrystalline Optical Lattice.
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DOI：
10.1103/physrevlett.122.110404
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发表时间：
2018-07
影响因子：
8.6
通讯作者：
Konrad Viebahn;Matteo Sbroscia;E. Carter;Jr-Chiun Yu;U. Schneider
中科院分区：
文献类型：
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作者：
Konrad Viebahn;Matteo Sbroscia;E. Carter;Jr-Chiun Yu;U. Schneider
准晶体是长程有序的，但非周期性的。这种相互作用导致了许多有趣的物理现象，例如从更高维度继承拓扑特性，以及所有尺度上非平凡结构的存在。在这里，我们报告了八重旋转对称光学晶格的首次实验演示，实现了超冷原子的二维准晶潜力。使用物质波衍射，我们观察到这种准晶体结构的自相似性，与使用电子衍射首次发现准晶体非常相似。短时间尺度上的衍射动力学构成了均匀四维紧束缚晶格上的连续时间量子行走。这些测量为分形结构和更高维度的量子模拟铺平了道路。
Quasicrystals are long-range ordered and yet nonperiodic. This interplay results in a wealth of intriguing physical phenomena, such as the inheritance of topological properties from higher dimensions, and the presence of nontrivial structure on all scales. Here, we report on the first experimental demonstration of an eightfold rotationally symmetric optical lattice, realizing a two-dimensional quasicrystalline potential for ultracold atoms. Using matter-wave diffraction we observe the self-similarity of this quasicrystalline structure, in close analogy to the very first discovery of quasicrystals using electron diffraction. The diffraction dynamics on short timescales constitutes a continuous-time quantum walk on a homogeneous four-dimensional tight-binding lattice. These measurements pave the way for quantum simulations in fractal structures and higher dimensions.