Observing Localization in a 2D Quasicrystalline Optical Lattice.
Observing Localization in a 2D Quasicrystalline Optical Lattice.
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DOI：
10.1103/physrevlett.125.200604
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发表时间：
2020-11
影响因子：
8.6
通讯作者：
Matteo Sbroscia;Konrad Viebahn;E. Carter;Jr-Chiun Yu;Alexander L. Gaunt;U. Schneider
中科院分区：
文献类型：
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作者：
Matteo Sbroscia;Konrad Viebahn;E. Carter;Jr-Chiun Yu;Alexander L. Gaunt;U. Schneider
准晶是长程有序的，但不是周期性的，代表了有序和无序之间有趣的中间地带。用实验和数值方法研究了八重对称准晶光学晶格中非相互作用玻色子和弱相互作用玻色子基态的局域化跃迁。与通常使用的实空间原位技术不同，我们通过记录物质波的衍射图来探测动量空间中的系统。浅晶格导致扩展态，而对于非相互作用系统，我们在临界晶格深度V_{0}≈_1·78(2)E_{rec}处观察到局域化相变。我们的测量和Gross-Pitaevskii模拟表明，在相互作用的系统中，相变向更深的晶格移动，正如超流有序抵消局域化所预期的那样。准周期势场缺少常规稀有区域，为实现二维多体定位提供了理想的试验场。
Quasicrystals are long-range ordered but not periodic, representing an interesting middle ground between order and disorder. We experimentally and numerically study the localization transition in the ground state of noninteracting and weakly interacting bosons in an eightfold symmetric quasicrystalline optical lattice. In contrast to typically used real space in situ techniques, we probe the system in momentum space by recording matter wave diffraction patterns. Shallow lattices lead to extended states whereas we observe a localization transition at a critical lattice depth of V_{0}≈1.78(2)E_{rec} for the noninteracting system. Our measurements and Gross-Pitaevskii simulations demonstrate that in interacting systems the transition is shifted to deeper lattices, as expected from superfluid order counteracting localization. Quasiperiodic potentials, lacking conventional rare regions, provide the ideal testing ground to realize many-body localization in 2D.