论文标题
观察在2D准晶光学晶格中定位
Observing localisation in a 2D quasicrystalline optical lattice
论文作者
论文摘要
准晶体是长期有序的，但不是周期性的，代表了秩序和混乱之间有趣的中间立场。我们在八倍的对称准晶光学晶格中实验和数值研究非相互作用玻色子的基态。我们找到了弱晶格的扩展状态，但在$ v_0 = 1.78（2）\，e _ {\ mathrm {rec}} $的晶格深度下观察定位过渡。我们通过测量绝热载荷到晶格所需的时间尺度来确定这种过渡，该时间尺度在临界晶格深度处分歧以定位。 GROSS-PITAEVSKII模拟表明，在相互作用的系统中，过渡转移到了更深的晶格，如超流体顺序抵消定位所预期的那样。我们的实验结果与这种平均场偏移一致。缺乏常规稀有区域的准碘潜力为实现2D中的多体定位提供了理想的测试场。
Quasicrystals are long-range ordered but not periodic, representing an interesting middle ground between order and disorder. We experimentally and numerically study the ground state of non- and weakly-interacting bosons in an eightfold symmetric quasicrystalline optical lattice. We find extended states for weak lattices but observe a localisation transition at a lattice depth of $V_0=1.78(2)\,E_{\mathrm{rec}}$ for the non-interacting system. We identify this transition by measuring the timescale required for adiabatic loading into the lattice, which diverges at the critical lattice depth for localisation. Gross-Pitaevskii simulations show that in interacting systems the transition is shifted to deeper lattices, as expected from superfluid order counteracting localisation. Our experimental results are consistent with such a mean-field shift. Quasiperiodic potentials, lacking conventional rare regions, provide the ideal testing ground to realise many-body localisation in 2D.
