Observation of chiral currents with ultracold atoms in bosonic ladders
Observation of chiral currents with ultracold atoms in bosonic ladders
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DOI：
10.1038/nphys2998
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发表时间：
2014-08-01
期刊：
影响因子：
19.6
通讯作者：
Bloch, Immanuel
中科院分区：
文献类型：
--
作者：
Atala, Marcos;Aidelsburger, Monika;Bloch, Immanuel
利用激光感生隧穿振幅设计光晶格，可以实现具有显著可调谐性的人工磁场。在这里，我们报告的观察手征迈斯纳电流玻色子阶梯暴露在一个强大的人工磁场。通过突然断开各个阶梯并投射到隔离的双威尔斯阱中，我们能够测量阶梯每一侧的电流。对于大的耦合强度沿着阶梯的梯级，我们发现一个饱和的最大手征电流，这是类似的迈斯纳效应中的表面电流。低于一个临界腿间耦合强度，手征电流减少与我们的预期涡晶格相。我们在一维中实现低维类迈斯纳效应和自旋轨道耦合，为探索暴露于均匀磁场的低维相互作用粒子开辟了道路。
Engineering optical lattices with laser-induced tunnelling amplitudes has enabled the realization of artificial magnetic fields with remarkable tunability. Here, we report on the observation of chiral Meissner currents in bosonic ladders exposed to a strong artificial magnetic field. By suddenly decoupling the individual ladders and projecting into isolated double wells, we are able to measure the currents on each side of the ladder. For large coupling strengths along the rungs of the ladder, we find a saturated maximum chiral current, which is analogous to the surface currents in the Meissner effect. Below a critical inter-leg coupling strength, the chiral current decreases in good agreement with our expectations for a vortex lattice phase. Our realization of a low-dimensional Meissner-like effect and spin-orbit coupling in one dimension opens the path to exploring interacting particles in low dimensions exposed to a uniform magnetic field.