使用多频辐射的拓扑晶格。
Topological lattice using multi-frequency radiation.
作者信息
Andrijauskas Tomas, Spielman I B, Juzeliūnas Gediminas
机构信息
Institute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio 3, LT-10222 Vilnius, Lithuania.
Joint Quantum Institute, University of Maryland, College Park,MD20742-4111, United States of America.
出版信息
New J Phys. 2018;20. doi: 10.1088/1367-2630/aab7a3.
We describe anoveltechniqueforcreatinganartificialmagneticfieldforultracoldatomsusinga periodicallypulsedpairofcounterpropagatingRamanlasersthatdrivetransitionsbetween a pair of internal atomic spin states: a multi-frequency coupling term. In conjunction with a magnetic field gradient, this dynamically generates a rectangular lattice with a non-staggered magnetic flux. For a wide range of parameters, the resulting Bloch bands have non-trivial topology, reminiscent of Landau levels, as quantified by their Chern numbers.
我们描述了一种新颖的技术，该技术利用一对周期性脉冲的反向传播拉曼激光来驱动一对内部原子自旋态之间的跃迁，从而为超冷原子创建一个人工磁场：一个多频耦合项。结合磁场梯度，这会动态地生成一个具有非交错磁通量的矩形晶格。对于广泛的参数范围，所得到的布洛赫能带具有非平凡的拓扑结构，类似于朗道能级，可通过它们的陈数来量化。
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