Anderson R P, Trypogeorgos D, Valdés-Curiel A, Liang Q-Y, Tao J, Zhao M, Andrijauskas T, Juzeliūnas G, Spielman I B
Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA.
School of Physics and Astronomy, Monash University, Melbourne, Victoria 3800, Australia.
Phys Rev Res. 2020;2(1). doi: 10.1103/physrevresearch.2.013149.
We propose and describe our realization of a deeply subwavelength optical lattice for ultracold neutral atoms using resonantly Raman-coupled internal degrees of freedom. Although counterpropagating lasers with wavelength provided two-photon Raman coupling, the resultant lattice period was /2, an -fold reduction as compared to the conventional /2 lattice period. We experimentally demonstrated this lattice built from the three = 1 Zeeman states of a Rb Bose-Einstein condensate, and generated a lattice with a /6 = 132 nm period from = 790 nm lasers. Lastly, we show that adding an additional rf-coupling field converts this lattice into a superlattice with wells uniformly spaced within the original /2 unit cell.
我们提出并描述了一种利用共振拉曼耦合内部自由度为超冷中性原子实现深亚波长光学晶格的方法。尽管波长为 的反向传播激光提供了双光子拉曼耦合，但所得晶格周期为 /2，与传统的 /2晶格周期相比减小了 倍。我们通过实验证明了这种由铷玻色 - 爱因斯坦凝聚体的三个 = 1塞曼态构建的晶格，并利用 = 790 nm激光生成了周期为 /6 = 132 nm的晶格。最后，我们表明添加一个额外的射频耦合场可将此晶格转换为一个超晶格，其中阱在原始的 /2晶胞内均匀间隔分布。
