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Realization of a cross-linked chiral ladder with neutral fermions in a one-dimensional optical lattice by orbital-momentum coupling
Physical Review Letters ( IF 8.6 ) Pub Date : 
Jin Hyoun Kang, Jeong Ho Han, and Y. Shin

We report the experimental realization of a cross-linked chiral ladder with ultracold fermionic atoms in a one-dimensional optical lattice. In the ladder, the legs are formed by the orbital states of the optical lattice and the complex inter-leg links are generated by the orbital-changing Raman transitions that are driven by a moving lattice potential superimposed onto the optical lattice. The effective magnetic flux per ladder plaquette is tuned by the spatial periodicity of the moving lattice, and the chiral currents are observed from the asymmetric momentum distributions of the orbitals. The effect of the complex cross links is demonstrated in quench dynamics by measuring the momentum dependence of the inter-orbital coupling strength. We discuss the topological phase transition of the chiral ladder system for the variations of the complex cross links.

中文翻译:

通过轨道动量耦合在一维光学晶格中实现具有中性费米子的交联手性阶梯的实现

我们报告在一维光学晶格中与超冷的铁离子原子交联的手性阶梯的实验实现。在梯子中,支腿是由光学晶格的轨道状态形成的,而复杂的支腿间链接是由轨道变化的拉曼跃迁产生的,拉曼跃迁是由叠加在光学晶格上的运动晶格电势驱动的。通过移动晶格的空间周期性来调整每个梯形拼块的有效磁通量,并从轨道的非对称动量分布中观察到手性电流。通过测量轨道间耦合强度的动量依赖性,在淬灭动力学中证明了复杂交联的作用。
更新日期:2018-09-19
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