Generalized Rashba-Dresselhaus spin-orbit coupling for cold atoms
Generalized Rashba-Dresselhaus spin-orbit coupling for cold atoms
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DOI：
10.1103/physreva.81.053403
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发表时间：
2010-05-01
影响因子：
2.9
通讯作者：
Dalibard, Jean
中科院分区：
文献类型：
--
作者：
Juzeliunas, Gediminas;Ruseckas, Julius;Dalibard, Jean
我们研究了利用激光束将N原子内部基态共振耦合到一个额外态，从而产生一种新的冷原子质心运动的自旋轨道耦合的可能性。在对该方案进行了一般分析后，我们集中讨论了四脚体设置（N = 4），其中原子状态可以由三分量旋量描述，在自旋为1的粒子的Rashba-Dresselhaus型自旋轨道耦合的作用下演化。我们说明了这种耦合的后果，通过研究原子的负折射在一个潜在的步骤，并表明折射光束的振幅显着增加相比，自旋1/2 Rashba-Dresselhaus耦合的已知情况。最后，我们探讨了一种可能的实现这种四脚设置，使用受激拉曼耦合之间的塞曼子碱金属原子的基态。
We study the possibility for generating a new type of spin-orbit coupling for the center-of-mass motion of cold atoms, using laser beams that resonantly couple N atomic internal ground states to an extra state. After a general analysis of the scheme, we concentrate on the tetrapod setup (N = 4) where the atomic state can be described by a three-component spinor, evolving under the action of a Rashba-Dresselhaus-type spin-orbit coupling for a spin 1 particle. We illustrate a consequence of this coupling by studying the negative refraction of atoms at a potential step and show that the amplitude of the refracted beam is significantly increased in comparison to the known case of spin 1/2 Rashba-Dresselhaus coupling. Finally, we explore a possible implementation of this tetrapod setup, using stimulated Raman couplings between Zeeman sublevels of the ground state of alkali-metal atoms.