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arXiv 1002.0578cond-mat.quant-gasquant-ph
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冷原子的广义Rashba自旋轨道耦合

Generalized Rashba spin-orbit coupling for cold atoms

Gediminas Juzeliunas, Julius Ruseckas, Jean Dalibard

摘要:

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,使冷原子的质心运动产生一种新型的自旋轨道耦合的可能性.在对该方案进行了一般分析后,我们集中讨论了四足结构(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型自旋轨道耦合作用下演化。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级的碱金属原子的基态。

英文摘要:

We study the possibility to generate 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-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 coupling. Finally we explore a possible implementation of this tetrapod setup, using stimulated Raman couplings between Zeeman sublevels of the ground state of alkali atoms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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