Generalized Rashba spin-orbit coupling for cold atoms

Details Generalized Rashba spin-orbit coupling for cold atoms Generalized Rashba spin-orbit coupling for cold atoms

2010-02-02

arxiv.org/abs/1002.0578v2

Phys. Rev. A 81, 053403 (2010)

Physics

Condensed Matter

Quantum Gases

8 figures; corrected typos and figures

Scientific paper

10.1103/PhysRevA.81.053403

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.

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