Double and negative reflection of cold atoms in non-Abelian gauge potentials

Details Double and negative reflection of cold atoms in non-Abelian gauge potentials Double and negative reflection of cold atoms in non-Abelian gauge potentials

2008-01-14

arxiv.org/abs/0801.2056v2

Phys. Rev. Lett. 100, 200405 (2008)

Physics

Condensed Matter

Other Condensed Matter

5 figures corrected references

Scientific paper

10.1103/PhysRevLett.100.200405

Atom reflection is studied in the presence of a non-Abelian vector potential proportional to a spin-1/2 operator. The potential is produced by a relatively simple laser configuration for atoms with a tripod level scheme. We show that the atomic motion is described by two different dispersion branches with positive or negative chirality. As a consequence of that, atom reflection shows unusual features, since an incident wave may split into two reflected ones at a barrier, an ordinary specular reflection, and an additional non-specular one. Remarkably, the latter wave can exhibit negative reflection and may become evanescent if the angle of incidence exceeds a critical value. These reflection properties are crucial for future designs in non-Abelian atom optics.

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