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arXiv · 1607.07338

Nano-Scale `Dark State' Optical Potentials for Cold Atoms

M. Łącki·M. Baranov·H. Pichler·P. Zoller
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Abstract

We discuss generation of subwavelength optical barriers on the scale of tens of nanometers, as conservative optical potentials for cold atoms. These arise from non-adiabatic corrections to Born-Oppenheimer potentials from dressed `dark states' in atomic $Λ$-configurations. We illustrate the concepts with a double layer potential for atoms obtained from inserting an optical subwavelength barrier into a well generated by an off-resonant optical lattice, and discuss bound states of pairs of atoms interacting via magnetic dipolar interactions. The subwavelength optical barriers represent an optical `Kronig-Penney' potential. We present a detailed study of the bandstructure in optical `Kronig-Penney' potentials, including decoherence from spontaneous emission and atom loss to open `bright' channels.

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M. Łącki, M. Baranov, H. Pichler, P. Zoller. 2016-10-25. Nano-Scale `Dark State' Optical Potentials for Cold Atoms. https://doi.org/10.1103/physrevlett.117.233001

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