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Effective magnetic fields induced by EIT in ultra-cold atomic gases

Juzeliunas, G. and Ruseckas, J. and Ohberg, P. (2005) Effective magnetic fields induced by EIT in ultra-cold atomic gases. Journal of Physics B: Atomic, Molecular and Optical Physics, 38 (23). pp. 4171-4183. ISSN 0953-4075

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    Abstract

    We study the influence of two resonant laser beams (to be referred to as the control and probe beams) on the centre-of-mass motion of ultra-cold atoms characterized by three energy levels of the Λ-type. The laser beams being in the electromagnetically induced transparency (EIT) configuration drive the atoms to their dark states. We impose the adiabatic approximation and obtain an effective equation of motion for the dark state atoms. The equation contains a vector potential type interaction as well as an effective trapping potential. We concentrate on the situation where the control and probe beams are co-propagating and have orbital angular momenta (OAM). The effective magnetic field is then oriented along the propagation direction of the control and probe beams. Its spatial profile can be shaped by choosing proper laser beams. We analyse several situations where the effective magnetic field exhibits a radial dependence. In particular, we study effective magnetic fields induced by Bessel beams, and demonstrate how to generate a constant effective magnetic field for a ring geometry of the atomic trap. We also discuss a possibility of creating an effective field of a magnetic monopole.

    Item type: Article
    ID code: 5216
    Keywords: magnetic fields, atomic physics, gases, electromagnetically induced transparency, Optics. Light, Atomic and Molecular Physics, and Optics, Condensed Matter Physics
    Subjects: Science > Physics > Optics. Light
    Department: Faculty of Science > Physics
    Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 21 Jan 2008
    Last modified: 04 Sep 2014 20:07
    URI: http://strathprints.strath.ac.uk/id/eprint/5216

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