Strathprints Home | Open Access | Browse | Search | User area | Copyright | Help | Library Home | SUPrimo

Effective magnetic fields in degenerate atomic gases induced by light beams with orbital angular momenta

Juzeliunas, G. and Ohberg, P. and Ruseckas, J. and Klein, A. (2005) Effective magnetic fields in degenerate atomic gases induced by light beams with orbital angular momenta. Physical Review A, 71. ISSN 1050-2947

[img]
Preview
PDF (strathprints004979.pdf)
Download (349Kb) | Preview

    Abstract

    We investigate the influence of two resonant laser beams on the mechanical properties of degenerate atomic gases. The control and probe beams of light are considered to have Orbital Angular Momenta (OAM) and act on the three-level atoms in the Electromagnetically Induced Transparency (EIT) configuration. The theory is based on the explicit analysis of the quantum dynamics of cold atoms coupled with two laser beams. Using the adiabatic approximation, we obtain an effective equation of motion for the atoms driven to the dark state. The equation contains a vector potential type interaction as well as an effective trapping potential. The effective magnetic field is shown to be oriented along the propagation direction of the control and probe beams containing OAM. Its spatial profile can be controlled by choosing proper laser beams. We demonstrate how to generate a constant effective magnetic field, as well as a field exhibiting a radial distance dependence. The resulting effective magnetic field can be concentrated within a region where the effective trapping potential holds the atoms. The estimated magnetic length can be considerably smaller than the size of the atomic cloud.

    Item type: Article
    ID code: 4979
    Keywords: atomic physics, quantum physics, photonics, Optics. Light, Atomic and Molecular Physics, and Optics
    Subjects: Science > Physics > Optics. Light
    Department: Faculty of Science > Physics
    Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 12 Dec 2007
    Last modified: 05 Sep 2014 07:33
    URI: http://strathprints.strath.ac.uk/id/eprint/4979

    Actions (login required)

    View Item

    Fulltext Downloads: