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

G. Juzeliunas, J. Ruseckas, P. Ohberg

Research output: Contribution to journalArticle

17 Citations (Scopus)

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.
LanguageEnglish
Pages4171-4183
Number of pages12
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume38
Issue number23
DOIs
Publication statusPublished - 2005

Fingerprint

cold gas
monatomic gases
laser beams
magnetic fields
probes
atoms
magnetic monopoles
center of mass
equations of motion
angular momentum
energy levels
trapping
traps
orbitals
propagation
rings
profiles
geometry
configurations
approximation

Keywords

  • magnetic fields
  • atomic physics
  • gases
  • electromagnetically induced transparency

Cite this

Juzeliunas, G. ; Ruseckas, J. ; Ohberg, P. / Effective magnetic fields induced by EIT in ultra-cold atomic gases. In: Journal of Physics B: Atomic, Molecular and Optical Physics. 2005 ; Vol. 38, No. 23. pp. 4171-4183.
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Effective magnetic fields induced by EIT in ultra-cold atomic gases. / Juzeliunas, G.; Ruseckas, J.; Ohberg, P.

In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 38, No. 23, 2005, p. 4171-4183.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effective magnetic fields induced by EIT in ultra-cold atomic gases

AU - Juzeliunas, G.

AU - Ruseckas, J.

AU - Ohberg, P.

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N2 - 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.

AB - 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.

KW - magnetic fields

KW - atomic physics

KW - gases

KW - electromagnetically induced transparency

UR - http://arxiv.org/abs/quant-ph?papernum=0511087

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