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28 March 2024
 
  » pubmed » pmid16090590

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Non-Abelian gauge potentials for ultracold atoms with degenerate dark states
J Ruseckas ; G Juzeliƫnas ; P Ohberg ; M Fleischhauer ;
Date 1 Jul 2005
Journal Phys Rev Lett, 95 (1), 010404
AbstractWe show that the adiabatic motion of ultracold, multilevel atoms in spatially varying laser fields can give rise to effective non-Abelian gauge fields if degenerate adiabatic eigenstates of the atom-laser interaction exist. A pair of such degenerate dark states emerges, e.g., if laser fields couple three internal states of an atom to a fourth common one under pairwise two-photon-resonance conditions. For this so-called tripod scheme we derive general conditions for truly non-Abelian gauge potentials and discuss special examples. In particular we show that using orthogonal laser beams with orbital angular momentum an effective magnetic field can be generated that has a monopole component.
Source PubMed, pmid16090590
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