Abstract
We analyze a tripod atom light coupling scheme characterized by two
dark states playing the role of quasi-spin states. It is demonstrated
that by properly configuring the coupling laser fields, one can create a
lattice with spin-dependent sub-wavelength barriers. This allows to
flexibly alter the atomic motion ranging from atomic dynamics in the
effective brick-wall type lattice to free motion of atoms in one dark
state and a tight binding lattice with a twice smaller periodicity for
atoms in the other dark state. Between the two regimes, the spectrum
undergoes significant changes controlled by the laser fields. The tripod
lattice can be produced using current experimental techniques. The use
of the tripod scheme to create a lattice of degenerate dark states opens
new possibilities for spin ordering and symmetry breaking.
Subject
General Physics and Astronomy
Cited by
4 articles.
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