Optical flux lattice using multi-frequency radiation
Ultracold atomic gases are systems exhibiting various condensed matter
phenomena. The ultracold atoms are neutral, so under usual
circumstance they do not exhibit important magnetic phenomena, like
the quantum Hall effect. Possible ways to create artificial magnetic
field for ultracold atoms include rotation of an atomic cloud,
laser-assisted tunnelling, shaking of optical lattices. Yet it is
difficult to reach considerable magnetic fluxes required for achieving
the fractional Hall effect.
We theoretically analyse another way of creating a non-staggered
magnetic flux for ultra-cold atoms by using a periodic sequence of
short laser pulses providing a multi-frequency perturbation. In
particular, we consider a possibility to create a square flux lattice
for ultra-cold atoms characterized by two internal states. The
energies of the two internal states have opposite gradients in one
spatial direction, while the driving consists of periodic in time
pulses that couple the internal states and propagate in a direction
perpendicular to the energy gradient. The time-depending perturbation
effectively creates a square optical lattice affected by a
non-staggered magnetic flux.
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