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Bilayer of ultracold atoms has just a 50 nm gap
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Instead, the researchers utilized the fact that dysprosium has a very large spin magnetic moment. They lifted the degeneracy of two electronic spin states using an applied magnetic field. Atoms with opposite spins coupled to light with slightly different frequencies and opposite polarizations. The researchers sent light at both frequencies down the same optical fibre onto the same mirror. Both beams formed standing waves in the cavity. “If the frequency of these two standing waves is slightly different, then at the position where we load this bilayer array, these two standing waves are going to slightly walk off,” says
Li Du
, who is lead author on the paper describing the research. “Therefore by tuning the frequency difference we’re able to tune the interlayer separation,” he adds.
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