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A 2-level condensate of spin-1 Na atoms under a magnetic field B with its spin modes decoupled from its spatial modes is studied. This system can emerge at very low temperature by putting an atom with its spin down into a fully polarized condensate with all $$N-1$$ N - 1 spins up, similar to embedding an impurity into a well-organized system. The most distinguished feature of this 2-level...
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