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Spontaneous spin Hall effect of ultracold atoms

Moving charges get deflected by a magnetic field, an effect which underlies such applications as isotope separation and the quantum Hall effect which fixes the International standard for electrical resistance.
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A similar effect in which the spin current of an electron gets deflected
is termed the spin Hall effect, and its existence relies on the relativistic spin-orbit coupling in
a solid. In work which has recently appeared in Nature Communications, Prof. Arun Paramekanti
and collaborators at the University of Maryland and the Joint Quantum Institute, show how
such a spin Hall effect can arise in an entirely different manner, from interactions between
particles and a mechanism called `order by disorder', in ultracold atomic gases, paving the
way for future realizations and applications of this effect in solids.

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Link to paper -