KRAKOW, Poland, June 23, 2020 — Ultracold atoms trapped in appropriately prepared optical traps can arrange themselves in complex, hitherto unobserved structures, according to scientists from the Institute of Nuclear Physics of the Polish Academy of Sciences (IFJ PAN). In accordance with their recent work, the scientists said, matter in optical lattices should form tensile and inhomogeneous quantum rings in a controlled manner. When two laser beams are matched properly, it is possible to create an optical lattice with well-known properties, the scientists said. 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