Physicists observe competition between magnetic orders

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IMAGE: The system: A crystal lattice made of light traps atoms in several bilayer sheets. Tomographic images show the (spin-) densities in a single layer. They provide information about the magnetic...
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Credit: © Marcell Gall, Nicola Wurz et al./ Nature
They are as thin as a hair, only a hundred thousand times thinner--so-called two-dimensional materials, consisting of a single layer of atoms, have been booming in research for years. They became known to a wider audience when two Russian-British scientists were awarded the Nobel Prize in Physics in 2010 for the discovery of graphene, a building block of graphite. The special feature of such materials is that they possess novel properties that can only be explained with the help of the laws of quantum mechanics and that may be relevant for enhanced technologies. Researchers at the University of Bonn (Germany) have now used ultracold atoms to gain new insights into previously unknown quantum phenomena. They found out that the magnetic orders between two coupled thin films of atoms compete with each other. The study has been published in the journal

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