Quasiparticles known as repulsive polarons are predicted to occur when 'impurity' fermionic particles interact repulsively with a fermionic environment. They have now been detected in two widely differing systems. See Letters p.615 & p.619
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Hannaford, P. Repulsive polarons found. Nature 485, 588–589 (2012). https://doi.org/10.1038/nature11196
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DOI: https://doi.org/10.1038/nature11196
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