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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Donostia Int Phys Ctr, San Sebastian 20018, Spain
Basque Fdn Sci, Ikerbasque, Bilbao, SpainDonostia Int Phys Ctr, San Sebastian 20018, Spain
Garcia-Lekue, Aran
Sanchez-Portal, Daniel
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Donostia Int Phys Ctr, San Sebastian 20018, Spain
CSIC, UPV EHU, Mat Phys Ctr, San Sebastian, SpainDonostia Int Phys Ctr, San Sebastian 20018, Spain