Crossover from lattice to plasmonic polarons of a spin-polarised electron gas in ferromagnetic EuO

• DOI: 10.1038/s41467-018-04749-w
• Publication Date: 2018-06-07T08:54:36Z
• Authors: J. M. Riley; F. Caruso; C. Verdi; L. B. Duffy; M. D. Watson; L. Bawden; K. Volckaert; G. van der Laan; T. Hesjedal; M. Hoesch; F. Giustino; P. D. C. King
• Keywords: Charge carrier; Lattice (music)

Strong many-body interactions in solids yield a host of fascinating and potentially useful physical properties. Here, from angle-resolved photoemission experiments ab initio calculations, we demonstrate how strong coupling conduction electrons with collective plasmon excitations their own Fermi sea leads to the formation plasmonic polarons doped ferromagnetic semiconductor EuO. We observe these exhibit significant tunability charge carrier doping, leading polaronic liquid that is qualitatively distinct its more conventional lattice-dominated analogue. Our study thus suggests powerful opportunities for tailoring quantum via dilute doping.