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Introducing strong correlation effects into graphene by gadolinium intercalation

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arxiv 1909.08023 v1 pith:RH77AILL submitted 2019-09-17 cond-mat.str-el cond-mat.mtrl-sci

Introducing strong correlation effects into graphene by gadolinium intercalation

S. Link , S. Forti , A. St\"ohr , K. K\"uster , M. R\"osner , D. Hirschmeier , C. Chen , J. Avila
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M.C. Asensio A.A. Zakharov T.O. Wehling A.I. Lichtenstein M.I. Katsnelson U. Starke
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classification cond-mat.str-el cond-mat.mtrl-sci
keywords electronicgraphenestrongbandscorrelationsdevelopdrivenground
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Exotic ordered ground states driven by electronic correlations are expected to be induced in monolayer graphene when doped to the Van Hove singularity. Such doping levels are reached by intercalating Gd in graphene on SiC(0001), resulting in a strong homogeneity and stability. The electronic spectrum now exhibits severe renormalizations. Flat bands develop which is driven by electronic correlations according to our theoretical studies. Due to strong electron-phonon coupling in this regime, polaron replica bands develop. Thus, interesting ordered ground states should be made accessible.

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