Anomalous Kondo resonance mediated by semiconducting graphene nanoribbons in a molecular heterostructure.

ABSTRACT: Kondo resonances in heterostructures formed by magnetic molecules on a metal require free host electrons to interact with the molecular spin and create delicate many-body states. Unlike graphene, semiconducting graphene nanoribbons do not have free electrons due to their large bandgaps, and thus they should electronically decouple molecules from the metal substrate. Here, we observe unusually well-defined Kondo resonances in magnetic molecules separated from a gold surface by graphene nanoribbons in vertically stacked heterostructures. Surprisingly, the strengths of Kondo resonances for the molecules on graphene nanoribbons appear nearly identical to those directly adsorbed on the top, bridge and threefold hollow sites of Au(111). This unexpectedly strong spin-coupling effect is further co

SUBMITTER: Li Y 

PROVIDER: S-EPMC5643342 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature