A gate tunes the screening of magnetic molecules on graphene
After cobalt phthalocyanine molecules were adsorbed onto graphene, changing the carrier density altered how graphene electrons screened the molecular moments.
Baoming Yan and colleagues deposited cobalt phthalocyanine molecules on graphene and used low-temperature transport to probe the interaction between electrons and local magnetic moments. At high carrier density, Kondo screening persisted up to about 20 K.
Reducing the carrier density with a gate weakened the screening. The paper, with Liyuan Zhang and Xiaosong Wu as corresponding authors, appeared in the September 2018 volume of Solid State Communications.