Jungmin Park, Inseon Oh, Mi-Jin Jin, Junhyeon Jo, Daeseong Choe, Hyung Duk Yun, Suk Woo Lee, Zonghoon Lee, Soon-Yong Kwon, Hosub Jin, Suk Bum Chung & Jung-Woo Yoo
Scientific Reports, 10, Article number: 4784 (March 2020)
The pristine graphene described with massless Dirac fermion could bear topological insulator state and ferromagnetism via the band structure engineering with various adatoms and proximity effects from heterostructures. In particular, topological Anderson insulator state was theoretically predicted in tight-binding honeycomb lattice with Anderson disorder term. Here, we introduced physi-absorbed Fe-clusters/adatoms on graphene to impose exchange interaction and random lattice disorder, and we observed Anderson insulator state accompanying with Kondo effect and field-induced conducting state upon applying the magnetic field at around a charge neutral point. Furthermore, the emergence of the double peak of resistivity at ν = 0 state indicates spin-splitted edge state with high effective exchange field (>70 T). These phenomena suggest the appearance of topological Anderson insulator state triggered by the induced exchange field and disorder.