• 文献标题:   Observation of spin-polarized Anderson state around charge neutral point in graphene with Fe-clusters
  • 文献类型:   Article
  • 作  者:   PARK J, OH I, JIN MJ, JO J, CHOE D, YUN HD, LEE SW, LEE Z, KWON SY, JIN H, CHUNG SB, YOO JW
  • 作者关键词:  
  • 出版物名称:   SCIENTIFIC REPORTS
  • ISSN:   2045-2322
  • 通讯作者地址:   Ulsan Natl Inst Sci Technol
  • 被引频次:   0
  • DOI:   10.1038/s41598-020-61481-6
  • 出版年:   2020

▎ 摘  要

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 nu = 0 state indicates spin-splitted edge state with high effective exchange field (>70T). These phenomena suggest the appearance of topological Anderson insulator state triggered by the induced exchange field and disorder.