Observation of spin-polarized Anderson state around charge neutral point in graphene with Fe-clusters

被引：0

作者：

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

机构：

[1] School of Materials Science and Engineering,

[2] Ulsan National Institute of Science and Technology,undefined

[3] Center for Scientific Instrumentation,undefined

[4] Division of Scientific Instrumentation & Management,undefined

[5] Korea Basic Science Institute,undefined

[6] Center for Multidimensional Carbon Materials,undefined

[7] Institute for Basic Science (IBS),undefined

[8] Department of Physics,undefined

[9] Ulsan National Institute of Science and Technology,undefined

[10] Department of Physics,undefined

[11] University of Seoul,undefined

来源：

Scientific Reports | / 10卷

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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 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.

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