Magnetic states of zigzag graphene nanoribbons from first principles

Fang Wu; Erjun Kan; Hongjun Xiang; Su-Huai Wei; Myung-Hwan Whangbo; Jinlong Yang
June 2009
Applied Physics Letters;6/1/2009, Vol. 94 Issue 22, p223105
Academic Journal
The nature of the magnetic states of zigzag graphene nanoribbons (ZGNRs) was explored on the basis of density functional calculations to understand why they are apparently nonmagnetic. Our study shows that the magnetic moments of ZGNRs are destroyed by p-type or n-type carrier doping with ∼1013 carriers/cm2 per ribbon, which is close to the amount of unpaired spins that ZGNRs are expected to have. Thus the extrinsic sources of carrier doping should be removed to observe the expected magnetic character of ZGNRs.


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