Impurity induced spin filtering in graphene nanoribbons

Zheng, X. H.; Wang, R. N.; Song, L. L.; Dai, Z. X.; Wang, X. L.; Zeng, Z.
September 2009
Applied Physics Letters;9/21/2009, Vol. 95 Issue 12, p123109
Academic Journal
Zigzag-edged graphene nanoribbons (ZGNRs) are used to build devices in which transport with high spin polarization is realized by first-principles simulations. At first, we dope the semiconducting ZGNRs with B atoms on both sides to obtain a metallic ribbon. Then, in one segment of this ribbon which acts as the scattering region, the B atoms at one edge are substituted by C atoms or by N atoms. It is found that such devices show very good spin filtering effect which originates from the interaction between the impurity atoms and the edge states.


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