title: Edge contact dependent spin transport for n-type doping zigzag-graphene with asymmetric edge hydrogenation.
abstract: Spin transport features of the n-type doping zigzag graphene nanoribbons (ZGNRs) with an edge contact are investigated by first principle methods, where ZGNRs are C-H2 bonded at one edge while C-H bonded at the other to form an asymmetric edge hydrogenation. The results show that a perfect spin filtering effect (100%) in such ZGNR nanojunctions can be achieved in a very large bias region for the unchanged spin states regardless of bias polarities, and the nanojunction with a contact of two C-H2 bonded edges has larger spin polarized current than that with a contact of two C-H bonded edges. The transmission pathways and the projected density of states (PDOS) demonstrate that the edge of C-H2 bonds play a crucial role for the spin magnetism and spin-dependent transport properties. Moreover, the negative differential resistance (NDR) effect is also observed in the spin-polarized current.
authors: School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410114, China.
authors: Xiaoqing
authors: X
authors: Deng
authors: School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410114, China.
authors: Zhenhua
authors: Z
authors: Zhang
authors: School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410114, China.
authors: Guiping
authors: G
authors: Tang
authors: School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410114, China.
authors: Zhiqiang
authors: Z
authors: Fan
authors: School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410114, China.
authors: Huali
authors: H
authors: Zhu
authors: School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410114, China.
authors: Changhu
authors: C
authors: Yang