2015/08/13 by Guang-Yao Song, Song, Guang-Yao, Qinghong Yuan +4
Materials Science · Physics and Astronomy · Engineering · #Graphene research and applications #Quantum and electron transport phenomena #Molecular Junctions and Nanostructures
paper · pdf · doi:10.48550/arxiv.1508.03098
The electronic and magnetic properties of zigzag graphene nanoribbons with asymmetric notches along their edges are investigated by first principle density functional theory calculations. It is found that the electronic and magnetic properties of the asymmetrically-notched graphene nanoribbons are closely related with the depth of notches, but weekly dependent on the length of notches. As the relative depth of notch increases, the energy level of spin-up and spin-down becomes greatly shifted, associated with the gradual increase of magnetic momentum. The asymmetric band shift allows the asymmetrically notched graphene nanoribbons to be a spintronic semiconductor, through which an N- or P-type spin-semiconductor can be obtained by doping B or N atoms.