SCHEDULED MAINTENANCE
Spin-resolved transport properties in zigzag α-graphyne nanoribbons with symmetric and asymmetric edge fluorinations
Abstract
Using the non-equilibrium Green's function method and the spin-polarized density functional theory, we investigate the stability and spin-resolved electronic transport properties of zigzag α-graphyne nanoribbons (ZαGYNRs) with symmetric (F-ZαGYNRs-F) and asymmetric (F2-ZαGYNRs-F) edge fluorinations. Our results show edge fluorination can enhance the stability of ZαGYNRs. The spin-resolved transport calculations reveal that the devices of F-ZαGYNRs-F with odd ribbon widths behave as a conductor with a linear current–voltage relationship, while the semiconductor property and perfect bipolar spin-filtering effect can be observed in those devices with even ribbon widths. In contrast, the spin-resolved transport properties of the asymmetric edge fluorinated F2-ZαGYNRs-F systems are independent of the ribbon width. Moreover, the F2-ZαGYNRs-F device is a perfect spin device with nearly 100% bipolar spin-filtering and spin negative differential resistance effects in a wide bias voltage region. And the magnetoresistance effect with the order of 106 and the spin rectification ratio as high as 108 have also been predicted. These phenomena suggest ZαGYNRs with asymmetric edge fluorination can be considered as a promising candidate material for nano-electronics and spintronics.
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