Electrical and transport properties of twisted armchair graphene nanoribbons tailored by uniaxial strain

摘要

In this paper, the transport properties of twisted armchair graphene nanoribbons (AGNRs), tailored by tensile and compressive strains are studied, using an semi-empirical tight-binding model combined with nonequilibrium Green's function (NEGF) method. The results show that the transport properties of moderate-gap and wide-gap AGNRs change remarkably by applying twisting, while the narrow-gap AGNRs seem to be almost robust. As the twist angle increases, the transmission values decrease in the bias window for 8- and 9-AGNRs and consequently cause the current to reduce, while for 10-AGNRs, the increase of transmission within the bias window leads to increase of the current. On the other hand, we have found that applying strain does not affect the transport properties of twisted graphene nanoribbions significantly, and just a small change is observed in the extracted values. These results would be helpful for the design of graphene-based nanodevices.