“School of Nano-Sciences”
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| Paper IPM / Nano-Sciences / 11872 |
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| Abstract: | |||||
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The geometry dependence of electrical conductance is theoretically studied in a new type of glider-like junction, which consists of two semi-infinite clean metallic armchair graphene nanoribbon (AGNR) leads separated by a carbon nanotube (CNT) spacer. Our calculations are based on the non-equilibrium Green's function (NEGF) quantum transport method within the atomistic nearest-neighbor tight-binding model in the coherent regime. It is found that the conductance depends strongly on the width of GNR, and the length and diameter of CNT, which shows oscillatory behavior around the Fermi energy when the CNT helicity is even and the width of GNR be equal to 6k - 1 (k is an integer). Otherwise, the band gap appears, and its value increases with increasing the CNT helicity. The main reason can be explained by the symmetric and asymmetric connection of CNT to the leads and quantum interference effect. By controlling the system size (length and diameter), we can control the band gap energy of system and consequently its electrical properties. Our results may have important applications in the nano-electronic devices based on GNRs and CNTs.
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