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Using density functional theory and non-equilibrium Greens functiontechnique, we performed theoretical investigations on the transport propertiesof several ZAZ SiNRs junctions,a similar kind of silicene molecules junctioncombined by zigzag and armchair silicene nanoribbons. It is found that thedifferential conductances of the three systems decrease with an order of5-ZAZ>4-ZAZ>3-ZAZ.Particularly,the Negative differential resistance can beobserved within certain bias voltage range only in 3-ZAZ SiNRs. In order toelucidate the mechanism the NDR behavior, the transmission spectra andmolecular projected selfconsistent Hamiltonian states are discussed in details.

Electronic transport through a silicene-based zigzag and armchair junction