Electronic and thermoelectric transport properties for an armchair graphene-silicene-graphene heterojunction modulated by external field

摘要

We analytically investigate effective spin orbit coupling (SOC) and potential energy on electronic and thermoelectric transport properties for a graphene-silicene-graphene (GSG) heterojunction with armchair-edge nanoribbons using nonequilibrium Green's function method. The calculation shows that the transmission coefficient T and the charge Seebeck coefficient S-C for armchair-edge GSG junctions display the oscillatory behavior and depend sensitively on both effective SOC lambda(SO) and the potential energy V-0. Compared with zigzag-edge GSG heterojunctions, armchair-edge GSG heterojunctions are found to posses superior thermoelectric performance, their charge Seebeck coefficients can be improved by one order of magnitude. (C) 2016 Elsevier B.V. All rights reserved.