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PhysicaE33(2006)147–150Theeffectofelectricalimpurityonquantumconductanceinasimplecubicnano-wireMohammadMardaania,b,,HosseinMardaanicaPhysicsGroup,FacultyofScience,ShahrekordUniversity,P.O.Box115,Shahrekord,IranbComputationalPhysicalScienceResearchLaboratory,DepartmentofNano-Science,InstituteforStudiesinTheoreticalPhysicsandMathematics(IPM),Tehran,IrancDepartmentofElectricalEngineering,ShahrekordUniversity,P.O.Box115,Shahrekord,IranReceived3October2005;accepted23January2006Availableonline29March2006AbstractInthepresentwork,theeffectofacentralelectricalimpurity(dipole)onquantumconductanceinsimplecubicnano-wires(SCNW)hasbeeninvestigatedinthetight-binding(TB)approachandassumingnearest-neighborinteractionbyGreen’sfunction(GF)method.Weillustratethatinthepresenceofelectricalimpurity(externalpotential),thenumberofchannelsandenergybandofnano-wiredecrease.Thevariationoftheenergybandandthenumberofchannelsdependonthepositionandamountoftheelectricalcharge(dipolemoment)intheSCNW.r2006PublishedbyEls...