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4、wooLeeetalThiscontentwasdownloadedfromIPaddress117.165.43.125on21/08/2018at08:59ElectronicstructureandthefieldemissionmechanismofMgO-coatedcarbonnanotubesYoung-WooSon1,SeungwuHan2,3andJisoonIhm11SchoolofPhysics,SeoulNationalUniversity,Seoul151-742,Korea2PrincetonMaterialsI
5、nstitute,PrincetonUniversity,Princeton,NJ08544,USA3DepartmentofPhysics,EwhaWomansUniversity,Seoul120-750,KoreaE-mail:jihm@snu.ac.krNewJournalofPhysics5(2003)152.1–152.9(http://www.njp.org/)Received4August2003Published14November2003Abstract.Inanattempttoimprovethefieldemiss
6、ion(FE)characteristicsofcarbonnanotubes(CNTs),wehaveperformedafirst-principlesstudyonMgO-coatedCNTs.AMgOslabcoveringaCNTtipunderastrongelectricfieldshowsdielectricscreeningbehaviourswithappliedelectricfieldsupto0.3VÅ−1andtheeffectivedielectricconstantapproachesthebulkvaluewi
7、thinafewMgOlayers.ItisalsofoundthatthesurfaceconductionbandstateoftheMgOslabshiftsdowntotheFermilevelastheappliedelectricfieldincreases,indicatingaFEmechanismdifferenttothatforCNTswithoutinsulatorcoating.ElectronemissionviathesurfaceconductionbandoftheinsulatorattheFermile
8、velisexpectedtoenhancetheFEcurrentsignificantly,inagreementwitharecentexperiment.Contents1Introdu
