31224.基于二維材料硅烯的自旋過濾器件和自旋分離器件

1、基于二維材料硅烯的自旋過濾器件和自旋分離器件SiliceneasspinfilterandspinseparatorYongXu導(dǎo)師：蔣永進(jìn)教授Supervisor：ProfYongjinJiang浙江師范大學(xué)凝聚態(tài)物理研究所InstituteofCondensedMatterPhysicsZhejiangNormalUniversity五月，2014May2014凝聚態(tài)物理專業(yè)碩士學(xué)位論文Thesiso下theMscDegreeinC

2、ondensedMatterPhysicsAbstractUsingthemolecularcpitaxialmethod，Vogycta1achievedsilicenegrownontheAg(111)substratein2012Siliccnehaveattractedextensivelyattentionbecauseofits2dimensionhoneycombstructureanduniquepaysicalprop

3、ertiesThelargespin—orbitcoupling(SOC)ofsiliceneascribedtothebuckledstructuremakeittobehopefultealizethetopologicalinsulatorandidealmaterialforspintronicdevicesinthefutureInthisthesis，weintroducetheexperimentalprogressand

4、theoreticalresultsofsiliceneBasedonthenovelphysicalproperties，spintransportpropertiesofspinseparatedevicesaboutsiliccnehavebccnanalyzedanddiscussedbynumer—icalcalculationInthefirstchapter，theexperimentalprogressandtheore

5、ticalresultsrelatedtogeometrystructureandpaysicalpropertiesofsiliceneworeintroducedBesides，thelowenergyfourbandeffectiveHamiltonianofsilicenewaspresentedwithsymmetryconsiderationsofsilicenestructureandfirst—principlescal

6、culationBytight—bindingmethod，theelectronicstructureofvarioussilicenephaseshavebeenstudiedCombiningwiththeapplicationofelectricfieldEztocontrolthegapoftheenergybandandtheexchangefieldMtoinducethespin—splitofelectronicstr

7、ucture，theinterestingphaseofsilicene，suchasquantumanomalousHall(QAH)insulator，valleypolarizedmetal(VPM)，marginalvalleypolarizedmetal(M～VPM)，quantumspinHallinsulatorandbandinsulator，willappearInthesecondchapter，fromDrudef

8、ormula，thelocalizationconditionofweakscatteringtheoryhasbeenderivedTherealsoexistAndersonlocationtheoryofdisordersystemandtheconditionofAndersondisordermodelTheend，thedevelopmentofAndersontransition，randomdisorder，bonddi

9、sorderandAndersontopologicalinsulatorareshownInthelastchapter，spintransportpropertiesofspin—separatedevicesaboutsilicenchavebeenanalyzedanddiscussedsystematicallybynumericalcalculationKEYWARDS：siliceneQSHVPMspincurrentsp