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石墨烯光学介绍.ppt

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OpticsonGraphene

Gate-VariableOpticalTransitionsinGrapheneDirectObservationofaWidelyTunableBandgapinBilayerGrapheneFengWang,YuanboZhang,ChuanshanTian,CaglarGirit,AlexZettl,MichaelCrommie,andY.RonShen,Science320,206(2008).YuanboZhang,Tsung-TaTang,CaglarGirit1,ZhaoHao,MichaelC.Martin,AlexZettl1,MichaelF.Crommie,Y.RonShenandFengWang(2009)1234

Graphene

(AMonolayerofGraphite)2DHexagonallattice

Electrically:Highmobilityatroomtemperature,LargecurrentcarryingcapabilityMechanically:LargeYoung’smodulus.Thermally:Highthermalconductance.PropertiesofGraphene

QuantumHalleffect,01BarryPhase02Ballistictransport,03Kleinparadox04Others05ExoticBehaviors

QuantumHallEffectY.Zhangetal,Nature438,201(2005)

OpticalStudiesofGrapheneOpticalmicroscopycontrast;Ramanspectroscopy;Landaulevelspectroscopy.OtherPossibilitesSpectroscopicprobeofelectronicstructure.Interlayercouplingeffect.Electricalgatingeffectonopticaltransitions.Others

CrystallineStructureofGraphite

Graphene2DHexagonallattice

BandStructureofGrapheneMonolayer,Phys.Rev.71,622-634(1947)

BandStructureofMonolayerGraphere

ElectronBandsofGrapheneMonolayer

BandStructureinExtendedBZ

RelativisticDiracfermion.BandStructurenearKPoints~10eV

VerticalopticaltransitionVanHoveSingularityKKMonolayerBilayerBandStructuresofGrapheneMonolayerandBilayernearKEFisadjustablexx

ExfoliatedGraphene

MonolayersandBilayersMonolayerBilayerReflectingmicroscopeimages.20?m

RamanSpectroscopyofGraphene,etal,PRL97,187401(2006)(AllowingIDofmonolayerandbilayer)

ReflectionSpectroscopy

onGraphene

ExperimentalArrangementDopedSiGrapheneGold290-nmSilicaOPADet

InfraredReflectionSpectroscopy

toDeduceAbsorptionSpectrumDifferentialreflectionspectroscopy:DifferencebetweenbaresubstrateandgrapheneonsubstrateAB-dR/R?(RA-RB)/RAversuswRA:baresubstratereflectivityRB:subs

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