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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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