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1、Articlewww.acsnano.orgTransportDynamicsofNeutralExcitonsandTrionsinMonolayerWS2ToshiakiKato*andToshiroKanekoDepartmentofElectronicEngineering,TohokuUniversity,980-8579Sendai,Japan*SSupportingInformationABSTRACT:Understandingthespatialmotionofexcitonsisof
2、bothfundamentalinterestandcentralimportanceforoptoelectricalapplications.Here,wehaveinvestigatedthetemperature(T)dependenceofthetransportdynamicsofneutralexcitonsandchargedexcitons(trions)inatomicallythintwo-dimensionalcrystalsofthetransition-metaldichal
3、cogenideWS2.Thetransportdynamicsofneutralexcitonscanbedividedintothreetemperatureranges,wherethediffusionofneutralexcitonsisgovernedbythermalactivation(≤∼75K),ionizedimpurityscattering(∼75K≤T≤∼200K),andLOphononscattering(≥∼200K).Thetrionshaveadiffusionleng
4、ththatisover20timeslongerthanthatofneutralexcitonsatverylowtemper-atures(≤∼10K),whichmayberelatedtotheoreticallypredictedPauli-blockingeffectsduringtheexcitationprocess.KEYWORDS:excitons,transportdynamics,WS2,photoluminescence,temperaturedependencexcitons
5、,i.e.,electron−holepairscoupledviaCoulombimportantsubjectforunderstandingthebehaviorofexcitons,attraction,arebosonicquasiparticlesthatplayacrucialisstillunclear.Zhaoetal.reportedtheexcitondiffusionofEroleinvariousoptoelectricalsciencesandapplica-TMDswitht
6、ransientabsorptionmicroscopyatroomtemper-1−3ature,22,23butthediffusiondynamicsoftheexcitonsoverations.BecausethebehaviorofexcitonsissensitivetotheratiooftheexcitonBohrradius(typicallyafewnanometers)towidetemperature(T)rangehavenotbeenclarified.Under-thecry
7、stalthickness,low-dimensionalmaterials(smallerthanstandingthetransportdynamicsofelectrical(electronandtheexcitonBohrradius)canbeexpectedtoexhibitvarioushole)andopticallygenerated(excitons)carriersisveryoutstandingoptoelectricalfeatures.Fromahistoricalpoi
8、ntofimportanttofullyutilizethepotentialofTMDsinview,thesequantumconfinedeffectswerefirstinvestigatedoptoelectricalapplications.Thetransportdynamicsofelectricalwithquasi-two-dimensional(quasi-2D)(GaAs/GaAlAs)andcarrierssuchase
