Pt薄膜衬底H堆叠 WS2/WSe2 层间激子的谷极化研究

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关键词:H堆叠 WS2/WSe2 ;层间激子;光致发光光谱;谷极化中图分类号: O472+.3 (2 文献标志码:A 文章编号:0253-2395(2025)04-0759-08

Abstract:Two-dimensionaltransitionmetaldichalcogenides(TMDCs)canformperiodicmoirésuperlatice,offeringaninvaluable platformfortheinvestigatioofelectroncorelationstatesndnovelexitonstates.MoiréiterlaerexcitosiMDCshterostruc tures with type-Ibandaignmentexhibitspin-vallyegreesoffreedomtataremanipulatednotonlybyelectrostaticfeld,ain, andsubstrateutalsobythemodulationofmoirépotential,fciliatingthexploratinofghlynablevalleytronicdvice.Itis paper,a H-stacked ( 60∘ twisted) tungsten disulfide/tungsten diselenide ( WS2/WSe2 )heterostructure was prepared on platinum (Pt) thin film substrate and silicon dioxide ( SiO2⋅ substrate,separately.By performing photoluminescence (PL) spectroscopy, photoluminescenceexcitation(PLE)spectroscopyandvleypolarzationmeasurementsonbothsubstratesatlowtemperatures,itwasobservedthat,intheabsenceofsignificantchargedoping,theinterlayerexcitonsare morelocalizedonthePtsubstrate.Additionaly thevaleypolarationismoreeasilysaturatedwithinreasingexcitonconcentrationonPtsubstrate.Ptinfis,ervingdualroles asmetalcontactsandartiallyintroduceddefects,esontoimpacttevalleypoarzatiooftheiterlayrexciosOurork provides insights for optoelectronics applications based onMoiré interlayer excitons. Key words: H-stacked WS2/WSe2 interlayer excitons; photoluminescence spectroscopy; valley polarization

0 引言

对以单层二硫化钨( WS2 ),二硒化钨( WSe2 )为代表的不同种过渡金属硫族化合物(TMDCs)进行晶格对齐的堆叠操作,由于晶格常数的失配,可以形成转角双层的莫尔超晶格结构[1-2]。(剩余15281字)

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