In situ spontaneous emission control of MoSe_(2)-WSe_(2)interlayer excitons with high quantum yield  

作　　者：BO HAN CHIRAG C.PALEKAR FREDERIK LOHOF SVEN STEPHAN VICTOR N.MITRYAKHIN JENS-CHRISTIAN DRAWER ALEXANDER STEINHOFF LUKAS LACKNER MARTIN SILIES BÁRBARA ROSA MARTIN ESMANN FALK EILENBERGER CHRISTOPHER GIES STEPHAN REITZENSTEIN CHRISTIAN SCHNEIDER 

机构地区：[1]Institut für Physik,Fakultät V,Carl von Ossietzky Universität Oldenburg,26129 Oldenburg,Germany 2Institut für Festkörperphysik,Technische Universität Berlin,10623 Berlin,Germany 3Institute for Theoretical Physics and Bremen Center for Computational Material Science,Universität Bremen,28359 Bremen,Germany 4Institute for Lasers and Optics,Hochschule Emden/Leer,26723 Emden,Germany 5Fraunhofer-Institute for Applied Optics and Precision Engineering IOF,07745 Jena,Germany 6Institute of Applied Physics,Abbe Center of Photonics,Friedrich Schiller Universität Jena,07745 Jena,Germany 7Max Planck School of Photonics,07745 Jena,Germany

出　　处：《Photonics Research》2025年第1期210-224,共15页光子学研究(英文版)

基　　金：Deutsche Forschungsgemeinschaft(Schn1376/14-1,Re2974/26-1,Gi1121/4-1,INST184/220-1 FUGG);European Union’s Horizon 2020(101017733);NFSC(12304012)。

摘　　要：Optical resonators are a powerful platform to control the spontaneous emission dynamics of excitons in solidstate nanostructures.We study a MoSe_(2)-WSe_(2)heterostructure that is integrated in a cryogenic open optical microcavity to gain insights into fundamental optical properties of the emergent interlayer excitons.First,we utilize a low-quality-factor planar open cavity and investigate the modification of the excitonic lifetime as on-and offresonance conditions are met with consecutive longitudinal modes.Time-resolved photoluminescence measurements revealed a periodic tuning of the interlayer exciton lifetime by 220 ps,which allows us to extract a 0.5 ns free-space radiative lifetime and a quantum efficiency as high as 81.4%±1.4%.We subsequently engineer the local density of optical states by spatially confined and spectrally tunable Tamm-plasmon resonances.The dramatic redistribution of the local optical modes allows us to encounter a significant inhibition of the excitonic spontaneous emission rate by a factor of 3.2.Our open cavity is able to tune the cavity resonances accurately to the emitters to have a robust in situ control of the light-matter coupling.Such a powerful characterization approach can be universally applied to tune the exciton dynamics and measure the quantum efficiencies of more complex van der Waals heterostructures and devices.

关 键 词：tuning QUANTUM INTERLAYER 

分 类 号：O469[理学—凝聚态物理]