Radiative suppression of exciton-exciton annihilation in a two-dimensional semiconductor

作     者：Luca Sortino Merve Gülmüs Benjamin Tilmann Leonardo de S.Menezes Stefan A.Maier Luca Sortino;Merve Gülmüs;Benjamin Tilmannr;Leonardo de S.Menezes;Stefan A.Maier

作者机构：Chair in Hybrid NanosystemsNanoinstitute MunichFaculty of PhysicsLudwig-Maximilians-Universität München80539 MunichGermany Center for NanoScienceFaculty of PhysicsLudwig-Maximilians-Universität München80539 MunichGermany Departamento de FísicaUniversidade Federal de Pernambuco50670-901 Recife-PEBrazil School of Physics and AstronomyMonash UniversityClaytonVIC 3800Australia The Blackett LaboratoryDepartment of PhysicsImperial College LondonLondon SW72BWUK 

出 版 物：《Light(Science & Applications)》 (光(科学与应用(英文版))

年 卷 期：2023年第12卷第9期

页      面：1911-1920页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：S.A.M.acknowledges the Lee Lucas chair in physics and funding by the EPSRC(EP/WO1707511) the Australian Research Council(Centre of Excellence in Future Low-Energy Electronics Technologies-CE 170100039) L.S.further acknowledges funding support through a Humboldt Research Fellowship from the Alexander von Humboldt Foundation Our studies were partially supported by the Center for NanoScience(CeNS)-Faculty of Physics,Ludwig-Maximilians University Munich. 

主　　题：annihilation dielectric coupling 

摘      要：Two-dimensional(2D)semiconductors possess strongly bound excitons,opening novel opportunities for engineering light-matter interaction at the nanoscale.However,their in-plane confinement leads to large non-radiative exciton–exciton annihilation(EEA)processes,setting a fundamental limit for their photonic applications.In this work,we demonstrate suppression of EEA via enhancement of light-matter interaction in hybrid 2D semiconductor-dielectric nanophotonic platforms,by coupling excitons in WS2 monolayers with optical Mie resonances in dielectric nanoantennas.The hybrid system reaches an intermediate light-matter coupling regime,with photoluminescence enhancement factors up to 102.Probing the exciton ultrafast dynamics reveal suppressed EEA for coupled excitons,even under high exciton densities10^(12)cm^(−2).We extract EEA coefficients in the order of 10^(−3),compared to 10^(−2)for uncoupled monolayers,as well as a Purcell factor of 4.5.Our results highlight engineering the photonic environment as a route to achieve higher quantum efficiencies,for low-power hybrid devices,and larger exciton densities,towards strongly correlated excitonic phases in 2D semiconductors.