Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit

作     者：Ankur Sharma Linglong Zhang Jonathan O.Tollerud Miheng Dong Yi Zhu Robert Halbich Tobias Vogl Kun Liang Hieu T.Nguyen Fan Wang Shilpa Sanwlani Stuart K.Earl Daniel Macdonald Ping Koy Lam Jeffrey A.Davis Yuerui Lu Ankur Sharma;Linglong Zhang;Jonathan O.Tollerud;Miheng Dong;Yi Zhu;Robert Halbich;Tobias Vogl;Kun Liang;Hieu T.Nguyen;Fan Wang;Shilpa Sanwlani;Stuart K.Earl;Daniel Macdonald;Ping Koy Lam;Jeffrey A.Davis;Yuerui Lu

作者机构：Research School of ElectricalEnergy and Materials EngineeringCollege of Engineering and Computer ScienceThe Australian National UniversityCanberraACT 2601Australia Optical Sciences CentreSwinburne University of TechnologyHawthornVIC 3122Australia ARC Centre of Excellence for Future Low-Energy Electronics TechnologyAustralia Centre for Quantum Computation and Communication TechnologyDepartment of Quantum ScienceResearch School of Physics and EngineeringThe Australian National UniversityActonACT 2601Australia School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing 100081China Institute for Biomedical Materials and Devices(IBMD)Faculty of ScienceUniversity of Technology SydneySydneyNSW 2007Australia 

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

年 卷 期：2020年第9卷第1期

页      面：907-919页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：funding support from ANU PhD student scholarship,China Scholarship Council,Australian Research Council(ARC,numbers DE140100805 and DP180103238) ARC Centre of Excellence in Future Low-Energy Electronics Technologies(project number CE170100039) ARC Centre of Excellence in Quantum Computation and Communication Technology(project number CE170100012) 

主　　题：transport quantum coherent 

摘      要：Long-range and fast transport of coherent excitons is important for the development of high-speed excitonic circuits and quantum computing ***,most of these coherent excitons have only been observed in some low-dimensional semiconductors when coupled with cavities,as there are large inhomogeneous broadening and dephasing effects on the transport of excitons in their native states in ***,by confining coherent excitons at the 2D quantum limit,we first observed molecular aggregation-enabled‘supertransport’of excitons in atomically thin two-dimensional(2D)organic semiconductors between coherent states,with a measured high effective exciton diffusion coefficient of ~346.9 cm^(2)/s at room *** value is one to several orders of magnitude higher than the values reported for other organic molecular aggregates and low-dimensional inorganic *** coupling to any optical cavities,the monolayer pentacene sample,a very clean 2D quantum system(~1.2 nm thick)with high crystallinity(J-type aggregation)and minimal interfacial states,showed superradiant emission from Frenkel excitons,which was experimentally confirmed by the temperature-dependent photoluminescence(PL)emission,highly enhanced radiative decay rate,significantly narrowed PL peak width and strongly directional in-plane *** coherence in monolayer pentacene samples was observed to be delocalised over~135 molecules,which is significantly larger than the values(a few molecules)observed for other organic thin *** addition,the supertransport of excitons in monolayer pentacene samples showed highly anisotropic *** results pave the way for the development of future high-speed excitonic circuits,fast OLEDs,and other optoelectronic devices.