Tunable interlayer excitons and switchable interlayer trions via dynamic near-field cavity  

作　　者：Yeonjeong Koo Hyeongwoo Lee Tatiana Ivanova Ali Kefayati Vasili Perebeinos Ekaterina Khestanova Vasily Kravtsov Kyoung-Duck Park 

机构地区：[1]Department of Physics,Pohang University of Science and Technology(POSTECH),Pohang,37673,Republic of Korea [2]School of Physics and Engineering,ITMO University,Saint Petersburg,197101,Russia [3]Department of Electrical Engineering,University at Buffalo,New York,NY,14260,USA

出　　处：《Light(Science & Applications)》2023年第3期425-434,共10页光（科学与应用)（英文版）

基　　金：National Research Foundation of Korea(NRF)grant funded by the Korea government(MEST)(NRF-2020R1C1C1011301,2021R1A6A1A10042944,and NRF-2021R1A2C1008452);supported by the MSIT,Korea,under the ITRC support program(IITP-2022-RS-2022-00164799);IITP and supported by internal fund/grant of Electronics and Telecommunications Research Institute(ETRI)[21YB2100,Research on Device Technology of SiC-based Single Photon Sources for Quantum Cryptography];Samsung Science and Technology Foundation(SSTF-BA2102-05);COMPA funded by the MSIT(2023-22030003-30);Priority 2030 Federal Academic Leadership Program and the Ministry of Science and Higher Education of Russian Federation,goszadanie no.2019-1246.2D materials fabrication was funded by Russian Science Foundation,project 21-72-10100.V.P.acknowledges the support by the National Science Foundation under Grant No.2230727.

摘　　要：Emerging photo-induced excitonic processes in transition metal dichalcogenide(TMD)heterobilayers,e.g.,interplay of intra-and inter-layer excitons and conversion of excitons to trions,allow new opportunities for ultrathin hybrid photonic devices.However,with the associated large degree of spatial heterogeneity,understanding and controlling their complex competing interactions in TMD heterobilayers at the nanoscale remains a challenge.Here,we present an all-round dynamic control of interlayer-excitons and-trions in a WSe_(2)/Mo_(0.5 )W_(0.5) Se_(2) heterobilayer using multifunctional tip-enhanced photoluminescence(TEPL)spectroscopy with<20 nm spatial resolution.Specifically,we demonstrate the bandgap tunable interlayer excitons and the dynamic interconversion between interlayer-trions and-excitons,through the combinational tip-induced engineering of GPa-scale pressure and plasmonic hot electron injection,with simultaneous spectroscopic TEPL measurements.This unique nano-opto-electro-mechanical control approach provides new strategies for developing versatile nano-excitonic/trionic devices using TMD heterobilayers.

关 键 词：INTERLAYER DYNAMIC TUNABLE 

分 类 号：TN112[电子电信—物理电子学]