Photon superbunching in cathodoluminescence of excitons in WS2 monolayer. (1st April 2023)

• Record Type: Journal Article
• Authors: Fiedler, Saskia; Morozov, Sergii; Iliushyn, Leonid; Boroviks, Sergejs; Thomaschewski, Martin; Wang, Jianfang; Booth, Timothy J; Stenger, Nicolas; Wolff, Christian; Mortensen, N Asger
• Is Part Of: 2D materials. Volume 10:Number 2(2023)
• Publication Date: 2023-04-01
• Subjects: photon superbunching -- cathodoluminescence -- electron-beam excitation -- transition metal dichalcogenide monolayer -- van der Waals heterostructures -- hexagonal boron nitride; Graphene -- Periodicals; Materials science -- Periodicals; Nanostructured materials -- Periodicals; 620.115
• DOI: 10.1088/2053-1583/acbf66
• Languages: English
• ISSNs: 2053-1583

Abstract

Abstract: Cathodoluminescence spectroscopy in conjunction with second-order auto-correlation measurements of g 2 ( τ ) allows to extensively study the synchronization of photon emitters in low-dimensional structures. Co-existing excitons in two-dimensional transition metal dichalcogenide monolayers provide a great source of identical photon emitters which can be simultaneously excited by an electron. Here, we demonstrate large photon bunching with g 2 ( 0 ) up to 156 ± 16 of a tungsten disulfide monolayer (WS2 ), exhibiting a strong dependence on the electron-beam current. To further improve the excitation synchronization and the electron-emitter interaction, we show exemplary that the careful selection of a simple and compact geometry—a thin, monocrystalline gold nanodisk—can be used to realize a record-high bunching g 2 ( 0 ) of up to 2152 ± 236 . This approach to control the electron excitation of excitons in a WS2 monolayer allows for the synchronization of photon emitters in an ensemble, which is important to further advance light information and computing technologies.