Brobdingnagian photon bunching in cathodoluminescence of excitons in WS$_2$ monolayer

• URL: http://arxiv.org/abs/2111.07596v4
• Date: Wed, 15 Feb 2023 11:29:09 GMT
• Title: Brobdingnagian photon bunching in cathodoluminescence of excitons in WS$_2$ monolayer
• Authors: Saskia Fiedler, Sergii Morozov, Leonid Iliushyn, Sergejs Boroviks, Martin Thomaschewski, Jianfang Wang, Timothy J. Booth, Nicolas Stenger, Christian Wolff, N. Asger Mortensen
• Abstract summary: Cathodoluminescence spectroscopy allows to extensively study the synchronization of quantum light sources. Co-existing excitons in two-dimensional transition metal dichalcogenide monolayers provide a great source of identical quantum emitters.
• Score: 1.478983298867432
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Cathodoluminescence spectroscopy in conjunction with second-order auto-correlation measurements of $g_2(\tau)$ allows to extensively study the synchronization of quantum light sources in low-dimensional structures. Co-existing excitons in two-dimensional transition metal dichalcogenide monolayers provide a great source of identical quantum emitters which can be simultaneously excited by an electron. In this article, we demonstrate large photon bunching with $g_2(0)$ up to $156\pm16$ of a tungsten disulfide monolayer, exhibiting a strong dependence on the electron-beam current density. 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 $2152\pm236$. This approach to control the electron excitation of excitons in a \ce{WS2} monolayer allows for the synchronization of quantum emitters in an ensemble, which is important to further advance quantum information processing and computing technologies.

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