ORCID Profile
0000-0002-5415-326X
Current Organisation
SDU
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Publisher: American Association for the Advancement of Science (AAAS)
Date: 18-09-2020
Abstract: The rate of photon emission from a quantum dot can be controlled and speed up by over hundred times by applying a voltage.
Publisher: Wiley
Date: 24-09-2021
Abstract: Charge doping of materials with 2D and 3D quantum confinement is a flexible tool to tailor their excitonic emission. Here, using electron doping experiments on transition metal dichalcogenide (TMD) monolayers, reversible tuning of charged exciton emission within a redshift of up to 75 meV is demonstrated by applying very modest voltages (corresponding roughly to the band gap of TMDs), while also controlling the radiative lifetime and intensity. It is found that the neutral exciton ionization dynamics at increasing electron doping follows the Fermi–Dirac distribution, which allows to determine the size of the band gap as well as to extract experimental values for effective masses of electrons and holes at room temperature. The tunable excitonic emission, preserving coherence at room temperature, holds great promise for quantum technologies requiring deterministic coupling with integrated photonic and plasmonic devices.
Publisher: American Chemical Society (ACS)
Date: 29-03-2018
DOI: 10.1021/ACS.NANOLETT.8B00557
Abstract: Quantum emitters radiate light omni-directionally, making it hard to collect and use the generated photons. Here, we propose a three-dimensional metal-dielectric parabolic antenna surrounding an in idual quantum dot as a source of collimated single photons, which can then be easily extracted and manipulated. Our fabrication method relies on a single optically induced polymerization step once the selected emitter has been localized by confocal microscopy. Compared to conventional nanoantennas, our geometry does not require near-field coupling, and it is, therefore, very robust against misalignment issues and minimally affected by absorption in the metal. The parabolic antenna provides one of the largest reported experimental directivities ( D = 106) and the lowest beam ergences (Θ
Publisher: IOP Publishing
Date: 08-03-2023
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 (WS 2 ), 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 WS 2 monolayer allows for the synchronization of photon emitters in an ensemble, which is important to further advance light information and computing technologies.
Publisher: Walter de Gruyter GmbH
Date: 29-05-2023
Abstract: Impurity-vacancy centers in diamond offer a new class of robust photon sources with versatile quantum properties. While in idual color centers commonly act as single-photon sources, their ensembles have been theoretically predicted to have tunable photon-emission statistics. Importantly, the particular type of excitation affects the emission properties of a color center ensemble within a diamond crystal. While optical excitation favors non-synchronized excitation of color centers within an ensemble, electron-beam excitation can synchronize the emitters excitation and thereby provides a control of the second-order correlation function g 2 (0). In this letter, we demonstrate experimentally that the photon stream from an ensemble of color centers can exhibit g 2 (0) both above and below unity, thereby confirming long standing theoretical predictions by Meuret et al. [S. Meuret, L. H. G. Tizei, T. Cazimajou, et al., “Photon bunching in cathodoluminescence,” Phys. Rev. Lett. , vol. 114, no. 19, p. 197401, 2015.]. Such a photon source based on an ensemble of few color centers in a diamond crystal provides a highly tunable platform for informational technologies operating at room temperature.
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Sergii Morozov.