Speaker
Description
Single-photon emitters (SPEs) are fundamental for optical-based quantum technologies [1], however, high quality and practically usable SPEs require properties that are hard to realize in the lab. Ideal SPEs must have high purity, produce indistinguishable photons with high brightness and must be easily reproduceable and scalable. A potential avenue to achieve these properties is to use two-dimensional (2D) materials for this purpose. Recently, it has been shown that 2D-materials like hexagonal boron nitride (hBN) and transition metal dichalcogenides (TMDs) can host SPEs with the desired properties. Using defects by high temperature annealing and focused ion beam (FIB) irradiation, hBN produced high-purity single photons at room temperature [2]. In parallel, combining strain via nanoscale stressors and defects with electron beam irradiation also showed high purity single photon emission in tungsten diselenide (WSe2) [3].
In this work, we aim to deterministically create scalable SPEs. To do so, we electrostatically define them in monolayer WSe₂ using nanopatterned graphite screening gates. A graphite flake patterned with periodic 30 nm nanoholes is used to screen the electric field from a global back gate, allowing manipulation of the field at the WSe₂ layer and the creation of local minima that could trap charges over that 30nm diameter and activate emitters. After their fabrication, proper characterization techniques such as photoluminescence spectroscopy and Hanbury Brown Twiss interferometry will be used on our samples, both at room and cryogenic temperatures.
1- Sunny Gupta, Wenjing Wu, Shengxi Huang, and Boris I. Yakobson. The Journal of Physical Chemistry Letters 2023 14 (13), 3274-3284 DOI: 10.1021/acs.jpclett.2c03674
2- Grosso, G., Moon, H., Lienhard, B. et al. Tunable and high-purity room temperature single-photon emission from atomic defects in hexagonal boron nitride. Nat Commun 8, 705 (2017). https://doi.org/10.1038/s41467-017-00810-2
3- Parto, K., Azzam, S.I., Banerjee, K. et al. Defect and strain engineering of monolayer WSe2 enables site-controlled single-photon emission up to 150 K. Nat Commun 12, 3585 (2021). https://doi.org/10.1038/s41467-021-23709-5
| Keyword-1 | 2D Materials |
|---|---|
| Keyword-2 | Single Photon Emitter |
| Keyword-3 | micro-photoluminescence |