Electrical manipulation of the fine-structure splitting of WSe₂ quantum emitters

• Main Authors: Chakraborty, Chitraleema (Contributor), Jungwirth, Nicholas R. (Author), Fuchs, Gregory D. (Author), Vamivakas, A. Nick (Author)
• Other Authors: Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2019-01-31T14:14:56Z.
• Subjects: Article
• Online Access: Get fulltext

We report on the modulation of the fine-structure splitting of quantum-confined excitons in localized quantum emitters hosted by a monolayer transition metal dichalcogenide (TMDC). The monolayer TMDC, tungsten diselenide (WSe₂), is encapsulated in a van der Waals heterostructure which enables the application of an external electric field on the quantum-dot-like emitters hosted by the monolayer flake. The emitters exhibit quantum-confined Stark effect and a modulation in the fine-structure splitting (FSS) as a function of electric field. A maximum modulation of 1500μeV is observed in the FSS from the studied emitters. Finally, we measure the polarization response of the localized exciton emission as a function of electric field exhibiting strong circular polarization with decreasing fine-structure splitting, further confirming the suppression of the anisotropic electron-hole exchange interaction thats causes the FSS.
National Science Foundation (U.S.) (Grant EFMA-1542707)
National Science Foundation (U.S.) (Grant EFMA-1542707)
United States. Air Force Office of Scientific Research (Grant FA9550-16-1-0020))