Magneto-Optical Properties of 2D Materials Modulated by Defects

• Grant number: 24/15969-1
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: November 01, 2025
• End date: October 31, 2028
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Gilmar Eugenio Marques
• Grantee: Frederico Barros de Sousa
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated research grant: 23/10905-2 - Magneto-polaron and non-linear Zeeman effect in 2D semiconductors, AP.R

Abstract

The transition metal dichalcogenide (TMD) monolayers are part of the family of van der Waals two-dimensional materials. Their novel semiconducting properties make them promising for the next generation of optoelectronic devices. Moreover, TMD monolayers show a circular light emission with valley selectively and a coupling in their spin and valley degrees of freedom. These features lead to a valley Zeeman splitting effect in these TMD monolayers, raising their potential for applications in spintronics. Moreover, in order to tune and enhance these optical phenomena, there is a great effort in the defect engineering of TMD monolayers. For instance, growth methods capable of introduce spin polarized transition metal atoms as substitutional defects in TMD monolayers have been recently developed. Theoretical calculations predicted a room-temperature ferromagnetic ordering for these doped TMD monolayers, which was further confirmed by experimental results. Vanadium-doped WS2 and WSe2 monolayers are amongst these TMD two-dimensional magnetic semiconductors. Thus, it is expected an enhanced valley Zeeman splitting in these materials due to their intrinsic magnetic response. Therefore, in this project our mainly goal is to investigate this valley Zeeman effect in vanadium-doped WS2 and WSe2 monolayers by circular polarized magneto-photoluminescence measurements at low-temperature.