Optical memory development in bidimensional heterosctructures

• Grant number: 25/24550-7
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: December 01, 2025
• End date: July 31, 2028
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Marcio Daldin Teodoro
• Grantee: Alessandra Ames
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated research grant: 25/02343-0 - Memory effect in two-dimensional TMD/phyllosilicate-based heterostructures, AP.R

Abstract

The study of materials exhibiting lamellar characteristics that can be isolated into monolayers is becoming increasingly relevant due to their unique properties, which have been extensively reported in the literature. Transition metal dichalcogenides (TMDs), belonging to the group of lamellar materials, are of interest for the fabrication of devices through so-called van der Waals heterostructures (vdWHs). This stems from the fact that TMD monolayers are susceptible to local defects, charge transfer with the substrate, and substrate roughness, and are generally encapsulated by insulating and atomically flat materials, such as hexagonal boron nitride (hBN). Due to the factors mentioned above, photoluminescence (PL) emissions, considered intense in TMDs, can be modulated by external factors, such as electric and magnetic fields and specific properties of some substrates. Considering the need to optimize devices and expand the list of suitable insulators for vdWHs, which is limited, this work aims to characterize the effects of a clinochlore substrate, a lamellar phyllosilicate, on the optical responses of a device containing a molybdenum diselenide (MoSe2) monolayer covered with an hBN layer. To achive that, optoelectronic studies will be carried out at cryogenic temperatures as a function of the application of an external electric field, external magnetic field, and variation of the excitation energy, in addition to non-linear optics studies, in order to investigate the recently proposed mem-emitters.