2025-2026 Faculty Research Grant
Henry Navarro (Physics)
Shining Light on Interfaces: How Boundaries Control Advanced Materials.
This project investigates how ultra-thin interfaces between materials can tune the macroscopic properties of advanced materials systems. In particular, we focus on the class of materials, known as “strongly correlated oxides,” which can reversibly electrically transform from metallic solids (conductors) to insulating solids (dielectrics). The electronic characteristics of these materials can be converted between the two solid states upon the introduction of a thin light-sensitive layer. This process can appear to be as if a strongly imposed magnetic field had been applied to oxide, but more simply and with a larger tuning of the solid’s electronic behavior. We found surprising behavior at the interface; we are suggesting experiment design studies wherein the conductivity changes without a change in magnetism from the irradiation of light. Our project will pursue measurements and analysis of oxide–semiconductor heterostructures (e.g., LaSrMnO 3 , and CdS) through a series of studies wherein we apply variations of electron current, light, and temperature and continuous time measurements. These measurements will be evaluated against what models describe the electron current interaction at an interface. Ultimately, our end goal will be to build devices that respond to stimuli directions to mimic functioning brain neurons throughout the processes that initiate, switch, store, and process the brain's signal system. The implications of developing devices that appropriately switch, store, and process could be the development of low energy exhibiting electronics and smart ‘active’ sensors that switch and process like a brain.