Studies in colors for transition metal oxides and excitons and their tunability using disorder and defects in magnets

YRLG Workshop: Correlation and Topology in magnetic materials, July 16th - 18th 2024

Swagata Acharya

Colors in several transition metal oxides have often been ascribed to presence of defects/vacancies over the decades. I will discuss results from our recent work that uses parameter free many body perturbative and exact local approaches to describe the excitonic absorptions and their spin components that determine the color for these materials and that defects/vacancies were wrongly held responsible for the same. In the same vein I will discuss the tunability of excitons and their spin states using disorder and defects in 2D magnets.

 

[1] S Acharya et al., npj 2D Materials and Applications 6 (1), 33 (2022)

[2] M Grzeszczyk et al., Advanced Materials, 2209513 (2023)

[3] F. Ruta et al., Nature Communications 14 (1), 8261 (2023)

[4] S Acharya et al,  Nature Communications 14 (1), 5565 (2023)