Interplay of many-body interaction and random disorder in 2D materials*

Materials exhibiting strong electron-electron interactions and intrinsic disorder are gaining considerable interest due to their potential to enable and fine-tune exotic physical phenomena, including quantum phase transitions, magnetism, and pseudo-gapped metallic states. This is particularly pronounced in two-dimensional (2D) systems, where quantum confinement amplifies Coulomb interaction effects. In this work, we present our recent large-scale findings using the first-principles-based Typical Medium Dynamical Cluster Approximation (TMDCA), investigating the interplay between random native defects and Coulomb interactions in 2D GeS intercalated with organometallics. Our results demonstrate a remarkable enhancement and tunability of excitonic absorption, underscoring the potential of disorder as a tool to manipulate material properties [1].