Theory of moiré localized excitons in transition metal dichalcogenide heterobilayers
David A. Ruiz‐Tijerina, Isaac Soltero, Francisco Mireles
Abstract
Excitons in transition metal dichalcogenide heterostructures experience a periodic moir\'e potential, featuring deep wells with trigonal (${C}_{3v}$) symmetry. This paper studies the localization of interlayer excitons at these potential wells and the influence of the localized state's symmetry on the optical selection rules. Degenerate doublets from the symmetry group's $E$ representation are found to dominate the optical response in the localized state sector. The authors discuss how these bright excitons respond to external perturbations, laying the groundwork for controlling their optical response.
Topics & Concepts
ExcitonCondensed matter physicsDegenerate energy levelsSymmetry (geometry)HeterojunctionTransition metalMoiré patternTrigonal crystal systemMaterials sciencePhysicsChemistryOpticsQuantum mechanicsCrystallographyMathematicsGeometryCrystal structureCatalysisBiochemistry2D Materials and ApplicationsPerovskite Materials and ApplicationsLuminescence and Fluorescent Materials