Suppression of intervalley exchange coupling in the presence of momentum-dark states in transition metal dichalcogenides
Malte Selig, Florian Katsch, Samuel Brem, Garnik F. Mkrtchian, Ermin Malic, Andreas Knorr
Abstract
The authors present a microscopic theory for the spin relaxation of optically excited excitons through exchange coupling in monolayers of transition metal dichalcogenides. The authors demonstrate that the appearance of energetically low lying dark states leads to a significant elongation of the spin polarization lifetime in comparison to scenarios where these states are absent
Topics & Concepts
Condensed matter physicsTransition metalExcited stateExcitonCoupling (piping)Materials sciencePolarization (electrochemistry)MonolayerRelaxation (psychology)PhysicsExchange interactionSpin polarizationSpin (aerodynamics)Spin statesFerromagnetismMolecular physicsMetalChemistryAtomic physicsCoupling strengthElongation2D Materials and ApplicationsPhotochromic and Fluorescence ChemistryPhotoreceptor and optogenetics research