Probing Charge Accumulation at SrMnO<sub>3</sub>/SrTiO<sub>3</sub> Heterointerfaces via Advanced Electron Microscopy and Spectroscopy
Hongguang Wang, Vesna Šrot, Xijie Jiang, Min Yi, Yì Wáng, Hans Boschker, Rotraut Merkle, Robert W. Stark, J. Mannhart, Peter A. van Aken
Abstract
/unit cell (uc) at the first SMO monolayer. Based on quantitative atomic-scale STEM analyses and first-principle calculations, we explore the origin of interfacial charge accumulation in terms of epitaxial strain-favored oxygen vacancies, cationic interdiffusion, interfacial charge transfer, and space-charge effects. This study, therefore, provides a comprehensive description of the charge distribution and related mechanisms at the SMO/STO heterointerfaces, which is beneficial for the functionality manipulation via charge engineering at interfaces.
Topics & Concepts
Chemical physicsScanning transmission electron microscopyCharge densityMaterials scienceCharge (physics)HeterojunctionTransmission electron microscopySpectroscopySpace chargeAtomic unitsNanotechnologyElectronChemistryOptoelectronicsPhysicsQuantum mechanicsElectronic and Structural Properties of OxidesMagnetic and transport properties of perovskites and related materialsMultiferroics and related materials