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HL: Fachverband Halbleiterphysik

HL 27: Two-dimensional Materials III (joint session HL/CPP)

HL 27.5: Vortrag

Mittwoch, 3. April 2019, 10:30–10:45, H36

Charge carrier localization in molybdenum disulfide nanobubbles due to the interplay of surface wrinkling, strain, and dielectric confinement — •Christian Carmesin, Michael Lorke, Matthias Florian, Daniel Erben, Tim O. Wehling, and Frank Jahnke — Institut für Theoretische Physik, Universität Bremen

The observation of quantum light emission from atomically thin transition metal dichalcogenides has opened a new field of applications for these material systems. The corresponding charge carrier localization has been linked to defects and strain, however open questions remain about the microscopic origin. We demonstrate that bending of two-dimensional layers leads to surface wrinkling due to bond deformation within the atomically thin sheet. The resulting strain-field facilitates strong charge carrier localization due to its pronounced influence on the band gap. Additionally, we consider confinement as a result of local changes of the dielectric environment and show that both effects contribute to modified electronic states and optical properties. The interplay of surface wrinkling, strain-induced confinement and local changes of the dielectric environment is demonstrated for the example of nanobubbles that form when monolayers are deposited either on substrates or other two-dimensional materials.