Quantum-dot-like states in molybdenum disulfide nanostructures due to the interplay of local surface wrinkling, strain, and dielectric confinement

Abstract

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 excited charge-carrier localization has been linked to defects and strain, while open questions remain regarding the microscopic origin. We demonstrate that the bending rigidity of these materials leads to wrinkling of the two-dimensional layer. The resulting strain field facilitates strong carrier localization due to its pronounced influence on the band gap. Additionally, we consider charge carrier confinement due to 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 on substrates or other two-dimensional materials.

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Cited by in corpus (13)

• Imaging strain-localized exciton states in nanoscale bubbles in monolayer WSe2 at room temperature
• Exciton optics, dynamics and transport in atomically thin semiconductors
• Strain-dependent exciton diffusion in transition metal dichalcogenides
• Dark-exciton driven energy funneling into dielectric inhomogeneities in two-dimensional semiconductors
• Ultra Localized Optoelectronic Properties of Nanobubbles in 2D Semiconductors
• Optical properties of exciton in two-dimensional transition metal dichalcogenide nanobubbles
• Electronic Properties of Defective MoS${}_2$ Monolayers Subject to Mechanical Deformations: A First-Principles Approach
• Curvature-enhanced localised emission from dark states in wrinkled monolayer WSe2 at room temperature
• Electron dynamics in a 2D nanobubble: A two-level system based on spatial density
• Two dimensional semiconductors: optical and electronic properties
• Phonon-mediated exciton capture in Mo-based transition metal dichalcogenides
• Nanoparticle Stressor-Induced Single-photon Sources in Monolayer WS${}_2$ Emitting into a Narrowband Visible Spectral Range
• Polariton transport in 2D semiconductors: Phonon-mediated transitions between ballistic, superdiffusive and exciton-limited regimes