Publications by authors named "Hartwin Peelaers"
The moiré potential in rotationally misfit two-dimensional (2D) heterostructures has been used to build artificial exciton and electron lattices, which have become platforms for realizing exotic electronic phases. Here, we demonstrate a different approach to create a superlattice potential in 2D crystals by using the near field of an array of polar molecules. A bilayer of titanyl phthalocyanine (TiOPc), consisting of alternating out-of-plane dipoles, is deposited on monolayer MoS.
View Article and Find Full Text PDFThe nanoscale moiré pattern formed at 2D transition-metal dichalcogenide crystal (TMDC) heterostructures provides periodic trapping sites for excitons, which is essential for realizing various exotic phases such as artificial exciton lattices, Bose-Einstein condensates, and exciton insulators. At organic molecule/TMDC heterostructures, similar periodic potentials can be formed via other degrees of freedom. Here, we utilize the structure deformability of a 2D molecular crystal as a degree of freedom to create a periodic nanoscale potential that can trap interlayer excitons (IXs).
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- The study uses first-principles calculations to explore the electronic properties, vibrational spectra, and electron mobility of β-GaO, a semiconductor material.
- The researchers calculate the electron-phonon scattering rate by applying a specialized model that considers the unique structure of β-GaO and examine the influence of ionized impurities like donor and acceptor defects on mobility.
- The findings indicate that at lower carrier densities, electron-phonon interactions predominantly affect mobility, while higher densities lead to increased compensation effects that reduce mobility, suggesting that observed high anisotropy in experiments likely stems from factors beyond the intrinsic properties of β-GaO.
Article Synopsis
- The study measures the dielectric function of mono- and few-layer MoS2 films, revealing that excitonic effects significantly influence the dielectric properties when the films are thinner than 5-7 layers.
- For films less than 5-7 layers, the dielectric function decreases with increasing layer number, but for thicker films, it increases, demonstrating a shift in behavior due to the strong excitonic effects in thin films.
- This research highlights a key difference from traditional materials, where dielectric functions are primarily influenced by band structures, and suggests potential applications in designing advanced photonic devices like metamaterials and light emitters.
An ab initio study of the formation and segregation energies of B and P doped and BP codoped silicon nanowires oriented along the [110] direction is performed for fully relaxed H-passivated wires with a diameter of 1.2 and 1.6 nm.
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