Publications by authors named "Alexander J H van der Torren"
The two-dimensional electron liquid which forms between the band insulators LaAlO (LAO) and SrTiO (STO) is a promising component for oxide electronics, but the requirement of using single crystal SrTiO substrates for the growth limits its applications in terms of device fabrication. It is therefore important to find ways to deposit these materials on other substrates, preferably Si, or Si-based, in order to facilitate integration with existing technology. Interesting candidates are micron-sized nanosheets of CaNbO which can be used as seed layers for perovskite materials on any substrate.
View Article and Find Full Text PDFWe elucidated the formation process for Ruddlesden-Popper-type defects during pulsed laser deposition of Sr rich SrTiO thin films by a combined analysis of in-situ atomic force microscopy, low energy electron diffraction and high resolution scanning transmission electron microscopy. At the early growth stage of 1.5 unit cells, the excess Sr results in the formation of SrO on the surface, resulting in a local termination change from TiO to SrO, thereby forming a Sr rich (2 × 2) surface reconstruction.
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- High electron mobility is a crucial property of graphene, especially in its heterostructures with hexagonal boron nitride, widely used in research and applications.
- Despite the common assumption that the electronic states in these layered systems do not couple significantly, this study reveals that graphene and boron nitride bands show no interaction across a broad energy range.
- The angle-resolved reflected-electron spectroscopy method we utilized can be applied to investigate interactions in other van der Waals layered materials, enhancing our understanding of how electronic coupling contributes to the creation of novel materials.