A5065707552- Electronic and Structural Properties of Oxides
- Magnetic and transport properties of perovskites and related materials
- Topological Materials and Phenomena
- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Organic and Molecular Conductors Research
- Transition Metal Oxide Nanomaterials
- Acoustic Wave Resonator Technologies
- Rare-earth and actinide compounds
- Magnetic Properties of Alloys
- Iron-based superconductors research
- 2D Materials and Applications
- Ga2O3 and related materials
- Advanced Materials Characterization Techniques
- Diamond and Carbon-based Materials Research
- Catalysis and Oxidation Reactions
- Photorefractive and Nonlinear Optics
- Advancements in Solid Oxide Fuel Cells
- Physics of Superconductivity and Magnetism
University of Twente
2019-2025
Chan Heart Rhythm Institute
2021
Utrecht University
2020
${\mathrm{YbNi}}_{4}{\mathrm{P}}_{2}$ is the first known ferromagnetic metal showing a second-order quantum phase transition. Current theoretical understanding rules out criticality in centrosymmetric two- and three-dimensional (2D 3D) metals. Thus, studying electronic structure of prime fundamental importance. Using angle-resolved photoemission spectroscopy, we experimentally prove existence 1D Fermi surface contours. In addition, our results demonstrate that part made states higher...
BaBiO3 is an oxide perovskite with a wide variety of interesting properties. It was expected that the compound would behave like metal. However, experiments revealed not metallic, which started extensive debate about mechanism responsible for this insulating behavior. The two most important conjectures in are charge disproportionation Bi ion into 3+ and 5+ cations bond hybridization 6s O 2p orbitals. Both mechanisms induce breathing mode oxygen octahedra, experimentally observed single...
This work shows how itinerant electrons localize due to increased interactions across the Mott metal-insulator transition.
A topological insulating phase has theoretically been predicted for the thermodynamically unstable perovskite of YBiO$_{3}$. Here, it is shown that crystal structure Y-Bi-O system can be controlled by using a BaBiO$_{3}$ buffer layer. The film overcomes large lattice mismatch 12% with SrTiO$_{3}$ substrate forming rocksalt in between two structures. Depositing an YBiO$_{3}$ directly on gives fluorite structure. However, when deposited top layer correct and comparable constant, single...
The material BaBiO$_{3}$ is known for its insulating character. However, thin films, in the ultra-thin limit, metallicity expected because suggested to return undistorted cubic phase where oxygen octahedra breathing mode will be suppresse as reported recently. Here, we confirm influence of on size band gap. electronic properties a thickness series are studied using \textit{in-situ} scanning tunneling microscopy. We observe wide-gap ($E_\textrm{G}$~$>$ 1.2 V)...
The observation of structural distortions in complex oxides is becoming more important order to explain their macroscopic behavior. X-ray photoelectron diffraction an excellent technique study the crystal structure and potentially observe oxygen element-specific fashion. Its surface-sensitive character opens up possibility perform experiments on ultra-thin films without probing substrate underneath. For BaBiO3 thin films, for example recent experimental results point towards a suppression...
Structural coupling in oxide perovskite heterostructures provides a route for engineering electronic properties. Additionally, alternative crystal orientations, such as the [111] direction, offer an additional degree of freedom tuning these These concepts merge experimental realization [111]-oriented bilayer, which, assuming cubic structure, is theoretically predicted to exhibit Chern insulating phase due C3v symmetry. However, deviations from structure form distortions, Jahn-Teller break...
In the quest for topological insulators with large band gaps, heterostructures Rashba spin-orbit interactions come into play. Transition metal oxides heavy ions are especially interesting in this respect. We discuss design principles stacking oxide layers. Assuming a single layer two-dimensional electron gas (2DEG) on both interfaces as building block, insulating phase is present when negative coupling between 2DEGs exists. When multiple blocks, or three-dimensional insulator artificially...
A topological oxide insulator is not yet experimentally observed. However, it theoretically predicted to exist in the perovskite YBiO3, which paves way for further investigations into possible properties. In article no. 1800679, Rosa Luca Bouwmeester et al. show that by using a BaBiO3 buffer layer, Y–Bi–O system stabilizes its thermodynamically unstable phase instead of favorable fluorite structure. On background cover, high resolution scanning transmission electron microscope image...