A5052554493- Graphene research and applications
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- 2D Materials and Applications
- Magnetic properties of thin films
- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Rare-earth and actinide compounds
- Theoretical and Computational Physics
- Carbon Nanotubes in Composites
- Advanced Chemical Physics Studies
- Surface and Thin Film Phenomena
- Molecular Junctions and Nanostructures
- Quantum many-body systems
- Iron-based superconductors research
- High-pressure geophysics and materials
- Plasmonic and Surface Plasmon Research
- Boron and Carbon Nanomaterials Research
- Heusler alloys: electronic and magnetic properties
- MXene and MAX Phase Materials
- Quantum Mechanics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Evolutionary Game Theory and Cooperation
- Magnetism in coordination complexes
Radboud University Nijmegen
2016-2025
Radboud Institute for Molecular Life Sciences
2016-2025
Radboud University Medical Center
2016-2025
National Renewable Energy Laboratory
2022-2023
Tsinghua University
2023
Columbia University
2023
University of Washington
2023
The London College
2023
King's College London
2022
Ural Federal University
2014-2021
Graphene - a monolayer of carbon atoms densely packed into hexagonal lattice has one the strongest possible atomic bonds and can be viewed as robust atomic-scale scaffold, to which other chemical species attached without destroying it. This notion graphene giant flat molecule that altered chemically is supported by observation so-called oxide, covered with hydroxyl groups. Unfortunately, oxide strongly disordered, poorly conductive difficult reduce original state. Nevertheless, imagine or...
We have studied temperature dependences of electron transport in graphene and its bilayer found extremely low electron-phonon scattering rates that set the fundamental limit on possible charge carrier mobilities at room temperature. Our measurements show higher than 200 000 cm2/V s are achievable, if extrinsic disorder is eliminated. A sharp (thresholdlike) increase resistivity observed above approximately K unexpected but can qualitatively be understood within a model rippled sheet which...
We present the science and technology roadmap for graphene, related two-dimensional crystals, hybrid systems, targeting an evolution in technology, that might lead to impacts benefits reaching into most areas of society. This was developed within framework European Graphene Flagship outlines main targets research as best understood at start this ambitious project. provide overview key aspects graphene materials (GRMs), ranging from fundamental challenges a variety applications large number...
We report a bipolar field effect tunneling transistor that exploits to advantage the low density of states in graphene and its one atomic layer thickness. Our proof-of-concept devices are heterostructures with atomically thin boron nitride acting as tunnel barrier. They exhibit room temperature switching ratios ~50, value can be enhanced further by optimizing device structure. These have potential for high frequency operation large scale integration.
We report on transport characteristics of quantum dot devices etched entirely in graphene. At large sizes, they behave as conventional single-electron transistors, exhibiting periodic Coulomb blockade peaks. For dots smaller than 100 nm, the peaks become strongly non-periodic indicating a major contribution confinement. Random peak spacing and its statistics are well described by theory chaotic neutrino (Dirac) billiards. Short constrictions only few nm width remain conductive reveal...
Carbon is one of the most intriguing elements in Periodic Table. It forms many allotropes, some known from ancient times (diamond and graphite) discovered 10-20 years ago (fullerenes nanotubes). Interestingly, two-dimensional form (graphene) was only obtained very recently, immediately attracting a great deal attention. Electrons graphene, obeying linear dispersion relation, behave like massless relativistic particles. This results observation number peculiar electronic properties – an...
We report a stoichiometric derivative of graphene with fluorine atom attached to each carbon. Raman, optical, structural, micromechanical and transport studies show that the material is qualitatively different from known graphene-based nonstoichiometric derivatives. Fluorographene high-quality insulator (resistivity >10^12 Ohm per square) an optical gap 3 eV. It inherits mechanical strength graphene, exhibiting Young's modulus 100 N/m sustaining strains 15%. inert stable up 400C even in air,...
Graphene is considered as one of the most promising materials for post silicon electronics, it combines high electron mobility with atomic thickness [Novoselov et al. Science 2004, 306, 666-669. Novoselov Proc. Natl. Acad. Sci. U.S.A. 2005, 102, 10451-10453]. The possibility chemical doping and related excellent sensor properties graphene have been demonstrated experimentally [Schedin Nat. Mater. 2007, 6, 652-655], but a microscopic understanding these effects has lacking, so far. In this...
A review of new developments in theoretical and experimental electronic-structure investigations half-metallic ferromagnets (HMFs) is presented. Being semiconductors for one spin projection metals another, these substances are promising magnetic materials applications spintronics (i.e., spin-dependent electronics). Classification HMFs by the peculiarities their electronic structure chemical bonding discussed. The effects electron-magnon interaction manifestations magnetic, spectral,...
We investigate the electronic properties of ultrathin hexagonal boron nitride (h-BN) crystalline layers with different conducting materials (graphite, graphene, and gold) on either side barrier layer. The tunnel current depends exponentially number h-BN atomic layers, down to a monolayer thickness. Conductive force microscopy scans across terraces thickness reveal high level uniformity in current. Our results demonstrate that atomically thin acts as defect-free dielectric breakdown field. It...
Magnetic zigzag edges of graphene are considered as a basis for novel spintronics devices despite the fact that no true long-range magnetic order is possible in one dimension. We study transverse and longitudinal fluctuations moments at from first principles. find high value spin wave stiffness $D=2100\text{ }\text{ }\mathrm{meV}\text{ }{\AA{}}^{2}$ spin-collinear domain wall creation energy ${E}_{\mathrm{dw}}=114\text{ }\mathrm{meV}$ accompanied by low anisotropy. Above crossover...
Based on density functional calculations, optimized structures of graphite oxide are found for various coverages by oxygen and hydroxyl groups, as well their ratio corresponding to the minimum total energy. The model proposed describes well-known experimental results. In particular, it explains why is so difficult reduce up pure graphene. Evolution electronic structure with coverage change investigated.
The properties of suspended graphene are currently attracting enormous interest, but the small size available samples and difficulties in making them severely restrict number experimental techniques that can be used to study optical, mechanical, electronic, thermal, other characteristics this one-atom-thick material. Here, we describe a new highly reliable approach for membranes macroscopic (currently up 100 μm diameter) their characterization by transmission electron microscopy. In...
By performing ab initio calculations for one- to four-layer black phosphorus within the $GW$ approximation, we obtain a significant difference in band gap ($\ensuremath{\sim}$1.5 eV), which is line with recent experimental data. The results are analyzed terms of constructed four-band tight-binding model, gives accurate descriptions mono- and bilayer structure near gap, reveal an important role interlayer hoppings, largely responsible obtained difference.
We discuss various scattering mechanisms for Dirac fermions in single-layer graphene. It is shown that on a short-range potential (e.g. due to neutral impurities) mostly irrelevant electronic quality of graphene, which likely be controlled by charged impurities and ripples (microscopic corrugations graphene sheet). The latter are an inherent feature its two-dimensional nature can also important factor defining the electron mean-free path. show certain types create long-range potential,...