A5017141841- Semiconductor Quantum Structures and Devices
- Quantum and electron transport phenomena
- Perovskite Materials and Applications
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Magnetic and Electromagnetic Effects
- Supramolecular Self-Assembly in Materials
- Crystallization and Solubility Studies
- Physics of Superconductivity and Magnetism
- X-ray Diffraction in Crystallography
- Spaceflight effects on biology
- Magnetic properties of thin films
- Luminescence and Fluorescent Materials
- GaN-based semiconductor devices and materials
- Porphyrin and Phthalocyanine Chemistry
- Semiconductor materials and devices
- Liquid Crystal Research Advancements
- Nanowire Synthesis and Applications
- ZnO doping and properties
- Graphene research and applications
- Molecular Junctions and Nanostructures
- Advancements in Semiconductor Devices and Circuit Design
- Magnetic and transport properties of perovskites and related materials
- MXene and MAX Phase Materials
Radboud University Nijmegen
2016-2025
University College London
2022
Radboud University Medical Center
2006-2017
Radboud Institute for Molecular Life Sciences
2017
High Magnetic Field Laboratory
2016
KU Leuven
2008-2009
University of Bonn
2009
Eindhoven University of Technology
2005-2009
Dutch Research Council
2009
Dutch Polymer Institute
2005-2008
Monolayer transition-metal dichalcogenides have recently emerged as possible candidates for valleytronic applications, the spin and valley pseudospin are directly coupled stabilized by a large splitting. The optical properties of these two-dimensional crystals dominated tightly bound electron-hole pairs (excitons) more complex quasiparticles such charged excitons (trions). Here we investigate monolayer WS2 samples via photoluminescence time-resolved Kerr rotation. In in energy-dependent...
In this review we will focus on how magnetic fields can be used to manipulate the motion of various micro- and nanostructures in solution. We distinguish between ferromagnetic, paramagnetic diamagnetic materials. Furthermore, use kinds fields, such as homogeneous, inhomogeneous rotating is discussed. To date most research has focused ferro- materials, but here also describe possibilities manipulation Since vast majority soft matter diamagnetic, paves way for many new applications nanostructures.
In heterostructures consisting of different transition-metal dichalcogenide monolayers, a staggered band alignment can occur, leading to rapid charge separation optically generated electron–hole pairs into opposite monolayers. These spatially separated are Coulomb-coupled and form interlayer excitons. Here, we study these excitons in heterostructure MoSe2 WSe2 monolayers using photoluminescence spectroscopy. We observe non-trivial temperature dependence the linewidth peak energy exciton,...
We report the direct observation of strong coupling between magnons and phonons in a two-dimensional antiferromagnetic semiconductor ${\mathrm{FePS}}_{3}$, via magneto-Raman spectroscopy at magnetic fields up to 30 Tesla. A Raman-active magnon $121\text{ }\text{ }{\mathrm{cm}}^{\ensuremath{-}1}$ is identified through Zeeman splitting an applied field. At field-driven resonance with nearby phonon mode, hybridized magnon-phonon quasiparticle formed due two modes. develop microscopic model...
Spontaneous formation of vesicles in both organic solvents and water is observed for new rod–coil-type diblock copolymers containing thiophene groups. The groups located the skin aggregates can couple to give polymerized (see picture cover picture). are capable including enzymes, which results catalytically active microreactors that permeable substrate molecules.
The use of bottom-up approaches to construct patterned surfaces for technological applications is appealing, but date applicable only relatively small areas (approximately 10 square micrometers). We constructed highly periodic patterns at macroscopic length scales, in the range millimeters, by combining self-assembly disk-like porphyrin dyes with physical dewetting phenomena. consisted equidistant 5-nanometer-wide lines spaced 0.5 1 micrometers apart, forming single stacks containing...
The photochemical coupling of olefin-capped (bio)molecules to surface-bound thiols can be used control protein immobilization on length scales centimeters sub-micrometers (see the fluorescence microscopy image a nanopattern after treatment with labeled streptavidin). Two enzymes immobilized resulting patterns retained their enzymatic activity and underwent protein–protein interactions similar those in solution phase. Supporting information for this article is available WWW under...
A magnetic field has been utilized for producing highly oriented films of a substituted hexabenzocoronene (HBC). Optical microscopy studies revealed large area HBC monodomains that covered the entire film, while wide-angle X-ray measurements showed molecules are aligned with their planes along applied field. On basis this method, solution-processed field-effect transistors (FET) have constructed charge carrier mobilities up to 10(-3) cm2/V.s, which significantly enhanced respect unaligned...
Piggy-back porphyrins: The presence of a Lewis base remarkably affects the cooperative self-assembly zinc porphyrins. Driven by susceptibility monomer towards axial ligand, scavenging caused depolymerization porphyrin aggregates, and dilution aggregation re-entrant phase transition. Model predictions were validated experiments.
Monolayers of semiconducting transition metal dichalcogenides exhibit intriguing fundamental physics strongly coupled spin and valley degrees freedom for charge carriers. While the possibility exploiting these properties information processing stimulated concerted research activities towards concept valleytronics , maintaining control over spin-valley polarization proved challenging in individual monolayers. A promising alternative route explores type II band alignment artificial van der...
Transition-metal dichalcogenides can be easily produced as atomically thin sheets, exhibiting the possibility to optically polarize and read out valley pseudospin of extremely stable excitonic quasiparticles present in these 2D semiconductors. Here, we investigate a monolayer tungsten disulphide high magnetic fields up 30\,T via photoluminescence spectroscopy at low temperatures. The degeneracy is lifted for all optical features, particularly excitons, singlet triplet trions, which determine...
The optical properties of colloidal cesium lead halide perovskite (CsPbBr3) nanocrystals are examined by time-resolved and polarization-resolved spectroscopy in high magnetic fields up to 30 T. We unambiguously show that at cryogenic temperatures the emission is dominated recombination negatively charged excitons with radiative decay time 300 ps. additional long-lived emission, which shortens from 40 down 8 ns relative amplitude increases fields, evidences presence a dark exciton. evaluate...
We study the band-edge exciton fine structure and in particular its bright-dark splitting colloidal semiconductor nanocrystals by four different optical methods based on fluorescence line narrowing time-resolved measurements at various temperatures down to 2 K. demonstrate that all these provide consistent values discuss their advances limitations. Colloidal CdSe nanoplatelets with thicknesses of 3, 4 5 monolayers are chosen for experimental demonstrations. The excitons varies from 3.2 6.0...
We control the linear polarization of emission from coherently emitting K^{+} and K^{-} valleys (valley coherence) in monolayer WS_{2} with an out-of-plane magnetic field up to 25 T. The magnetic-field-induced valley Zeeman splitting causes a rotation respect excitation by 35° reduces degree 16%. explain both these phenomena model based on two noninteracting coherent two-level systems. deduce that light decays time constant τ_{c}=260 fs.
We investigate the magnetic-field-induced splitting of biexcitons in monolayer WS$_2$ using polarization-resolved photoluminescence spectroscopy out-of-plane magnetic fields up to 30 T. The observed $g$ factor biexciton amounts $-3.89$, closely matching neutral exciton. emission shows an inverted circular field-induced polarization upon linearly polarized excitation, i.e. it exhibits preferential from high-energy peak a field. This phenomenon is explained by taking into account configuration...
The fast-growing field of atomically thin semiconductors urges a new understanding two-dimensional excitons, which entirely determine their optical responses. Here, taking layered lead halide perovskites as an example unconventional semiconductors, by means versatile spectroscopy measurements, we resolve fine-structure splitting bright excitons up to ∼2 meV, is among the largest values in semiconducting systems. large attributed strong electron-hole exchange interaction perovskites, proven...
The excellent optoelectronic performance of lead halide perovskites has generated great interest in their fundamental properties. polar nature the perovskite lattice means that electron-lattice coupling is governed by Fröhlich interaction. Still, considerable ambiguity exists regarding phonon modes participate this crucial mechanism. Here, we use multiphonon Raman scattering and THz time-domain spectroscopy to investigate CsPbBr3. We identify a longitudinal optical mode dominates...
Two oligo(p-phenylenevinylene)−peptide hybrid amphiphiles have been synthesized using solid- and liquid-phase strategies. The amphiliphiles are composed of a π-conjugated oligo(p-phenylenevinylene) trimer (OPV) which is coupled at either glycinyl-alanyl-glycinyl-alanyl-glycine (GAGAG) silk-inspired β-sheet or glycinyl-alanyl-asparagyl-prolyl-asparagy-alanyl-alanyl-glycine (GANPNAAG) β-turn forming oligopeptide sequence. solid-phase strategy enables one to use longer peptides if strong acidic...