167 zoekresultaten voor “electron” in de Publieke website
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Applications of AdS/CFT to strongly correlated matter: from numerics to experiments
What physics controls the properties of quantum matter, such as how electrons flow inside high-temperature superconductors? This question has captivated the physics community and industry for decades, in part due to the great technological potential such materials have, but also because they have resisted…
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Size effects in microstructured superconductors and quantum materials
We find ourselves in an era of transition, not just towards a more computing- and data-driven society but also away from unsustainable fossil fuels as an energy source.
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Deciphering fermionic matter: from holography to field theory
Promotor: K.E. Schalm, Co-promotor: S.S. Lee
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Sparsity-Based Algorithms for Inverse Problems
Inverse problems are problems where we want to estimate the values of certain parameters of a system given observations of the system. Such problems occur in several areas of science and engineering. Inverse problems are often ill-posed, which means that the observations of the system do not uniquely…
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Nano-scale Electronic Structure of Strongly Correlated Electron Systems
Promotie
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Insights from scanning tunneling microscopy experiments into correlated electron systems
Promotie
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Photosynthetic light reactions at the gold interface
Promotor: T.J. Aartsma, Co-promotor: R.N. Frese
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The electrochemical reduction of dioxygen and hydrogen peroxide by molecular copper catalysts
The electrochemical oxygen reduction reaction (ORR) is an essential half-reaction for the utilization of hydrogen as a sustainable fuel, via the conversion of hydrogen to electrons and protons facilitated by the ORR. In the most common fuel cells, the ORR is requires high loadings of non-abundant platinum…
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Towards photo-CIDNP MAS NMR as a generally applicable enhancement method
Promotores: Prof.dr. H.J.M. de Groot, Prof.dr. J. Matysik (Universitaet Leipzig)
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Probing Molecular Layers with Low-Energy Electrons
Promotie
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Nanodeeltjes – redox eiwit biohybriden
Kunstmatige fotosynthese heeft als doel om via chemische processen zonne-energie om te zettn in brandstof. Semi-kunstmatige fotosynthese is een hybride aanpak waarbij chemische maar ook biotechnologische processen worden gebruikt. Wij hebben als doel om een hybride systeem te ontwikkelen met behulp…
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Gold nanoparticle-peptide conjugates for biomedical applications
Despite the fact that gold nanoparticles (GNPs) are one of the most studied nanoparticles, there is still a necessity for new approaches allowing for effective protective coating to enable wider use of GNPs in biomedical applications.
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PhD Position: Computational Modeling of Auger Capture Rates
Wiskunde en Natuurwetenschappen, Leids Instituut voor Chemisch Onderzoek (LIC)
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Quantum dots in microcavities: From single spins to engineered quantum states of light
A single self-assembled semiconductor quantum dot in a high-finesse optical microcavity - the subject of this thesis - is an interesting quantum-mechanical system for future quantum applications. For instance, this system allows trapping of an extra electron and thus can serve as a spin quantum memory,…
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On topological properties of massless fermions in a magnetic field
Make more fluid: In condensed matter systems, electrons can acquire unusual properties from their interaction with the atomic lattice.
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Dancing with the Stars
This thesis develops a method for direction dependent calibration of the ionosphere in radio interferometric data.
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Applications of topology to Weyl semimetals and quantum computing
This thesis covers various applications of topology in condensed matter physics and quantum information.
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Putting a spin on it: amyloid aggregation from oligomers to fibrils
This thesis focuses on amyloid proteins, a class of proteins that convert into amyloid fibrils.
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Helder beeld van bacteriën
Een bacterie supersnel bevriezen, om de structuur van buiten en binnen natuurgetrouw in beeld te brengen. Hoogleraar Ultrastructuurbiologie Ariane Briegel kwam speciaal hiervoor naar Leiden: de Universiteit Leiden is een van de weinige instituten wereldwijd waar de benodigde apparatuur beschikbaar is.…
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Ariane Briegel in NRC Handelsblad over supermicroscoop
Een speciaal type microscoop jaagt momenteel een revolutie aan in de biologie: de cryo-elektronenmicroscoop. Twee van zulke giganten staan sinds 2011 op de Leidse Faculteit der Wiskunde en Natuurwetenschappen. Hoogleraar Ultrastructuurbiologie Ariane Briegel vertelt hierover in het NRC Handelsblad.
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Low energy electron transmission through layered materials and chiral organic films
Promotie
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Specifiek eiwit in de hoofdrol bij ziekte van Parkinson
Met elektronspins hebben natuurkundigen het bindingsproces onderzocht van het eiwit α-synucleïne, dat wordt geassocieerd met de ziekte van Parkinson. Wat blijkt is dat het eiwit op een verrassend efficiënte manier bindt aan een hersenmembraan. Met deze in Leiden ontwikkelde methode hebben de onderzoekers…
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PROGENY
How do you make a technology sustainable that does not even exist yet? Well, by bringing together an interdisciplinary team of pioneering European experts right at the start and paying attention to sustainability right from the development phase.
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Monitoring and detection of nanomaterials in biological media.
How do nanoparticles bioaccumulate and biodistribute in organisms?
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Using cryo-EM methods to uncover structure and function of bacteriophages
Bacteriophages, or phages for short, are the most abundant biological entity in nature. They shape bacterial communities and are a major driving force in bacterial evolution.
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Inducing spin triplet superconductivity in a ferromagnet
Promotor: J. Aarts
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On transport properties of Majorana fermions in superconductors: free & interacting
Majorana fermions in superconductors are the subgap quasiparticle excitations that are their own antiparticles.
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Nuclear magnetic resonance force microscopy at millikelvin temperatures
Promotor: T.H. Oosterkamp
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Reactivity of cobalt(II)-dichalcogenide complexes: correlation between redox conversion and ligand-field strength
The redox-conversion reaction of metal-disulfide and metal-thiolate complexes are important, as they may shed light on electron-transfer reactions that often occur in Nature.
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Photocatalytic redox reactions at the surface of liposomes
Promotor: Prof.dr. E. Bouwman, Co-promotor: S. Bonnet
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On electronic signatures of topological superconductivity
Promotor: Prof.dr. C.W.J. Beenakker
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The optimization and scale-up of the electrochemical reduction of CO₂ to formate
Carbon dioxide capture and utilization technologies are necessary to create a truly circular economy. The electrochemical reduction of carbon dioxide to formate is an appealing carbon utilization method as it can be performed at room temperature and pressure, it only requires two electrons, and it has…
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Magnetic imaging of spin waves and magnetic phase transitions with nitrogen-vacancy centers in diamond
The elementary excitations of magnets are called spin waves, and their corresponding quasi-particles are known as magnons. The rapidly growing field of Magnonics aims at using them as information carriers in a new generation of electronic devices, (almost) free of electric currents.
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Chemical functionalization of the graphene surface for electrical and electrochemical sensing application
Advanced sensing techniques require graphene with high quality and well-controlled surface chemistry.
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Network flow algorithms for discrete tomography
Promotor: R. Tijdeman, Co-promotor: H.J.J. te Riele
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Atomic Insights into Hydrodesulfurization
Hydrodesulfurization (HDS) is an ubiquitous part of oil refining that ensures that fuels are cleaned of impurities and environment release of pollutants such as SOx and NOx gasses are minimized.
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Surface plasmon lasers
Surface plasmons (SPs) are surface waves at the interface between a dielectric and a good metal, and are formed by the interaction between light and the free electrons at the metal-dielectric interface. They provide strong field confinement for optical fields, opening new possibilities for enhanced…
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Tangent fermions: massless fermions on a lattice
In some condensed matter systems, such as the surface of a 3D topological insulator, the electrons are effectively massless and we must necessarily use the massless Dirac equation to describe them.
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Elektronen gevonden die stromen als water
Het blad Science publiceert drie artikelen tegelijk over een belangrijke ontdekking in vastestoffysica. Leids natuurkundige Jan Zaanen bespreekt deze ontdekking in dezelfde uitgave van 4 maart.
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Kleinste Universiteit Leiden-logo gemaakt
Het logo van de Universiteit Leiden, met letters zo klein als een bacterie. Wetenschappers van het LUMC en het Instituut Biologie hebben het kleinste logo ooit van onze universiteit gemaakt. Een grapje met een serieuze ondertoon: met de nieuwe microscoop waarmee het logo is gemaakt, kunnen zij nog gedetailleerder…
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Growth and Transport properties of (Rare Earth)TiO3 / SrTiO3 interfaces
This thesis presents the results of a study on the interfaces of insulating oxides with and without the insertion of a magnetic layer.
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Targeting Human Proteasomes: Substrates, Inhibitors and Prodrugs
Large parts of the research described in this Thesis aims at the development of oligopeptide-masked toxins and their in situ immunoproteasome-mediated activation.
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Dynamic hydrogels as synthetic extracellular matrices for three- dimensional cell culture
Synthetic hydrogels that mimic the natural extracellular matrix in the biophysical and biochemical cues it provides to cells are in high demand, however the cell phenotypes as they are observed in vivo in numerous cases have yet to be attained.
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T-CYCLE EPR: Development at 275 GHz for the study of reaction kinetics & intermediates
A difficulty of studies on chemical kinetics are the reaction time scales and detection of their intermediates.
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Synthetic, Physical and Computational Chemistry of Propeller-shaped Polycyclic Aromatic Hydrocarbons
This thesis systematically studies the physicochemical properties of non-planar, propeller-shaped, polycyclic aromatic hydrocarbons. The synthesis of several so-called propellerenes is described on a gram scale, using optimized procedures aimed at using less hazardous reagents and reducing the amount…
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Geert-Jan Kroes
Wiskunde en Natuurwetenschappen
g.j.kroes@chem.leidenuniv.nl | +31 71 527 4396
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Nieuwe techniek om geleiding te meten in gestapelde nanomaterialen
Leidse natuurkundigen hebben een nieuwe techniek ontwikkeld om elektrische geleiding te visualiseren in materiaal van gestapelde individuele atoomlagen. Jaap Kautz en Johannes Jobst, die dit jaar de NeVacprijs ontvingen voor hun onderzoek, publiceerden in Nature’s Scientic Reports.
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Onderzoek naar ferritine: ‘we hopen dat dit uiteindelijk meer inzicht geeft in Alzheimer’
Martina Huber, Jacqueline Labra Munoz onderzoeken de ziekte van Alzheimer. Ze bestudeerden ferritine, ofwel de opslag van ijzer in de hersenen. Een inbalans van ijzer kan een rol spelen bij deze vorm van dementie.
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Onderzoek
Onderzoekers vanuit verschillende vakgebieden werken samen om oplossingen te bedenken voor maatschappelijke problemen.
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Nobelprijs Scheikunde voor 3D-beelden van moleculen
De Nobelprijs voor Scheikunde 2017 is uitgereikt aan Jacques Dubochet, Richard Henderson en Joachim Frank, voor hun ontwikkeling van de cryo-elektronenmicroscopie. Met deze techniek kunnen biomoleculen in 3D in beeld gebracht worden, legt hoogleraar Ultrastructuurbiologie Ariane Briegel uit.