The main focus of this thesis is the behaviour of two-dimensional materials, namely (anti)-ferromagnetic materials in the first two chapters, which show topological phases, and energetic square ice in the third and fourth chapter.

Promotor: J. Zaanen

This thesis describes the functional analysis of the Arabidopsis AHL15 gene.

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.

Geometric phases lead to a nontrivial interference result when an electron's different quantum mechanical paths choices encircle a magnetic coil in an Aharonov-Bohm experiment.

Promotor: Prof.dr. W.Th.F. den Hollander, Co-promotor: R. Fernandez.

The energy system is at the heart of two of the greatest challenges of the 21st century: decreasing CO2 emissions to meet the ambitions of the Paris agreement while fulfilling the growing energy demand associated with the economic aspirations of a growing world population.

In the early universe, the dynamics of the Higgs field can give rise to many interesting phenomena.

Promotor: Prof.dr. M.L. van Hecke

SEAtrans: an interdisciplinary research project that aims at studying the dynamics and processes of transitions in society-nature interactions in Southeast Asian societies.

Promotor: Prof.dr. E. Bouwman, Co-Promotor: S. Bonnet

Promotor: W. T. F. den Hollander, F. H. J. Redig

In this course, you will learn about sustainability and staying with the environmental boundaries of our planet. You will gain an understanding of the effects of growing affluence and population growth, the key challenges we are facing, and ways to influence your direct environment.

Promotores: F.H.J. Redig, W.T.F. den Hollander

Systems with local constraints is a new finding in recent researches on complex systems. The heterogeneous spatial interactions and the temporal dependencies among those numerous units make it difficult to describe by traditional statistical physics.

This thesis aims to demonstrate how the achromatic nature and design flexibility of liquid-crystal optics can be used to improve high-contrast imaging instruments to facilitate detailed exoplanet characterization.

Galaxies are environments where gas coalesces, cools, and is converted into stars. However, it remains unclear the exact mechanisms through which galaxies acquire, redistribute and lose their gas.

Promotor: Prof.dr. M.L. van Heck, Co-Promotor: B.P. Tighe

This dissertation consists of two parts, each of which considers a different research area related to random interval maps. In the first part we are interested in random interval maps that are critically intermittent.

The transition to electric vehicles (EVs) reduces vehicle emissions to combat climate change. EVs raise concerns regarding the production of lithium-ion batteries and related emissions; while batteries can also provide energy storage services for the electricity system.

Like a mixture of oil and water, lipid membranes separate into two liquid phases.

We study the interplay of topology and geometry with chirality for several passive and active systems, employing both analytical and numerical methods.

This doctoral thesis is an effort to understand how lipid phase-separation induced by diacylglycerol analogues in lipid-based nanoparticles affects their in vivo behavior, leading to specific nanoparticle-protein communications and selective cell targeting.

The research described in this thesis focused on the preparation of S/N functionalized carbene ligands and their transition metal complexes, and the exploration of their application as electrocatalysts for proton reduction.

Metals surfaces form a group of effective catalysts for the reaction of small molecules such as hydrogen (H2).

Een uraniumkristal geeft al 35 jaar zijn geheim niet prijs: wat veroorzaakt de dramatische fase-overgang bij 17,5 Kelvin? Dankzij gebruik van kunstmatige intelligentie valt nu de helft van de mogelijke verklaringen af, maar de definitieve oplossing lijkt nog altijd ver weg. 'Het is echt heel frustrerend',…

Promotor: Prof.dr. F. den Hollander, G.Maillard

Promotor: C. W. J. Beenakker, Yu. V. Nazarov, Co-promotor: J. Tworzydlo

Jaroslaw Kantorowicz and Rok Spruk onderzoeken de bijdrage van institutionele hervormingen aan economische groei.

This dissertation investigates the energy and material related impacts of the transition towards a low-carbon heating system in the Netherlands, in the context of its 2050 climate and circular economy policy goals.

This thesis focuses on the synthesis, characterization and performance towards CO2 electroreduction of mono and bi-metallic particles based on p-block metals

Wiskunde en Natuurwetenschappen, Centrum voor Milieuwetenschappen Leiden (CML)

In this thesis new methodologies are developed for the detection and systematic study of radio sources in the early universe. This allows us to gain a deeper understanding of the formation and evolution of galaxies, the activity of supermassive black holes, and the final phase transition of our universe:…

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Plant architecture has distinct forms in different plant species, but also within a species the finalarchitecture of a plant is determined by its gradual development and changes therein induced by environmental conditions during the plant’s life cycle.

‘De prikkels in de wetenschap zijn net zo pervers als bij de banken’, vindt UMC-bestuurder en immunoloog Frank Miedema. Staan andere belangen goed wetenschappelijk onderzoek inderdaad in de weg? Op maandag 24 maart geeft prof. Miedema een openbare lezing over ‘Science in Transition’.

Mechanical forces are known to play an important role in bacterial colonies. In this dissertation, we study the self-organization at various stages of growing bacterial colonies, and focus on the mechanical effects of cell growth.

Submissions are sought for a special issue with Frontiers in Political Science that explores the conceptual and practical aspects of a ‘just’ energy transition both within and beyond Europe. In particular, contributions to the theoretical and interdisciplinary foundations of just transitions, as well…

With the help of quantum mechanics, digital quantum hardware may be able to tackle some of the problems that are too difficult for ordinary computers. But despite these expectations and the ongoing effort of the research community, reliable quantum computers are not yet realized in a lab setting.

This thesis presents the first synthetic peptides ADP-ribosylated on serine, threonine, tyrosine, arginine and cysteine.

This thesis covers various applications of topology in condensed matter physics and quantum information.

Promotor: Prof.dr. G.A. van der Marel, Co-Promotor: J.D.C. Codée

Promotor: Prof.dr. D. Bouwmeester

This thesis focusses on the temperature structure in protoplanetary disks. The relation between structures seen in the dust and gas-phase molecules is investigated.

In this thesis, we consider various (electro)chemical phenomena at surfaces and nanoparticles and their underlying atomistic processes, which we studied using first-principles methods such as density functional theory.

In this thesis, we study travelling waves in stochastic reaction-diffusion equations. We extend techniques from the deterministic theory for travelling waves to apply to the stochastic version, which allows us to compute the stochastic wave speed and shape, and draw conclusions on the stability of the…

Het Leidse natuurkunde-instituut heeft drie van de twaalf beschikbare subsidies in de wacht gesleept uit de FOM-Projectruimte. Groepsleiders Milan Allan, Stefan Semrau en Carlo Beenakker krijgen allen rond de 400.000 euro voor hun onderzoek.