### Recent Submissions

• #### Actin structure formation, membrane dynamics, and force generation during blood platelet spreading ﻿

(2023-03-17)
Blood platelets are essential to the formation of blood clots and prevent uncontrolled bleeding. They are non-nucleated fragments of larger bone marrow cells known as megakaryocytes. Platelets undergo fast morphological ...
• #### A coronal loop in a box: From energy generation to coronal emission ﻿

(2023-03-17)
The corona is the outer atmosphere of the Sun. It contains an abundance of bright arcs that consist of hot plasma trapped by the magnetic field. These coronal loops are heated to temperatures far surpassing the solar surface ...
• #### Investigation of laser-induced structures on metal surfaces produced via two-beam and laser-plasmon interference ﻿

(2023-03-15)
Periodic surface structures can change the properties of material surfaces. The obtained various functionalities strongly depend on the type of the specific structures. This work deals with the generation of periodic ...
• #### In-situ lithiation of lithium manganese oxide in a transmission electron microscope ﻿

(2023-03-15)
This thesis presents in-situ studies of the lithiation of lithium manganese oxide in a transmission electron microscope. It focuses on the phase transitions from spinel to tetragonal phase and the role of defects on ...
• #### Imaging vortex pinning and gyration by time-resolved and in-situ Lorentz microscopy ﻿

(2023-03-08)
Magnetism encompasses a large variety of scientifically interesting and industrially valuable phenomena. In particular, nanoscopic magnetic textures—such as vortices, merons and skyrmions—have been in the spotlight of ...
• #### Wetting dynamics on soft surfaces ﻿

(2023-03-01)
Dynamic wetting of a liquid deposited on a soft solid is very common in many biological, medical, and industrial processes. Thus, understanding the interaction between a moving liquid drop and a soft surface remains crucial, ...
• #### Verformungsverhalten nanoskaliger Dünnschichten bei AFM-Indentierung ﻿

(2023-02-20)
Nanoscaled materials differ in their mechanical properties from their bulk counterparts. Reasons therefore are e. g. the different ratio of surface and volume, which leads to different deformation mechanisms. In the case ...
• #### Strong magnetic fields and unusual flows in sunspots ﻿

(2023-02-06)
This thesis presents a study of sunspots, which are the most prominent features observed on the solar surface. Their structure is governed by the magnetic field. The umbra and penumbra of sunspots harbor different strengths ...
• #### STED microscopy with two-photon photoactivation in the visible range & Application of generative adversarial networks for image reconstruction in STED microscopy ﻿

(2023-01-31)
The resolution limit of classical optical far-ﬁeld microscopes was broken with the invention of super-resolution microscopy. Today, a variety of these techniques achieving diﬀerent degrees of resolution exist. Image formation ...
• #### Transport and dynamical properties of electron-phonon coupled systems ﻿

(2023-01-31)
In this thesis, I investigate the transport and dynamical properties of electron-phonon coupled systems using numerical methods. I focus on the one-dimensional Holstein model, which incorporates both polaron and charge ...
• #### Simulations of Cosmological Structure Formation with Nonrelativistic Scalar Fields ﻿

(2023-01-20)
Nonrelativistic, self-gravitating scalar fields are of current interest in several scenarios of cosmological structure formation. This includes the gravitational clustering of dark matter in the late-time Universe which ...
• #### Far-from-Equilibrium Quasiparticle Dynamics in Graphene ﻿

(2023-01-17)
Comprehending far-from-equilibrium many-body interactions is one of the major goals of current ultrafast condensed matter physics research. Here, a particularly interesting but barely understood situation occurs during a ...
• #### Experimentelle Untersuchung von thermohalinen Treppen in doppelt-diffusiver Konvektion ﻿

(2023-01-12)
This study deals with the modeling of a laboratory experiment where steady states as well as transients of double diffusive staircases can be observed by Particle Image Velocimetry (PIV) in a fluid layer. A stabilizing ...
• #### High-Resolution Reflection Microscopy via Absorbance Modulation ﻿

(2023-01-11)
The properties of composite materials are primarily governed by their microstructural features, which can vary in size from a few nanometres to several micrometres. Optical microscopy is one of the primary tools for ...
• #### Nanoscale Friction Measurements on Manganite Thin Films: Which Material Properties are Important? ﻿

(2023-01-05)
Although the phenomenon of friction has been known to mankind for millennia, the underlying mechanisms that ultimately lead to the conversion of kinetic/mechanical energy into heat remain unclear. Based on Bowden and Tabor's ...
• #### Proton Beam Writing ﻿

(2022-12-16)
Proton beam writing (PBW) is a mask-less 3D structuring method that uses a focused, relatively high energy Proton beam, followed by an etching step to create free standing 2D and 3D structures in a large variety of target ...
• #### New Approaches to Cryo-EM Image Processing ﻿

(2022-12-16)
Using cryo-electron microscopy (cryo-EM), it is possible to resolve structures of biological macromolecules by averaging numerous projections of macromolecules (particle images) frozen in vitrified ice and imaged using ...
• #### Local excitation of confined molecule-surface hybrid systems ﻿

(2022-11-28)
Molecule-surface hybrid systems promise solutions for a variety of technological challenges – including the development of efficient catalysts as well as of molecular electronic devices. In this work, different molecule ...
• #### Physical modeling of motile and sedimenting plankton: from simple flows to turbulence ﻿

(2022-11-22)
Planktonic microorganisms play a fundamental role in oceanic ecology and chemical cycles. Different planktonic species are found at various levels of the oceanic trophic chain, ranging from photosynthetic organisms to ...
• #### Theory of solar oscillations in the inertial frequency range ﻿

(2022-11-16)
Recent observations have revealed that we lack a fundamental understanding of the large scale (with spherical harmonic degrees $l < 60$) flows in the Sun. Flows at these large scales are strongly influenced by rotation. ...