Now showing items 1-20 of 861

• #### 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. ...
• #### Higher Order Electroweak and QCD Corrections in e+e−μ+μ− production at LHC ﻿

(2022-11-09)
This thesis focuses on improving the theoretical modelling of the process pp → e+e−μ+μ− at LHC by including both EW and QCD higher-order perturbative corrections. The EW corrections are studied at NLO fixed order and in ...
• #### Dynamics and Self-organization of Crowded Active Systems ﻿

(2022-10-20)
The perplexing and intriguing world of biological systems has inaugurated a new research field in statistical physics: out-of-equilibrium systems, known as active matter that mimic systems in the biological world around ...
• #### Axion Miniclusters: Formation, Structure and Observational Signatures ﻿

(2022-09-29)
The axion is one of the leading candidates for cosmological dark matter. It arises as the pseudo-Goldstone boson of a spontaneously broken global U(1) symmetry. If this symmetry is broken after inflation, cosmic string ...
• #### Technologiebezogene Professionalisierung angehender Physiklehrkräfte - Entwicklung und Evaluation eines Lehrkonzepts in der Astrophysik mit digitalen Medien ﻿

(2022-09-09)
This thesis discusses the development and empirical evaluation of a university course in the form of an astrophysics tutorial that focuses on teaching and learning with digital media. Framed by design-based research, an ...
• #### How does stellar convection impact the detection of small planets at high radial velocity precision? ﻿

(2022-08-15)
One of the big driving forces behind exoplanet research is the search for an Earth-twin to answer the old question of whether or not humanity is alone in the universe. According to simple logic as well as our current ...
• #### Investigation of the Influence of Correlations on Photovoltaic Energy Conversion in Hot Polaron Solar Cells ﻿

(2022-08-08)
In semiconductor single junction solar cells fundamental limitations are given by the two major intrinsic loss mechanisms: a) inability to absorb photons with energies below the band and b) thermalization of photon energies ...
• #### Stochastic field theory of viscoelastic solids: a quantitative study of phononic friction ﻿

(2022-07-27)
Identifying the relevant dynamics of solids that give rise to friction is an active field of study. It includes electronic and phononic degrees of freedom, but the latter seems to be of particular significance. For instance, ...
• #### Structure formation in binary polymer systems: Short-time dynamics and dynamics of crosslinked systems ﻿

(2022-07-27)
Structure evolution in multicomponent polymer melts and in their network equivalents is investigated. In the first part, particle-based simulations reveal that on short length and time scales, the collective kinetics of ...
• #### In-situ Environmental Transmission Electron Microscopy Investigation of Perovskite Oxide Thin Films During Electrochemical Oxygen Evolution Reaction. ﻿

(2022-07-21)
Despite many theoretical and experimental efforts to find active catalysts in oxygen evolution reaction (OER), the mechanism for high activity and long-term OER stability remains elusive. Catalyst-electrolyte interface ...
• #### Effective simulations of interacting droplets ﻿

(2022-06-20)
Liquid-liquid phase separation is ubiquitous in everyday life, such as formation of oil droplets in water. This phenomena has been observed in biological cells as well, where membrane-less organelles, also known as ...
• #### Solar surface flows during active region emergence ﻿

(2022-06-16)
The aim of this thesis is to improve our understanding of the emergence of magnetic flux in the form of active regions (ARs) to the solar surface. Active regions are concentrations of strong magnetic field at the surface ...
• #### Matrix Product State Approaches to Non-equilibrium Spectral Quantities of Strongly Correlated Fermions in One Dimension ﻿

(2022-06-09)
In this thesis we numerically study non-equilibrium phenomena in one-dimensional quantum many-body systems. We discuss extensions of the concepts of spectral functions and of the optical conductivity to time-dependent ...
• #### Mean field theories for the aging and yielding of athermal amorphous solids ﻿

(2022-05-31)
In this thesis we study mean field elastoplastic models to understand athermal amorphous solids, which show complex slow relaxation (aging) phenomena and intricate mechanical responses under deformation. These models ...
• #### Chemical Reactions as Control Mechanisms for Biomolecular Condensates ﻿

(2022-05-31)
Biological cells need to structure their interior in space and time. One way this is done are containers enclosed by a membrane as a physical barrier that can control which molecules enter and leave the container. Another, ...
• #### Thermal Convection: Differential heating, travelling thermal waves and turbulent superstructures ﻿

(2022-05-30)
Turbulent thermal convection is ubiquitous in geophysical, astrophysical, and industrial applications. In the present work, various phenomena in the convective paradigm systems of horizontal convection and Rayleigh-Bénard ...
• #### Advanced multiplexing techniques in single molecule localisation microscopy ﻿

(2022-05-13)
DNA point accumulation for imaging in nanoscale topography (DNA-PAINT) is a powerful super-resolution technique highly suitable for multi-target (multiplexing) bio-imaging applications. However, multiplexed imaging of cells ...
• #### Leaflet-resolved localization and diffusion of molecules within membranes using metal-induced energy transfer ﻿

(2022-05-10)
Diffusion is the most fundamental process of molecular transport in cell membranes and an important factor in maintaining its fluidity, controlling the dynamics and functioning of the membrane. In-depth knowledge of membrane ...