Dokumente Fakultät für Physik (inkl. GAUSS) nach Erscheinungsdatum
Anzeige 1-20 von 912
-
Ultrafast spin dynamics in FeNi alloys
(2023-11-17)In this thesis, the optical intersite spin transfer in ferromagnetic FeNi alloys is studied on the femtosecond timescale. Extreme ultraviolet transverse magneto-optical Kerr effect spectroscopy (EUV T-MOKE) is used to ... -
Symmetries and correlations in solids probed by ultrafast high-harmonic spectroscopy
(2023-11-13)Novel material systems with correlated and tunable properties promise to push the boundaries of current information processing and energy management technologies. Their investigation requires simultaneous access to multiple ... -
Elektronenmikroskopische Untersuchung des Einflusses elektrischer Felder auf das Sinterverhalten von Oxidkeramiken
(2023-11-09)Despite the wide application potential of flash sintering for processing ceramic materials, the physical origins of the effect remain unclear. Therefore, the primary objective of this work is to gain a deeper understanding ... -
Multiscale simulations of liquid-liquid interfaces: From lipid membrane to graphene
(2023-11-06)There is an increasing demand to enhance the development of coarse-grained models in order to facilitate highly efficient simulations of realistic biological systems. In our endeavor to tackle this challenge, in chapter ... -
Ultra-low Energy Ion Implantation into Graphene
(2023-11-03)This thesis explores the advancement of ultra-low energy (ULE) ion implantation as a method for precisely doping of graphene, with the aim of tailoring its properties for specific applications. The incorporation of impurity ... -
Electronic and Structural Properties of Heterojunctions in Solar Cells studied by In-situ and Analytical Transmission Electron Microscopy
(2023-11-03)The overarching goal of this dissertation is to investigate new principals to increase photovoltaic efficiency. In this context, three topics are presented, one concerning the application of carrier selective contacts ... -
Microstructural Investigations of Epitaxial GaN Films Grown on MgF2 using Transmission Electron Microscopy
(2023-10-27)For the development of novel solar-blind UV multichannel plate detectors planned for applications in astronomy, it would be advantageous to grow GaN acting as the photocathode directly on a typical window material like ... -
Modelling the evolution of small bipolar regions on the Sun
(2023-10-23)Solar activity affects life on Earth in various ways, from geomagnetic storms to the terrestrial climate. The driver of solar activity is the solar magnetic field, which manifests itself in the form of small and large-scale ... -
A search for the Rieger-type periodicity on the Sun- like stars
(2023-10-06)Solar activity undergoes variations over many different timescales. The main periodicity is 11 years, called Schwabe cycle. In addition to the 11-year cycle, shorter periodic variations known as Rieger cycles have been ... -
Automated aberration correction for STED microscopy
(2023-09-26)Stimulated emission depletion (STED) microscopy is a powerful super resolution fluorescence microscopy technique that surpasses the diffraction limit. However, the performance of a STED microscope can be adversely ... -
Improving Monte Carlo simulations in high energy physics using machine learning techniques
(2023-09-15)Monte Carlo event generators are nowadays indispensable tools for predictions based on first principles in high energy physics, and they represent one of the mainstays of particle physics research at the Large Hadron ... -
Structure Investigations of LiMn2O4 as Oxygen Evolution Reaction Catalyst
(2023-09-15)The catalytic activity of a material is determined by the electronic structure and atomic arrangements at its surface. In particular, eg occupancy of octahedral cations has been found to be a successful descriptor of the ... -
Topological charge pumping in ultracold quantum gases
(2023-09-13)A topological charge pump is a one-dimensional, dynamical analogue of a quantum Hall system that is particularly well suited for studying topology, both theoretically and experimentally, since no synthetic gauge fields are ... -
Investigation of Physical and Chemical Effects in Sonicated Small Flow Channels
(2023-09-08)In the framework of intensification of chemical processes, miniature continuous flow reactors have come into focus in recent time. As a specific way of “non-classical” energy supply to the liquid in such a flow reactor, ... -
Phase-Dependent Energy Dissipation Processes in La0.7Sr0.3MnO3 and (La0.6Pr0.4)0.7Ca0.3MnO3 after an Ultrashort Optical Excitation
(2023-08-31)La0.7Sr0.3MnO3 (LSMO) and (La0.6Pr0.4)0.7Ca0.3MnO3 (LPCMO) are perovsikte manganites which both show a ferromagnetic-to-paramagnetic phase transition. Interestingly, the development of the new phase when crossing the ... -
Correlated phases in the vicinity of tunable van Hove singularities in Bernal bilayer graphene
(2023-08-18)The naturally occurring Bernal bilayer graphene exhibits a complex low-energy band structure hosting electric-field-controlled Lifshitz transitions and van Hove singularities. The diverging density of states is predicted ... -
Resource Bounded Agency in Public goods Games
(2023-07-28)The new and emerging field of sociophysics aims to explain and understand collective behavior demonstrated by humans in a variety of domains. This usually requires to make some assumptions about the microscopic inter-human ... -
Analytic studies on the SYK models: from instantaneous thermalization to holographic duality
(2023-07-18)The quasiparticle picture is so prominent in condensed matter physics that it is almost taken as an axiom. Without this simplification, the physics becomes nearly intractable. However, the physics also becomes remarkable, ... -
Interlayer effect on the hydrogen uptake in Vanadium films: Stress development, surface topography and optical behavior changes
(2023-07-13)The purpose of this study is to investigate hydrogen absorption-related properties changes of nanocrystalline thin films by varying the elastic constraints condition. The elastic constraint condition is varied by using ... -
Spanwise rotating convection in an ideal gas
(2023-06-23)Spanwise rotating convection is a model for the equator region of planets like Jupiter or Earth's outer liquid core. Direct numerical simulations of the Navier-Stokes, and continuity equation as well as an equation for the ...