Dokumente Fakultät für Physik (inkl. GAUSS) nach Titel
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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 ... -
Ultrafast electron dynamics measured with a novel time-resolved high-repetition rate momentum microscopy setup
(2021-03-25)In this thesis, a new generation of a trARPES experiment has been successfully built up from scratch combining the advantages of a ToF momentum microscope with a lab-based HHG source, delivering femtosecond EUV pulses, ... -
Ultrafast Lorentz Microscopy using High-Coherence Electron Pulses
(2019-05-08)Information processing and storage applications demand increasing miniaturization and operation speeds, where optical manipulation of magnetic order may play a very important role. It is hence essential to study how light ... -
Ultrafast low-energy electron diffraction at surfaces
(2019-02-22)Due to their reduced dimensionality, surfaces and quasi two-dimensional materials exhibit numerous intriguing physical phenomena that drastically differ from the bulk. To resolve these effects and the associated dynamics ... -
Ultrafast momentum microscopy of dark exciton dynamics in real- and reciprocal-space
(2023-12-22)Combining both worlds of momentum and real-space time-resolved momentum microscopy, this thesis introduces a new approach to probe the entire exciton landscape and dynamics of twisted TMD heterostructures with momentum-, ... -
Ultrafast Probing and Coherent Vibrational Control of a Surface Structural Phase Transition
(2021-08-26)The present thesis explores the coherent control of surface structural phase transitions by all-optical manipulation of key vibrational modes. To this end, ultrafast low-energy electron diffraction (ULEED) in combination ... -
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 ... -
Ultrafast transmission electron microscopy of a structural phase transition
(2021-08-09)High hopes are placed on materials with tunable properties and excitations for future applications in energy conversion devices. Functionality of devices, however, not only arises from the properties of individual materials ... -
Ultraschallabsorptionsspektroskopie zur Untersuchung schneller molekularer Prozesse in Alkylglykosid-Lösungen
(2008-08-06)Alkylglycosides are molecules consisting of a hydrophobic alkyl chain and a hydrophilic head group, a glycoside. Due to this ambivalent structure of the molecules, above a specific concentration ... -
Ultraschallspektrometrie zum dynamischen Verhalten von Domänen in peptidhaltigen Lipidmembranen
(2005-08-05)In this thesis the influence of peptides on lipid membranes in vicinity of the main phase transition is investigated using ultrasonic spectrometry. For these experiments unilamellar vesicles ... -
Ultraschallunterstützte Kupferabscheidung
(2017-08-03)The electroless and electrolytic copper deposition are essential process steps in the production of printed circuit boards. Various studies have already shown that ultrasound can improve these processes. However, ultrasound ... -
Unbiased evaluation and development of Green's-function-based density-matrix functionals
(2016-10-25)Ab-initio calculations are dominated by density functional theory (DFT), which provides an efficient and accurate description of the electronic structure for most materials. For materials with strong correlations, however, ... -
Unconventional Phases in Two-Dimensional Hubbard and Kondo-Lattice Models by Variational Cluster Approaches
(2017-03-31)Materials with strongly correlated electrons show a multitude of unconventional phenomena, such as superconductivity or magnetism, that cannot be explained in a single-particle picture and necessitate to take many-body ... -
Understanding the brightness variations of Sun-like stars on timescales of stellar rotation
(2021-01-21)Solar brightness varies on timescales from minutes to decades. In particular, the observed photometric variability can directly relate to the rotation period. Our understanding of this link allows extrapolations from the ... -
Understanding the molecular machinery of aquaporins through molecular dynamics simulations
(2012-01-02)Aquaporins are protein channels responsible for the permeation of water and other small solutes through biological membranes in response to osmotic pressure. The goal of the present thesis ... -
Unicellular Parasite Motility: A Quantitative Perspective
(2011-08-18)The question of how single cells swim is of primary medical importance - especially in the case of pathogenic parasites. Biochemical and cell biological studies have helped elucidate many ... -
Unraveling Femtosecond Spin and Charge Dynamics with EUV T-MOKE Spectroscopy
(2023-12-15)In this thesis, a novel transverse magneto-optical Kerr effect (T-MOKE) setup with extreme ultraviolet light from high-harmonic generation between 30 and 72 eV is used to study the spectrally-resolved spin and charge ... -
Unsteady gas flows and particle dynamics in the shock layer formed by the impingement of a supersonic two-phase jet onto a plate
(2005-08-10)Supersonic particle-laden jets impinging normally on plates are studied. The free jet studied is characterized by Mach numbers of 2.6-2.8 and stagnation temperatures of 300-500 K. The ... -
Untersuchung atomarer Strukturen an geordnetem und nanokristallinem ternären Fe3Al
(2011-08-25)This work presents a study of the atomic ordering of Fe3Al with the additions chromium, manganese, titanium and vanadium. This knowledge is the basis of a complete comprehension of the ... -
Untersuchung der elektrischen Hyperfeinwechselwirkung in M<sub>n+1</sub>AX<sub>n</sub>-Phasen mittels der gestörten γ-γ-Winkelkorrelation
(2014-05-19)Mn+1AXn phases are thermodynamically stable nanolaminated ternary carbides and nitrides showing both metallic and ceramic properties. The letter M stands for an early transition metal, the letter A represents an A-element ...