Publications database

Since the invention of the laser nonlinear effects such as filamentation, Rabi-cycling and collective emission have been explored in the optical regime leading to a wide range of scientific and industrial applications. X-ray free electron lasers (XFELs) have led to the extension of many optical techniques to X-rays for their advantages of angstrom scale spatial resolution and elemental specificity. [...]

The high energy physics community recently gained access to the TPSCo 65 nm ISC (Image Sensor CMOS), which enables a higher in-pixel logic density in monolithic active pixel sensors (MAPS) compared to processes with larger feature sizes. To explore this novel technology, the Hybrid-to-Monolithic (H2M) test chip has been designed and manufactured. [...]

This thesis presents a search for a pair of light pseudoscalar bosons produced from the decays of the 125 GeV Higgs boson, focusing on final states with four tau leptons. This searchis motivated by numerous beyond the standard model theories that predict an extended scalar sector, introducing a wide array of new physical states beyond the single Higgs boson observed in the standard model. [...]

This paper describes an algorithm for reconstructing and identifying a highly collimated hadronically decaying $\tau $-lepton pair with low transverse momentum. When two $\tau $-leptons are highly collimated, their visible decay products might overlap, degrading the reconstruction performance for each of the $\tau $-leptons. [...]

Photon-by-photon analysis tools for diffusion-based single-molecule Förster resonance energy transfer (smFRET) experiments often describe protein dynamics with Markov models. However, FRET efficiencies are only projections of the conformational space such that the measured dynamics can appear non-Markovian [...]

Deutsches Elektronen-Synchrotron DESY (nachfolgend: „DESY“) zählt zu den weltweit führenden Forschungszentren in der Teilchenphysik, der Astroteilchenphysik, der Physik mit Photonen und der Beschleunigerphysik. Die in diesen Forschungsgebieten in großen Mengen erzeugten Daten stellen hohe Anforderungen an ihre sorgfältige Handhabung und Speicherung. [...]

Exploring the relations between coexisting, cooperative, or competing types of ordering is a key to identify and harness the mechanisms governing the mutual interactions between them and to utilize their combined properties. We have experimentally explored the response of the charge density wave (CDW) to various antiferromagnetic, metamagnetic, and field-aligned ferromagnetic states that constitute the magnetic phase diagram of TmNiC$_2$. [...]

Li- and Mn-rich layered oxides exhibit high specific capacity due to the cationic and anionic reaction process during high-voltage cycling (≥4.6 V). However, they face challenges such as low initial coulombic efficiency (~70 %) and poor cycling stability [...]

Ethylene carbonate (EC) is an organic solvent of the class of carbonate esters, which is used in state-of-the-art Li-ion batteries as part of the electrolyte mixture, being primarily responsible for the formation of a solid electrolyte interface. Thermal analysis showed that the sample’s melting point is 309 K [...]

Femtosecond Laser Irradiation followed by Chemical Etching is exploited to create microfluidic devices for High-order Harmonic Generation (HHG) in noble gases. A finetuning of the channels’ diameter and length permits the production of high-order harmonics in completely different regimes, going from the hollow waveguiding regime to the sub-mm interaction regime. [...]