Books

Spin-based phenomena are the central concept in the field of spintronics, where efficient spin current generation, spin-to-charge conversion, and spin transport are the key concepts for the development of next-generation electronic devices. With the extensive availability of femtosecond lasers a new research field of ultrafast spintronics has opened up, aiming to understand spin-transport on the ultrafast time scales. [...]

As conventional CMOS technology approaches its scaling limits, alternative memory and logic device concepts are being actively pursued. Among these, resistive and ferroelectric switching mechanisms have emerged as promising candidates for non-volatile memory technologies due to their potential for high density, low power consumption, and compatibility with existing semiconductor processes. [...]

The growing demand for renewable energy and the need for efficient energy conversion technologies have spurred significant interest in solid oxide cells (SOCs). Recently, proton-conducting ceramic cells (PCCs) have gained considerable attention due to their potential to operate at lower temperatures than oxygen-ion-conducting SOCs. [...]

Transformation towards renewable energy sources and reduction of greenhouse gas emissions to mitigate climate change are among the most severe challenges of humankind today. Energy storage bears the potential to enable this transformation when applied as grid energy storage, which could enhance the utilization of renewable energy sources [...]

Predicting how quickly a fire can grow over surrounding combustible materials is a critical aspect in assessing fire scenarios. A promising approach to this challenge lies in numerical flame spread simulations that are able to predict the heat release rate (HRR) and rate of spread (ROS), based on pyrolysis modelling. [...]

Single-crystal turbine blades made of nickel-based superalloys, such as CMSX-4, are of great importance for gas turbines due to their excellent high-temperature properties, however, they are subject to various damage mechanisms. Repairing these costly components is desirable for both ecological and economic reasons; however, it poses a challenge as the single-crystal microstructure in the repair area must be restored. [...]

Since renewable energy sources supply electricity with temporal fluctuations, efficient energy storage methods play a key role in bridging the gap between generation and consumption. Proton exchange membrane water electrolysis (PEM electrolysis) represents a central technical solution in this context. [...]

This thesis paves the way for the assembly of supramolecular structures by autonomous robotic nanofabrication based on RL and their characterisation using the tools of nanoscience. In a proof of principle application the RL agent removed single molecules from a layer in which they were held together by strong molecule-surface and intermolecular interactions. [...]

Climate change mitigation requires the rapid defossilisation of the German electricity sector. While energy system models are extensively used to evaluate climate change mitigation strategies, they generally consider environmental aspects in a limited manner, often focusing on direct operational emissions. [...]

Semiconductor quantum computing leverages quantum dots as qubits, where achieving high qubit fidelity is one essential requirement for scalability. The formation of qubits and associated sensor dots necessitates meticulous iterative voltage adjustments, a tuning process that is ordinarily executed manually by researchers. [...]