Wall Forum 2025

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In the last years, our group has used Molecular Dynamics simulations to investigate collisions between H and H₂ and various tungsten surfaces, relying on Density Functional Theory for the description of the interactions. Here, recent works on the dynamics of scattering of H atoms on clean and H-covered W surfaces will be reviewed, focussing on energy transfers upon H reflection and H₂ recombination. Besides, recent results on the influence of O and N impurities on H₂ sticking will be presented. [mehr]

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Polarized beams and targets are an important tool in nuclear physics to study the spin dependence of nuclear forces at accelerators such as COSY@FZ Jülich. For this reason, various polarization methods have been developed in recent decades for hydrogen, deuterium and helium-3, which are now also used in other fields. This knowledge could be used, for example, in the generation of energy by nuclear fusion, as the cross-sections of the various fusion reactions are also strongly spin-dependent. This could considerably increase the energy yield or significantly reduce operating costs, for example by influencing the trajectory of the neutrons. Until then, however, some fundamental questions still need to be answered. In this talk, some classical polarization methods as well as new approaches are discussed and the current state of research on “polarized nuclear fusion” will be reported. [mehr]

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Atomic-scale microscopy has been a game changer for advancing materials science over the last century, from identifying and manipulating crystal structures to watching molecules move in real-time. Many physicists and engineers are not aware of the complex and fascinating design decisions that go into the creation of each microscope, which can lead to suboptimal usage, misunderstood results, and a missed opportunity to better appreciate the equipment. In this talk, I will discuss key physics principles that go into one of the most common types of atomic-resolution microscopes, the atomic force microscope (AFM). I will contextualise all of these concepts by relating them to the novel, low-temperature, high-vacuum AFM that I re-designed and re-built specifically to measure the electrostatic properties of dopant qubits buried in silicon. [mehr]