Leonard Müller
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View article: Electric-Field-Tunable Spin–Orbit Gap in a Bilayer Graphene/WSe<sub>2</sub> Quantum Dot
Electric-Field-Tunable Spin–Orbit Gap in a Bilayer Graphene/WSe<sub>2</sub> Quantum Dot Open
Experimental data and python scripts used to evaluate the data for the publication "Electric-Field-Tunable Spin−Orbit Gap in a Bilayer Graphene/WSe2 Quantum Dot" in Nano Letters.
View article: Hard X-ray Fourier transform holography at free electron lasers source
Hard X-ray Fourier transform holography at free electron lasers source Open
We report on the feasibility of Fourier transform holography in the hard X-ray regime using a Free Electron Laser source. Our study shows successful single and multi-pulse holographic reconstructions of the nanostructures. We observe beam-…
View article: Short nanometer range optically induced magnetic fluctuations accompanying ultrafast demagnetization of nanoscale ferromagnetic domains
Short nanometer range optically induced magnetic fluctuations accompanying ultrafast demagnetization of nanoscale ferromagnetic domains Open
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View article: Hard X-ray USAXS Fourier Transform Holography
Hard X-ray USAXS Fourier Transform Holography Open
We report on a Fourier transform holography study, employing hard X-ray energies at a 3rd generation storage ring. Nano-structures of various sizes and shapes have been measured in ultra small angle x-ray scattering configuration reaching …
View article: The beam stop as an intensity monitor
The beam stop as an intensity monitor Open
Free-electron lasers (FELs) provide unique possibilities in investigating matter down to femtosecond time and nanometer length scales, as well as in the regime of non-linear light-matter interaction. Due to the nature of FEL sources, the p…
View article: In-vacuum Helmholtz coils for pulsed magnetic fields studying ultrafast demagnetization
In-vacuum Helmholtz coils for pulsed magnetic fields studying ultrafast demagnetization Open
The availability of sub 100 fs short and highly intense free-electron laser (FEL) pulses allows for new insights in laser-induced ultrafast demagnetization (LID) of ferromagnetic thin films on nanometer length scales. We designed a pair of…
View article: Megahertz-rate ultrafast X-ray scattering and holographic imaging at the European XFEL
Megahertz-rate ultrafast X-ray scattering and holographic imaging at the European XFEL Open
The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, from chemistry to biology, giving researchers access to X-rays with unprecedented brightness, coherence and p…
View article: Nanoscale inhomogeneity of charge density waves dynamics in La2−xSrxNiO4
Nanoscale inhomogeneity of charge density waves dynamics in La2−xSrxNiO4 Open
While stripe phases with broken rotational symmetry of charge density are known to emerge in doped strongly correlated perovskites, the dynamics and heterogeneity of spatial ordering remain elusive. Here we shed light on the temperature de…
View article: Techno-Economic Assessment & Life Cycle Assessment Guidelines for CO2 Utilization (Version 2.0)
Techno-Economic Assessment & Life Cycle Assessment Guidelines for CO2 Utilization (Version 2.0) Open
Climate change is one of the greatest challenges of our time. Under the auspices of the UN Framework Convention on Climate Change and through the Paris Agreement, there is a commitment to keep global temperature rise this century to well b…
View article: Making Sense of Techno-Economic and Life Cycle Assessment Studies for CO2 Utilization
Making Sense of Techno-Economic and Life Cycle Assessment Studies for CO2 Utilization Open
Carbon capture and utilization (CCU) or CO2 utilization technologies attract researchers, policy makers, and industry actors in search of sustainable solutions for industrial processes. This increasing interest can be explained by the fact…
View article: Role of electronic excitation, relaxation and transport processes for X-ray induced ultrafast demagnetization within magnetic multilayer systems
Role of electronic excitation, relaxation and transport processes for X-ray induced ultrafast demagnetization within magnetic multilayer systems Open
We investigated the role of electronic excitation, relaxation and transport processes in X-ray induced ultrafast demagnetization of magnetic multilayer systems. In what follows, we report on the results obtained with the newly developed mo…
View article: Megahertz-rate Ultrafast X-ray Scattering and Holographic Imaging at the European XFEL
Megahertz-rate Ultrafast X-ray Scattering and Holographic Imaging at the European XFEL Open
The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, from chemistry to biology, giving researchers access to X-rays with unprecedented brightness, coherence, and …
View article: Ultrafast Demagnetization Excited by Extreme Ultraviolet Light From a Free-Electron Laser
Ultrafast Demagnetization Excited by Extreme Ultraviolet Light From a Free-Electron Laser Open
Ultrashort and intense extreme ultraviolet (XUV) and X-ray pulses readily available at free-electron lasers (FELs) enable studying non-linear light−matter interactions on femtosecond timescales. Here, we report on the non-linear fluence de…
View article: Measurement of Spin Dynamics in a Layered Nickelate Using X-Ray Photon Correlation Spectroscopy: Evidence for Intrinsic Destabilization of Incommensurate Stripes at Low Temperatures
Measurement of Spin Dynamics in a Layered Nickelate Using X-Ray Photon Correlation Spectroscopy: Evidence for Intrinsic Destabilization of Incommensurate Stripes at Low Temperatures Open
We study the temporal stability of stripe-type spin order in a layered nickelate with x-ray photon correlation spectroscopy and observe fluctuations on timescales of tens of minutes over a wide temperature range. These fluctuations show an…
View article: Slowing down of dynamics and orientational order preceding crystallization in hard-sphere systems
Slowing down of dynamics and orientational order preceding crystallization in hard-sphere systems Open
Dynamics in dense hard-sphere systems close to crystallization and vitrification is governed by their orientational order.
View article: Direct 2D spatial-coherence determination using the Fourier-analysis method: multi-parameter characterization of the P04 beamline at PETRA III
Direct 2D spatial-coherence determination using the Fourier-analysis method: multi-parameter characterization of the P04 beamline at PETRA III Open
We present a systematic 2D spatial-coherence analysis of the soft-X-ray beamline P04 at PETRA III for various beamline configurations. The influence of two different beam-defining apertures on the spatial coherence properties of the beam i…
View article: Ultrafast Magnetisation Dynamics at the Low-Fluence Limit Supported by External Magnetic Fields
Ultrafast Magnetisation Dynamics at the Low-Fluence Limit Supported by External Magnetic Fields Open
We report on ultrafast magnetisation dynamics in ferro-magnetic cobalt/platinum multilayers upon pumping by near and mid to far infrared radiation, utilizing sub-100 femtosecond free-electron laser pulses. The evolution of the excited magn…
View article: Structure beyond pair correlations: X-ray cross-correlation from colloidal crystals
Structure beyond pair correlations: X-ray cross-correlation from colloidal crystals Open
The results of an X-ray cross-correlation analysis (XCCA) study on hard-sphere colloidal crystals and glasses are presented. The article shows that cross-correlation functions can be used to extract structural information beyond the static…
View article: Employing soft x-ray resonant magnetic scattering to study domain sizes and anisotropy in Co/Pd multilayers
Employing soft x-ray resonant magnetic scattering to study domain sizes and anisotropy in Co/Pd multilayers Open
It is demonstrated that the magnetic diffraction pattern of the isotropic disordered maze pattern is well described utilizing a gamma distribution of domain sizes in a one-dimensional model. From the analysis, the mean domain size and the …
View article: Spatial coherence determination from the Fourier analysis of a resonant soft X-ray magnetic speckle pattern
Spatial coherence determination from the Fourier analysis of a resonant soft X-ray magnetic speckle pattern Open
We present a method to determine the two-dimensional spatial coherence of synchrotron radiation in the soft X-ray regime by analyzing the Fourier transform of the magnetic speckle pattern from a ferromagnetic film in a multidomain state. T…