Helmholtz Institute Freiberg for Resource Technology
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1328 research outputs found
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Data publication: Terahertz control of photoluminescence emission in few-layer InSe
No full textstreak camera data, meta dat
Supporting Data: Particulate matter triggers the formation of extracellular amyloid β and tau -containing plaques and neurite shortening in vitro
No full textSupplementary material including sample preparation, microscope setup, correlative microscopy analysis and supporting images
Evolution of point defects in pulsed-laser-melted Ge1-xSnx probed by positron annihilation lifetime spectroscopy
No full textRohdaten und analysedaten der Publikatio
Unlocking the potential of GaAs nanowires for telecom photonics
Get PDFStrain engineering is a powerful tool for designing nanowires with tailored properties for a variety of applications. By carefully controlling the built-in strain in nanowires, it is possible to tune their bandgap to the near-infrared region, making them ideal for applications in telecommunication and imaging. In our previous work, we demonstrated that in GaAs/In x Al 1-x As core/shell nanowires, the bandgap of the core can be narrowed by up to 40%, for x up to 0.54, via strain due to the lattice mismatch between the shell [1]. Here, we explored the upper end of the lattice mismatch regime, extending the same concept to the contents of the shell towards x = 1, achieving unusually high strain values. The strain in the core and its effect on band structure are studied by a combination of spectroscopic methods and high-resolution transmission and scanning-transmission electron microscopy (HR(S)TEM). Raman spectroscopy showed that the tensile strain in the GaAs core increased linearly with increasing the In content in the shell (Fig. 1a), following the trend we reported in the past for lower values of x [1]. This behavior suggests the absence of plastic relaxation despite the very large lattice mismatch between the core and the shell. Using cross-sectional and longitudinal HR(S)TEM observations, we assessed the strain distribution normal and along the nanowire axis (Figs. 1b to 1d), which was found to be in good agreement with finite element and molecular dynamics simulations. Above a critical x value, plastic relaxation sets in via dislocations (Fig. 1b). We also correlated the photoluminescence emission properties with the strain distribution in the core and the shell, and the corresponding band alignment via band structure simulations. All in all, our results identified the limits of a coherent core and shell heterostructures and the potential application of tensile-strained GaAs nanowires for C- and O-band telecom photonics
Data publication: LA-ICP-MS U-Pb cassiterite age data of the Sadisdorf deposit link Sn-Li-(W-Cu) mineralization in the eastern Erzgebirge to the collapse of the Altenberg-Teplice Caldera
No full textThis data repository contains sample overview photographs as well as the U-Pb LA-IC-MS measuring conditions, results and Tera-Wasserburg diagrams summarizing those results
Data publication: Bottom-up Fabrication of FeSb₂ Nanowires on Crystalline GaAs Substrates with Ion-induced Pre-patterning
No full textBei dem Datensatz handelt es sich um die Daten für die Abscheidung von FeSb₂ Nanodrähten auf GaAs-Substraten mit ioneninduzierter Vorstruckturierung. Der Datensatz beinhaltet die AFM-Aufnahme der verwendeten Substratoberfläche und die TEM-Aufnahmen mit den EDXS- udn FFT-Ergebnisse
Data publication: Mass density vs. energy density at cosmological scales
No full textThe dataset consists of matter power spectra at four redshifts (z=80,50,15,0) generated by simulating Lambda-Cold Dark Matter cosmology with respect to two distinct weak-field expansion schemes (one relevant to the energy density and the other relevant to the mass density of matter) as described in the associated paper. Additionally, it contains the power spectrum of the gravitational potential at the same redshift values, based on the expansion scheme of the screening approach only
Efficient ultrafast field-driven spin current generation for spintronic terahertz frequency conversion (raw data in Origin project)
No full textIn this Origin project file (*.opju) we provide an access to the raw data which we obtained and analyzed. The result of our analysis are presented in the publication "Efficient ultrafast field-driven spin current generation for spintronic terahertz frequency conversion"
Simulation analysis for: Reduction of the electron beam divergence of laser wakefield-accelerators by integrated plasma lenses
No full textThis is a jupyter notebook used to analyze the LWFA plasma lens simulations ran at summit ORNL
HZDR Multiphase Addon for OpenFOAM
No full textThe HZDR Multiphase Addon is a software publication released by Helmholtz-Zentrum Dresden-Rossendorf according to the FAIR principles (Findability, Accessibility, Interoperability, and Reuseability). It contains experimental research work for the open-source CFD software OpenFOAM, released by The OpenFOAM Foundation. The developments are dedicated to the numerical simulation of multiphase flows, in particular to the multi-field two-fluid model (Euler-Euler method).Highlights of the provided addon are:HZDR Baseline Model: addonMultiphaseEulerFoam solver with full support of the HZDR baseline model set for polydisperse bubbly flows, including configuration files and tutorials for simplified setup of Baseline cases (Hänsch et al., 2021).Population Balance Modelling: A GPU-accelerated population balance method according to Petelin et al. (2021).Morphology-adaptive Multifield Two-fluid Model (MultiMorph): cipsaMultiphaseEulerFoam solver featuring a morphology-adaptive modelling approach (dispersed and resolved interfaces, Meller et al., 2021) with an interface to the multiphaseEulerFoam framework to utilise all available interfacial models, and configuration files and tutorials for easy setup of cases with the MultiMorph Model.more ...This work was supported by the Helmholtz European Partnering Program in the project "Crossing borders and scales (Crossing)"