Our techniques include time- and angle-resolved photoelectron spectroscopy trARPES , femtosecond electron diffraction and microscopy , and time-resolved optical spectroscopy. Thomas received his PhD in physics for his investigations of ultrafast energy flow and structural dynamics in nanoscale heterostructures with femtosecond electron diffraction.
Collaborators from the group of Andreas Knorr at the TU Berlin developed a theoretical description of angle-resolved photoemission signals from transient excitonic states. A preprint is available at arXiv Contrast enhancement is an important preprocessing technique for improving the performance of downstream tasks in image processing and computer vision. Our multidimensional photoemission spectroscopy results in densely sampled data of higher than three dimensions.
The initial understanding of these complex multidimensional datasets often requires human intervention through visual examination, which may be hampered by the varying levels of contrast permeating through the dimensions. The algorithm is publicly available , a preprint of its description is avalable here: [more We participated in a larger consortium establishing time-resolved momentum microscopy with such 4th generation photon sources.
A preprint describing this technical development can be found here: D.
Kutnyakhov et al. OA: arXiv Its use for the distortion correction of volumetric photoemission data is demonstrated. The code is provided as open source software package for sharing and reuse. The DFG just approved a third 4-year funding period starting July-1 We are new members of this collaborative research project and will investigate ultrafast [more Structural stability of nanoscale building blocks is prone to ultrafast lattice motions that range from atomic vibrations, to translations and rotations of entire nanostructures. In this work, we establish femtosecond electron diffraction as goniometer of ultrafast nanocrystal rotations.
To achieve our goal, we have combined size-selected synthesis of Au nanoclusters on graphene and femtosecond electron diffraction experiments with molecular dynamics and electron diffraction simulations. Our investigations aim for a more complete understanding of out-of-equilibrium conditions, heat- and mass-transport in nanoscale heterostructures.
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The article is now published in Nanoscale Horizons and it was the product of an international collaboration that involved, among others, [more BiGmax is a Max Planck Research network on big-data-driven materials science. We collaborate with computer scientists from the MPI for Intelligent Systems to apply machine learning approaches to multidimensional photoemission data.
We are seeking a postdoctoral researcher for this interdisciplinary project merging condensed matter physics and computer science. We developed a high-repetition rate extreme ultraviolet laser source photon energy: 22 eV, pulse duration: 20 fs which is used as probe pulses in trARPES experiments. This experimental setup allows multidimensional photoemission spectroscopy: the electronic structure of solids in an excited state can be observed in energy, both parallel momentum directions, and time. In collaboration with the group of Peter Baum , Univ. Konstanz, a short-pulse electron source providing few-electron bunches with a duration below 30 fs was developed.
Ehberger et al. Applied 11, Helene will study ultrafast structural dynamics in photovoltaic materials. This is dictated by the arrangement of the electrons as the atoms move along gradients on an energy landscape defined by the electrons. Chris Nicholson, former collaborator from the Dynamics of Correlated Materials Group , receives the Carl-Ramsauer-Preis for his PhD studies on ultrafast electron dynamics in low-dimensional systems.
Congrats, Chris! Vasileiadis et al. OA: arXiv These findings result from a collaboration with the group of Richard Palmer, Swansea University. We received funding for a collaboration with the group of Majed Chergui for the investigation of perovskite materials with ultrafast techniques.
Congratulations, Lutz! We will collaborate with Lars on ultrafast microscopy and phonon dynamics in nanomaterials. We are participating in the trans-regional collaborative research center TRR We investigate the basic mechanism of electron-phonon interaction with ultrafast techniques, in particular femtosecond electron diffraction.
By tacking snapshots of the atomic structure of a sample, movies of ultrafast structural dynamics can be obtained. In this work, we investigate the layered semiconductor material tungsten diselenide and show that the electrons interact preferentially with phonons with large momentum vector.
After the completion of the new high-precision labs of the Department of Physical Chemistry, we finally merge all experiments in a single lab. The investigation of the motion of electrons and atoms in nanostructures requires ultrafast measurement techniques with a high sensitivity to tiny sample volumes. Low-energy electrons have the highest scattering cross section and interact strongly with electric and magnetic fields. Utilizing this technique, Melanie demonstrated that the photocurrent arising inside an InP nanowire after optical excitation e can be filmed with femtosecond resolution.
Melanie received her PhD with distinction. The semimetal antimony is a model system for studying electron-lattice correlation and coherent phonons. The electronic structure of antimony induces a static lattice distortion, a so-called Peierls distortion. Other elementary diatomic molecules.
Metallic aggregates. Macroscopic phases of transition metals. Aggregates and solids of tetravalent sp elements. Aggregates of covalent dimers. Weak distortions of metallic closepacked or covalent structures.
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The free enthalpy without mixing. The valence fluctuation temperature. The free enthalpy with interconfigurational mixing. Equation of state for the valence fluctuation temperature. Application to Ce metal. Experiments and experimental results.
Densities of states and optical properties. Localized states and mobility edges. Point defects. Time-of-flight experiments.
Densities of states in the gap. Screening of interionic forces. Mixtures with forces screened to short range.
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Miscible fused salt - Molecular liquid systems. Strong unscreened electrical forces.
Experimental evidence for ultrafast intermolecular relaxation processes in hydrated biomolecules
Experimental results. Atomic scale structure. Dynamical properties. Electronic structure. Liquid semiconductors based on Tellurium. The method of neutron diffraction with isotopic substitution. Future prospects. Alkali Halides. Silver Halides. The metal-nonmetal transition: global considerations. A survey of magnetic properties: microscopic considerations. Concluding remarks. Solvation across the metal to insulator transition.
Fundamentals of Charged Particle Transport in Gases and Condensed Matter
Structure and thermodynamic relations. Thermodynamics of sodium ammonia solutions. Thermodynamics of solvated electrons in ammonia. Absolute electrode potentials. Electrode potential determining particle. Thermodynamics of solvated electrons in water. A new phase instability in sodium ammonia solutions.
Solid Na NH3 3 - An expanded metal.