Scientific defense

In situ and operando Electrocatalysis: Shape-dependent Nanocatalysts for the CO2 Reduction and the Formic Acid Oxidation

Rovibronic Transitions in Molecules: Toward an Exact Approach

Molecules exhibit complex structural and dynamical behavior manifested in their degrees of freedom. The common approach to help us understand this complexity is to start with a zero-order approximation. Beyond the zero-order picture, the voyage to explore the molecular world is just about to begin. [more]

Scientific defense

Operando Insights into Size and Shape-controlled Cu-based Nanocatalysts for the Electrochemical Reduction of CO2 toward C2+ Products

Semiconductors and Topological Insulators for Infrared and Terahertz Metamaterials

When working in the infrared (IR) or terahertz (THz) spectral ranges, traditional optical materials like gold and silver have extremely large and negative permittivities. This means it is difficult to use these materials for plasmonics or hyperbolic metamaterials, both of which require materials with relatively small and negative permittivities. We must therefore explore alternative materials. In this talk, I will focus on two classes of materials: heavily-doped III-V semiconductors for the IR and topological insulators for the THz. [more]

Department Seminar - Twisted Tessellations - Coherent Control of the Translational and Point Group Symmetries of Crystals with Light

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Hydrogen-Involved Surface Processes on Model Catalysts

The first topic of this talk is focused on the atomic-scale processes of dissociative adsorption and spillover of hydrogen on the single atom alloy catalyst (SAAC) Pd/Cu(111) [1]. The hydrogen spillover on the Cu(111) surface from the Pd site was successfully observed in real-time using infrared reflection absorption spectroscopy (IRAS) at 80 K. The observed chemical shifts of Pd 3d5/2 in X-ray photoelectron spectra (XPS) indicate that H2 is dissociated and adsorbed at the Pd site initially. [more]

Ultrafast Exciton Dynamics in Moiré Heterostructures: a Time-resolved Momentum Microscopy Study

Transition metal dichalcogenides (TMDs) are an exciting model system to study ultrafast energy dissipation pathways, and to create and tailor emergent quantum phases [1,2]. The versatility of TMDs results from the confinement of optical excitations in two-dimensions and the concomitant strong Coulomb interaction that leads to excitonic quasiparticles with binding energies in the range of several 100 meV. [more]


From Levinthal’s Paradox to the Enigma of Disappearing Polymorphs: Using Minima Hopping to Explore the Synthesizability and Stability of Materials

Each local Minimum on the potential energy surfaces corresponds to a stable structure. In a theoretical structure search one typically finds a number of low energy minima that is much larger than the number of experimentally known structures. [more]

TH-Seminar: Professor Harald Oberhofer

The Theory Department invites you to this year's FHI Summer Party, a Prussian-Bavarian summer festival with the motto "Fritzn's Wiesn". [more]

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