Archiv 2022

Ort: CFEL (Bldg. 99)

Theory of Difference Frequency Quantum Oscillations

Microstructured Quantum Matter Seminar

Bringing light into electron microscopy: From ultrafast plasmonics to heralded single-photon sources

MPSD Seminar
The interaction of intense light fields with matter is pivotal in various physical contexts, ranging from coherent control schemes in atomic physics to steering the flow of energy in solid-state systems. In particular, joining free-electron beams with ultrafast lasers facilitates the probing of nanoscale dynamics in ultrafast transmission electron microscopy (UTEM) and opens the field of free-electron quantum optics. In my talk, I will briefly introduce the UTEM methodology that combines state-of-the-art TEM with optical pump-probe spectroscopy [1,2], show selected applications in the study of ultrafast dynamics, and discuss the coherent coupling of electrons and photons down to the single particle level. [mehr]

How to Remain a Scientist: Good Scientific Practice (IMPRS UFAST skills course)

IMPRS UFAST skills course

Electronic and magnetic responses in topological semimetals

Microstructured Quantum Matter Seminar

Project and Time Management for Scientists (IMPRS UFAST skills course)

IMPRS UFAST skills course

Exploiting free-electron lasers for time-domain interferometry and quantum optics

Max Planck Quantum Matter Seminar
Brilliant, ultrashort, and coherent X-ray free-electron laser (FEL) pulses allow for investigation of dynamics at the inherent time and length scale of atoms which I will illustrate at the example of recent data taken in the so-called hidden phase of the Van der Waals material 1T-TaS2. However, currently missing at X-ray FELs are sequences of phase-locked pulses, desirable for time-domain correlation spectroscopies and coherent quantum control. In this seminar, I will also present a scheme to generate sub-femtosecond, phase-locked X-ray pulse pairs with up to 100 fs delay. This enables time-domain interferometry, such as the X-ray analog of the ubiquitous Fourier transform infrared spectrometer or resonant inelastic X-ray scattering, and, more generally, all of nonlinear and quantum optics requiring coherent copies of beams. S. Reiche, G. Knopp, B. Pedrini, E. Prat, G. Aeppli & S. Gerber, PNAS 119, e2117906119 (2022). [mehr]

Black hole mirages

Microstructured Quantum Matter Seminar

An Epistemology of Oppression: How Science Created Social Hierarchies -- Women's Career Day

MPSD Equal Opportunities
The Keynote will unpack issues related to intersectionality and oppression, including diversity, equity, inclusion, discrimination and implicit bias in science. Using concrete examples, the keynote will bring clarity on these topics and invite the participants to widen and deepen their perspective, perceptions and beliefs on social injustice, allowing them to reflect on the positive role they can play towards a society free of systemic oppression. Registration: https://indico.desy.de/e/wcd2022 [mehr]

Density-potential inversion from Moreau-Yosida regularization

MPSD Seminar
For a quantum-mechanical system and a given density, the Zhao-Morrison-Parr method allows to infer the effective potential that yields precisely this density. I will discuss how this can be understood as a limit procedure from Moreau-Yosida-regularized density functionals to the unregularized case. This sheds new insight on the relevance of regularization in density-functional theory and allows to systematically improve density-potential inversion. [mehr]

Imaging emergent correlated phases in the strontium ruthenates

Microstructured Quantum Matter Seminar

Introduction to LabVIEW for PhD students (IMPRS UFAST skills course)

IMPRS UFAST skills course

Introduction to Quantum Optics (IMPRS UFAST focus course)

IMPRS UFAST focus course

Cascade of Fermi surface reconstructions inside the CDW phase of TiSe2

Microstructured Quantum Matter Seminar

Nonlinear phononics (IMPRS UFAST focus course)

IMPRS UFAST focus course

Communication & presentation in the academic context (IMPRS-UFAST Skills Course)

IMPRS-UFAST skills course

The Electroluminescence of Graphene

Max Planck Quantum Matter Seminar

Quantum Matter and the Multiverse of Engineered Topology

Max Planck Quantum Matter Seminar

Atoms and light - a pairing that will surprise you

Max Planck Quantum Matter Seminar

Topological materials for future technologies

Max Planck Quantum Matter Seminar

Chiral topological semimetals: From multifold fermions with long fermi-arcs to correlation induced topological phase transitions

Max Planck Quantum Matter Seminar

Tuning of charge density waves in correlated metals – New results and insights

Max Planck Quantum Matter Seminar

Solid State Physics (IMPRS UFAST core course)

IMPRS UFAST core course

Leadership and Career Development for PhD Students (IMPRS UFAST skills course)

IMPRS UFAST skills course

Quantum optics meets correlated electrons

Visualizing conical intersections with ultrafast X-Ray absorption spectroscopy: the signature of short hydrogen bonds

Twisted Transition Metal Dicalcogenides: Experimental Tests of Quantum Embedding Theories

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