Matthias C. Hoffmann
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View article: Attosecond X-Ray Core-Level Chronoscopy of Aromatic Molecules
Attosecond X-Ray Core-Level Chronoscopy of Aromatic Molecules Open
Attosecond photoemission or photoionization delays are a unique probe of the structure and the electronic dynamics of matter. However, the spectral congestion of valence photoelectron spectra sets fundamental limits to the complexity of sy…
View article: Ultrafast low-temperature metal–insulator interface phonon dynamics and heat transport in a Pt/Gd3Fe5O12 heterostructure
Ultrafast low-temperature metal–insulator interface phonon dynamics and heat transport in a Pt/Gd3Fe5O12 heterostructure Open
Interfacial thermal and acoustic phenomena have an important role in quantum science and technology, including in spintronic and spincaloritronic materials and devices. Simultaneous measurements of the low-temperature thermal and acoustic …
View article: Tuning chirality amplitude at ultrafast timescales in chiral <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CsCuCl</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
Tuning chirality amplitude at ultrafast timescales in chiral Open
Chirality is a fundamental symmetry concept relevant to many scientific fields. It describes discrete states, i.e., left-handed, right-handed, or achiral. In contrast to this discrete classification, objects can be continuously distorted. …
View article: Terahertz-field activation of polar skyrons
Terahertz-field activation of polar skyrons Open
Unraveling collective modes arising from coupled degrees of freedom is crucial for understanding complex interactions in solids and developing new functionalities. Unique collective behaviors emerge when two degrees of freedom, ordered on …
View article: Terahertz field-induced giant symmetry modulations in a van der Waals antiferromagnet
Terahertz field-induced giant symmetry modulations in a van der Waals antiferromagnet Open
Strong-field terahertz (THz) excitations enable dynamic control over electronic, lattice and symmetry degrees of freedom in quantum materials. Here, we uncover pronounced terahertz-induced symmetry modulations and coherent phonon dynamics …
View article: Structural dynamics of laser-ionized cis-stilbene studied by ultrafast electron diffraction
Structural dynamics of laser-ionized cis-stilbene studied by ultrafast electron diffraction Open
Stilbene has been a model system for studying photoisomerization upon absorption of a UV photon. Although the dynamics of the first excited state have been investigated in great detail, the structural dynamics of cationic states remains la…
View article: Three-dimensional reconstruction of THz near-fields from a LiNbO$_3$ optical rectification source
Three-dimensional reconstruction of THz near-fields from a LiNbO$_3$ optical rectification source Open
Terahertz (THz) generation by optical rectification in LiNbO$_3$ (LN) is a widely used technique for generating intense THz radiation. The spatiotemporal characterization of THz pulses from these sources is currently limited to far-field m…
View article: Dynamics of nanoscale phase decomposition in laser ablation
Dynamics of nanoscale phase decomposition in laser ablation Open
Laser ablation is a process that bears both fundamental physics interest and has wide industrial applications. For decades, the lack of probes on the relevant time and length scales has prevented access to the highly nonequilibrium phase d…
View article: Tuning chirality amplitude at ultrafast timescales
Tuning chirality amplitude at ultrafast timescales Open
Chirality is a fundamental symmetry concept describing discrete states, i.e., left-handed, right-handed, or achiral, and existing at disparate scales and in many categories of scientific fields. Even though symmetry breaking is indispensab…
View article: Input to the ESPPU: The LUXE Experiment
Input to the ESPPU: The LUXE Experiment Open
This document presents an overview of LUXE (Laser Und XFEL Experiment), an experiment that will combine the high-quality and high-energy electron beam of the European XFEL with a high-intensity laser, to explore the uncharted terrain of st…
View article: Dynamic motion trajectory control with nanoradian accuracy for multi-element X-ray optical systems via laser interferometry
Dynamic motion trajectory control with nanoradian accuracy for multi-element X-ray optical systems via laser interferometry Open
The past decades have witnessed the development of new X-ray beam sources with brightness growing at a rate surpassing Moore’s law. Current and upcoming diffraction limited and fully coherent X-ray beam sources, including multi-bend achrom…
View article: Probing Electronic Coherence between Core-Level Vacancies at Different Atomic Sites
Probing Electronic Coherence between Core-Level Vacancies at Different Atomic Sites Open
The detailed understanding of electronic coherence in quantum systems requires measurements on the attosecond timescale. Attosecond x-ray pulses enable the study of electronic coherence in core-excited molecular systems. Here we report on …
View article: Electrochemical Control of the Ultrafast Lattice Response of a Layered Semimetal
Electrochemical Control of the Ultrafast Lattice Response of a Layered Semimetal Open
The unique layer‐stacking in two‐dimensional (2D) van der Waals materials facilitates the formation of nearly degenerate phases of matter and opens novel routes for the design of low‐power, reconfigurable functional materials. Electrochemi…
View article: Ultrafast structural dynamics of UV photoexcited <i>cis</i>,<i>cis</i>-1,3-cyclooctadiene observed with time-resolved electron diffraction
Ultrafast structural dynamics of UV photoexcited <i>cis</i>,<i>cis</i>-1,3-cyclooctadiene observed with time-resolved electron diffraction Open
An ultrafast electron diffraction study of the structural dynamics of cis , cis -1,3-cyclooctadiene has identified a ring stretching distortion as a new reaction coordinate as the molecule transitions from the excited state back to the gro…
View article: On ultrafast x-ray scattering methods for magnetism
On ultrafast x-ray scattering methods for magnetism Open
With the introduction of x-ray free electron laser sources around the world, new scientific approaches for visualizing matter at fundamental length and time-scales have become possible. As it relates to magnetism and ‘magnetic-type’ system…
View article: Deucravacitinib, an Oral, Selective, Allosteric Tyrosine Kinase 2 (TYK2) Inhibitor, in Patients With Moderate to Severe Scalp Psoriasis: Improvement in Scalp-Related Quality of Life and Symptoms in the Phase 3b/4 Multicenter, Randomized, Double-Blinded, Placebo-Controlled PSORIATYK SCALP Trial
Deucravacitinib, an Oral, Selective, Allosteric Tyrosine Kinase 2 (TYK2) Inhibitor, in Patients With Moderate to Severe Scalp Psoriasis: Improvement in Scalp-Related Quality of Life and Symptoms in the Phase 3b/4 Multicenter, Randomized, Double-Blinded, Placebo-Controlled PSORIATYK SCALP Trial Open
Introduction: PSORIATYK SCALP (NCT05478499)—an ongoing 52-week, phase 3b/4, multicenter, randomized, double-blinded, placebo-controlled trial—assesses the efficacy and safety of deucravacitinib in patients aged ≥18 years with moderate to s…
View article: Element-specific ultrafast lattice dynamics in FePt nanoparticles
Element-specific ultrafast lattice dynamics in FePt nanoparticles Open
Light–matter interaction at the nanoscale in magnetic alloys and heterostructures is a topic of intense research in view of potential applications in high-density magnetic recording. While the element-specific dynamics of electron spins is…
View article: Dynamics of Nanoscale Phase Decomposition in Laser Ablation
Dynamics of Nanoscale Phase Decomposition in Laser Ablation Open
Femtosecond laser ablation is a process that bears both fundamental physics interest and has wide industrial applications. For decades, the lack of probes on the relevant time and length scales has prevented access to the highly nonequilib…
View article: Element-specific ultrafast lattice dynamics in FePt nanoparticles
Element-specific ultrafast lattice dynamics in FePt nanoparticles Open
Light-matter interaction at the nanoscale in magnetic alloys and heterostructures is a topic of intense research in view of potential applications in high-density magnetic recording. While the element-specific dynamics of electron spins is…
View article: Observation of polarization density waves in SrTiO3
Observation of polarization density waves in SrTiO3 Open
The nature of the "failed" ferroelectric transition in SrTiO3 has been a long-standing puzzle in condensed matter physics. A compelling explanation is the competition between ferroelectricity and an instability with a mesoscopic modulation…
View article: Dynamic motion trajectory control with nanoradian accuracy for multi-element X-ray optical systems via laser interferometry
Dynamic motion trajectory control with nanoradian accuracy for multi-element X-ray optical systems via laser interferometry Open
The past decades have witnessed the development of new X-ray beam sources with brightness growing at a rate surpassing Moore's law. Current and upcoming diffraction limited and fully coherent X-ray beam sources, including multi-bend achrom…
View article: Dynamical decoding of the competition between charge density waves in a kagome superconductor
Dynamical decoding of the competition between charge density waves in a kagome superconductor Open
The kagome superconductor CsV$_3$Sb$_5$ hosts a variety of charge density wave (CDW) phases, which play a fundamental role in the formation of other exotic electronic instabilities. However, identifying the precise structure of these CDW p…
View article: Improved temporal resolution in ultrafast electron diffraction measurements through THz compression and time-stamping
Improved temporal resolution in ultrafast electron diffraction measurements through THz compression and time-stamping Open
We present an experimental demonstration of ultrafast electron diffraction (UED) with THz-driven electron bunch compression and time-stamping that enables UED probes with improved temporal resolution. Through THz-driven longitudinal bunch …
View article: Non-equilibrium pathways to emergent polar supertextures
Non-equilibrium pathways to emergent polar supertextures Open
Ultrafast stimuli can stabilize metastable states of matter inaccessible by equilibrium means. Establishing the spatiotemporal link between ultrafast excitation and metastability is crucial to understanding these phenomena. Here, we use si…