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View article: Insights into the laser-assisted photoelectric effect from solid-state surfaces
Insights into the laser-assisted photoelectric effect from solid-state surfaces Open
Photoemission from a solid surface provides a wealth of information about its electronic structure and dynamic evolution. Ultrafast pump-probe experiments offer real-time access to photon-surface interactions and the resulting electron dyn…
View article: Chirality in the Kagome Metal CsV$_3$Sb$_5$
Chirality in the Kagome Metal CsV$_3$Sb$_5$ Open
Using x-ray photoelectron diffraction (XPD) and angle-resolved photoemission spectroscopy, we study photoemission intensity changes related to changes in the geometric and electronic structure in the kagome metal CsV$_3$Sb$_5$ upon transit…
View article: Anomalous 4$f$ fine structure in TmSe$_{1-x}$Te$_x$ across the metal-insulator transition
Anomalous 4$f$ fine structure in TmSe$_{1-x}$Te$_x$ across the metal-insulator transition Open
Hybridization between localized 4$f$ and itinerant 5$d$6$s$ states in heavy fermion compounds is a well-studied phenomenon and commonly captured by the paradigmatic Anderson model. However, the investigation of additional electronic intera…
View article: Real-time observation of non-equilibrium phonon-electron energy and angular momentum flow in laser-heated nickel
Real-time observation of non-equilibrium phonon-electron energy and angular momentum flow in laser-heated nickel Open
Identifying the microscopic nature of non-equilibrium energy transfer mechanisms among electronic, spin, and lattice degrees of freedom is central to understanding ultrafast phenomena such as manipulating magnetism on the femtosecond times…
View article: Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO <sub>2</sub>
Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO <sub>2</sub> Open
Altermagnets are an emerging elementary class of collinear magnets. Unlike ferromagnets, their distinct crystal symmetries inhibit magnetization while, unlike antiferromagnets, they promote strong spin polarization in the band structure. T…
View article: Multi-Mode Front Lens for Momentum Microscopy: Part II Experiments
Multi-Mode Front Lens for Momentum Microscopy: Part II Experiments Open
We have experimentally demonstrated different operating modes for the front lenses of the momentum microscopes described in Part I. Measurements at energies from vacuum UV at a high-harmonic generation (HHG)-based source to the soft and ha…
View article: New insights into the laser-assisted photoelectric effect from solid-state surfaces
New insights into the laser-assisted photoelectric effect from solid-state surfaces Open
Photoemission from a solid surface provides a wealth of information about its electronic structure and dynamic evolution. Ultrafast pump-probe experiments offer real-time access to photon-surface interactions and the resulting electron dyn…
View article: Real-time observation of phonon-electron energy and angular momentum flow in laser-heated nickel
Real-time observation of phonon-electron energy and angular momentum flow in laser-heated nickel Open
Identifying the microscopic nature of non-equilibrium energy transfer mechanisms among electronic, spin and lattice degrees of freedom is central for understanding ultrafast phenomena such as manipulating magnetism on the femtosecond times…
View article: Out-of-equilibrium charge redistribution data in a copper-oxide based superconductor by time-resolved X-ray photoelectron spectroscopy
Out-of-equilibrium charge redistribution data in a copper-oxide based superconductor by time-resolved X-ray photoelectron spectroscopy Open
This dataset was measured using a momentum microscope by time-resolved X-ray photoelectron spectroscopy (XPS) on the prototypical high-temperature superconductor: optimally doped BSCCO at FEL FLASH, DESY in Hamburg. With time-resolved XPS,…
View article: Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO$_2$
Observation of time-reversal symmetry breaking in the band structure of altermagnetic RuO$_2$ Open
Altermagnets are an emerging third elementary class of magnets. Unlike ferromagnets, their distinct crystal symmetries inhibit magnetization while, unlike antiferromagnets, they promote strong spin polarization in the band structure. The c…
View article: Multiplex movie of concerted rotation of molecules on a 2D material
Multiplex movie of concerted rotation of molecules on a 2D material Open
Function is dynamic and originates at atomic interfaces. Combining the degrees of freedom of molecules ( 1,2 ) with the peculiar properties of 2D quantum materials ( 3,4,5 ) can create novel functionality ( 6,7 ). Here, we report the manip…
View article: Multispectral time-resolved energy–momentum microscopy using high-harmonic extreme ultraviolet radiation
Multispectral time-resolved energy–momentum microscopy using high-harmonic extreme ultraviolet radiation Open
A 790-nm-driven high-harmonic generation source with a repetition rate of 6 kHz is combined with a toroidal-grating monochromator and a high-detection-efficiency photoelectron time-of-flight momentum microscope to enable time- and momentum…
View article: Multispectral time-resolved energy-momentum microscopy using high-harmonic extreme ultraviolet radiation
Multispectral time-resolved energy-momentum microscopy using high-harmonic extreme ultraviolet radiation Open
A 790-nm-driven high-harmonic generation source with a repetition rate of 6 kHz is combined with a toroidal-grating monochromator and a high-detection-efficiency photoelectron time-of-flight momentum microscope to enable time- and momentum…
View article: Ultrafast MHz‐Rate Burst‐Mode Pump–Probe Laser for the FLASH FEL Facility Based on Nonlinear Compression of ps‐Level Pulses from an Yb‐Amplifier Chain
Ultrafast MHz‐Rate Burst‐Mode Pump–Probe Laser for the FLASH FEL Facility Based on Nonlinear Compression of ps‐Level Pulses from an Yb‐Amplifier Chain Open
The Free‐Electron Laser (FEL) FLASH offers the worldwide still unique capability to study ultrafast processes with high‐flux, high‐repetition rate extreme ultraviolet, and soft X‐ray pulses. The vast majority of experiments at FLASH are of…
View article: Ultrafast MHz-rate burst-mode pump-probe laser for the FLASH FEL\n facility based on nonlinear compression of ps-level pulses from an\n Yb-amplifier chain
Ultrafast MHz-rate burst-mode pump-probe laser for the FLASH FEL\n facility based on nonlinear compression of ps-level pulses from an\n Yb-amplifier chain Open
The Free-Electron Laser (FEL) FLASH offers the worldwide still unique capability to study ultrafast processes with high-flux, high-repetition rate XUV and soft X-ray pulses. The vast majority of experiments at FLASH are of pump-probe type.…
View article: Suppression of the vacuum space-charge effect in fs-photoemission by a retarding electrostatic front lens
Suppression of the vacuum space-charge effect in fs-photoemission by a retarding electrostatic front lens Open
The performance of time-resolved photoemission experiments at fs-pulsed photon sources is ultimately limited by the e–e Coulomb interaction, downgrading energy and momentum resolution. Here, we present an approach to effectively suppress s…