Benjamin Stadtmüller
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View article: Transition from Optically Excited to Intrinsic Spin Polarization in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>WSe</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:math>
Transition from Optically Excited to Intrinsic Spin Polarization in Open
Layered 2D van der Waals materials, such as transition metal dichalcogenides, are promising for nanoscale spintronic and optoelectronic applications. Harnessing their full potential requires understanding both intrinsic transport and the d…
View article: Transition from Optically Excited to Intrinsic Spin Polarization in WSe$_2$
Transition from Optically Excited to Intrinsic Spin Polarization in WSe$_2$ Open
Layered 2D van der Waals materials, such as transition metal dichalcogenides, are promising for nanoscale spintronic and optoelectronic applications. Harnessing their full potential requires understanding both intrinsic transport and the d…
View article: Signatures of ballistic and diffusive transport in the time-dependent Kerr-response of magnetic materials
Signatures of ballistic and diffusive transport in the time-dependent Kerr-response of magnetic materials Open
We calculate the influence of diffusive and ballistic transport on ultrafast magnetization in thick metallic films. When only diffusive transport is present, gradients of magnetization in the material remain up to picosecond timescales. In…
View article: Time-resolved photoelectron spectroscopy at surfaces
Time-resolved photoelectron spectroscopy at surfaces Open
Light is a preeminent spectroscopic tool for investigating the electronic structure of surfaces. Time-resolved photoelectron spectroscopy has mainly been developed in the last 30 years. It is therefore not surprising that the topic was har…
View article: All optical excitation of spin polarization in d-wave altermagnets
All optical excitation of spin polarization in d-wave altermagnets Open
The recently discovered altermagnets exhibit collinear magnetic order with zero net magnetization but with unconventional spin-polarized d/g/i-wave band structures, expanding the known paradigms of ferromagnets and antiferromagnets. In add…
View article: Phase shift of coherent magnetization dynamics after ultrafast demagnetization in strongly quenched nickel thin films
Phase shift of coherent magnetization dynamics after ultrafast demagnetization in strongly quenched nickel thin films Open
The remagnetization process after ultrafast demagnetization can be described by relaxation mechanisms between the spin, electron, and lattice reservoirs. Thereby, collective spin excitations in form of spin waves and their angular momentum…
View article: Enhancing the dipole ring of hexagonal boron nitride nanomesh by surface alloying
Enhancing the dipole ring of hexagonal boron nitride nanomesh by surface alloying Open
Surface templating by electrostatic surface potentials is the least invasive way to design large-scale artificial nanostructures. However, generating sufficiently large potential gradients remains challenging. Here, we lay the groundwork f…
View article: Magnetic nutation: transient separation of magnetization from its angular momentum
Magnetic nutation: transient separation of magnetization from its angular momentum Open
For nearly 90 years, precession and relaxation processes have been thought to dominate magnetization dynamics. Only recently has it been considered that, on short time scales, an inertia-driven magnetization dynamics should become relevant…
View article: Revealing hidden spin polarization in centrosymmetric van der Waals materials on ultrafast timescales
Revealing hidden spin polarization in centrosymmetric van der Waals materials on ultrafast timescales Open
One of the key challenges for spintronic and quantum technologies is to achieve active control of the spin angular momentum of electrons in nanoscale materials on ultrafast, femtosecond timescales. While conventional ferromagnetic material…
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: Effect of iron thicknesses on spin transport in a Fe/Au bilayer system
Effect of iron thicknesses on spin transport in a Fe/Au bilayer system Open
This paper is concerned with a theoretical analysis of the behavior of optically excited spin currents in bilayer and multilayer systems of ferromagnetic and normal metals. As the propagation, control, and manipulation of the spin currents…
View article: Spin- and angle-resolved photoemission spectroscopy study of heptahelicene layers on Cu(111) surfaces
Spin- and angle-resolved photoemission spectroscopy study of heptahelicene layers on Cu(111) surfaces Open
It has been demonstrated previously that electrons interact differently with chiral molecules depending on their polarization. For enantiomeric pure monolayers of heptahelicene, opposite asymmetries in spin polarization were reported and a…
View article: Tailoring the ferromagnetic surface potential landscape by a templating two-dimensional metal-organic porous network
Tailoring the ferromagnetic surface potential landscape by a templating two-dimensional metal-organic porous network Open
Two-dimensional metal-organic porous networks (2D-MOPNs) have been identified as versatile nanoarchitectures to tailor surface electronic and magnetic properties on noble metals. In this context, we propose a protocol to redecorate a ferro…
View article: Exploring the third dimension in quantum confinement of surface electrons
Exploring the third dimension in quantum confinement of surface electrons Open
Quantum confinement of surface electrons in two-dimensional metal-organic porous networks offers a powerful route to engineer electronic states for emerging quantum and spintronic technologies at the molecular scale. To date, such confinem…
View article: Temperature-driven confinements of surface electrons and adatoms in a weakly interacting 2D organic porous network
Temperature-driven confinements of surface electrons and adatoms in a weakly interacting 2D organic porous network Open
Two-dimensional organic porous networks (2DOPNs) have opened new vistas for tailoring the physicochemical characteristics of metallic surfaces. These typically chemically bound nanoporous structures act as periodical quantum wells leading …
View article: Spin transport and magnetic proximity effect in CoFeB/normal metal/Pt trilayers
Spin transport and magnetic proximity effect in CoFeB/normal metal/Pt trilayers Open
We present a study of the damping and spin pumping properties of CoFeB/X/Pt systems with $\rm X=Al,Cr$ and $\rm Ta$. We show that the total damping of the CoFeB/Pt systems is strongly reduced when an interlayer is introduced independently …
View article: Coherent and incoherent magnons induced by strong ultrafast demagnetization in thin permalloy films
Coherent and incoherent magnons induced by strong ultrafast demagnetization in thin permalloy films Open
Understanding spin dynamics on femto- and picosecond timescales offers new opportunities for faster and more efficient spintronic devices. Here, we experimentally investigate the coherent spin dynamics after ultrashort laser excitation by …
View article: Competing signatures of intersite and interlayer spin transfer in the ultrafast magnetization dynamics
Competing signatures of intersite and interlayer spin transfer in the ultrafast magnetization dynamics Open
Optically driven intersite and interlayer spin transfer are individually known as the fastest processes for manipulating the spin order of magnetic materials on the sub 100 fs time scale. However, their competing influence on the ultrafast…
View article: Coherent magnetization dynamics in strongly quenched Ni thin films
Coherent magnetization dynamics in strongly quenched Ni thin films Open
The remagnetization process after ultrafast demagnetization can be described by relaxation mechanisms between the spin, electron, and lattice reservoirs. Thereby, collective spin excitations in form of spin waves and their angular momentum…
View article: Revealing Hidden Spin Polarization in Centrosymmetric van der Waals Materials on Ultrafast Timescales
Revealing Hidden Spin Polarization in Centrosymmetric van der Waals Materials on Ultrafast Timescales Open
One of the key challenges for spintronic and novel quantum technologies is to achieve active control of the spin angular momentum of electrons in nanoscale materials on ultrafast, femtosecond timescales. While conventional ferromagnetic ma…
View article: Laser‐Induced Creation of Antiferromagnetic 180‐Degree Domains in NiO/Pt Bilayers
Laser‐Induced Creation of Antiferromagnetic 180‐Degree Domains in NiO/Pt Bilayers Open
The antiferromagnetic order in heterostructures of NiO/Pt thin films can be modified by optical pulses. After the irradiation with laser light, the optically induced creation of antiferromagnetic domains can be observed by imaging the crea…
View article: Laser-induced Creation of antiferromagnetic 180-degree domains in NiO/Pt bilayers
Laser-induced Creation of antiferromagnetic 180-degree domains in NiO/Pt bilayers Open
We demonstrate how the antiferromagnetic order in heterostructures of NiO/Pt thin films can be modified by optical pulses. We irradiate our samples with laser light and identify an optically induced creation of antiferromagnetic domains by…
View article: Vectorial Electron Spin Filtering by an All-Chiral Metal–Molecule Heterostructure
Vectorial Electron Spin Filtering by an All-Chiral Metal–Molecule Heterostructure Open
The discovery of the electrons' chiral induced spin selective transmission (CISS) through chiral molecules has opened the pathway for manipulating spin transport in nonmagnetic structures on the nanoscale. CISS has predominantly been explo…
View article: Twisted light affects ultrafast demagnetization
Twisted light affects ultrafast demagnetization Open
Irradiation with an ultrashort laser pulse can completely destroy the magnetic order of ferromagnetic thin films on the femtosecond timescale. This phenomenon holds great potential for ultrafast spintronics and information processing and i…
View article: Coherent response of the electronic system driven by non-interfering laser pulses
Coherent response of the electronic system driven by non-interfering laser pulses Open
The strength of light–matter interaction in condensed matter is fundamentally linked to the orientation and oscillation strength of the materials’ optical transition dipoles. Structurally anisotropic materials, e.g., elongated molecules, e…
View article: Observation of optical coherence in a disordered metal-molecule interface by coherent optical two-dimensional photoelectron spectroscopy
Observation of optical coherence in a disordered metal-molecule interface by coherent optical two-dimensional photoelectron spectroscopy Open
Coherent multidimensional optical spectroscopy methods overcome some of the limitations found in their one-dimensional counterparts and allow us, for example, to resolve overlapped spectral features, to separate homogeneous and inhomogeneo…
View article: Indirect optical manipulation of the antiferromagnetic order of insulating NiO by ultrafast interfacial energy transfer
Indirect optical manipulation of the antiferromagnetic order of insulating NiO by ultrafast interfacial energy transfer Open
We report the ultrafast, (sub)picosecond reduction of the antiferromagnetic order of the insulating NiO thin film in a Pt/NiO bilayer. This reduction of the antiferromagnetic order is not present in pure NiO thin films after a strong optic…
View article: Atomic and mesoscopic structure of Dy-based surface alloys on noble metals
Atomic and mesoscopic structure of Dy-based surface alloys on noble metals Open
Surface alloys are a highly flexible class of low dimensional materials with the opportunity to tune and control the spin and charge carrier functionalities on the nanoscale. Here, we focus on the atomic and mesoscopic structural details o…