Markus E. Gruner
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View article: Terahertz carrier dynamics in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>SrTi</mml:mi> <mml:msub> <mml:mi mathvariant="normal">O</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> <mml:mo>/</mml:mo> <mml:mrow> <mml:mi>LaTi</mml:mi> <mml:msub> <mml:mi mathvariant="normal">O</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math> interfacial two-dimensional electron gases
Terahertz carrier dynamics in interfacial two-dimensional electron gases Open
A two-dimensional electron gas (2DEG) forms at the interface of complex oxides like SrTi O 3 (STO) and LaTi O 3 (LTO), despite each material having a low native conductivity, as a band and a Mott insulator, respectively. The in…
View article: Sub-nanosecond structural dynamics of the martensitic transformation in Ni-Mn-Ga
Sub-nanosecond structural dynamics of the martensitic transformation in Ni-Mn-Ga Open
Martensitic transformations drive a multitude of emerging applications, which range from high stroke actuation and, mechanocaloric refrigeration, to thermoelastic energy harvesting. All these applications benefit from faster transformation…
View article: High-statistics measurement of Collins and Sivers asymmetries for transversely polarised deuterons
High-statistics measurement of Collins and Sivers asymmetries for transversely polarised deuterons Open
New results are presented on a high-statistics measurement of Collins and Sivers asymmetries of charged hadrons produced in deep inelastic scattering of muons on a transversely polarised $^6$LiD target. The data were taken in 2022 with the…
View article: Final COMPASS results on the transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan process
Final COMPASS results on the transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan process Open
The COMPASS Collaboration performed measurements of the Drell-Yan process in 2015 and 2018 using a 190 GeV/c $π^{-}$ beam impinging on a transversely polarised ammonia target. Combining the data of both years, we present final results on t…
View article: Spatio-Temporal Electron Propagation Dynamics in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>Au</mml:mi></mml:math>/<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>Fe</mml:mi></mml:math>/<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mrow><mml:mi>Mg</mml:mi><mml:mi mathvariant="normal">O</mml:mi></mml:mrow></mml:math>(001) in Nonequilibrium: Revealing Single Scattering Events and the Ballistic Limit
Spatio-Temporal Electron Propagation Dynamics in //(001) in Nonequilibrium: Revealing Single Scattering Events and the Ballistic Limit Open
Understanding the microscopic spatio-temporal dynamics of nonequilibrium charge carriers in heterosystems promises optimization of process and device design towards desired energy transfer. Hot electron transport is governed by scattering …
View article: Concerted Mechanism of Carrier Dynamics in Laser‐Excited Fe<sub><i>n</i></sub>/(MgO)<sub><i>m</i></sub>(001) Heterostructures from Real‐Time Time‐Dependent DFT
Concerted Mechanism of Carrier Dynamics in Laser‐Excited Fe<sub><i>n</i></sub>/(MgO)<sub><i>m</i></sub>(001) Heterostructures from Real‐Time Time‐Dependent DFT Open
Using real‐time time‐dependent density functional theory (RT‐TDDFT), the electronic response of a Fe n /(MgO) m (001) ( n =1,3,5 and m =3,5,7) metal/insulator heterostructure to an optical excitation is calculated, considering laser freque…
View article: Annealing time, temperature, and field dependence of pinned magnetic moments in the collinear antiferromagnet PdMn
Annealing time, temperature, and field dependence of pinned magnetic moments in the collinear antiferromagnet PdMn Open
Annealing the collinear antiferromagnet PdMn with excess Pd in a magnetic field produces strongly pinned magnetic moments in the annealing field direction. This behavior can be understood with the help of the magnetic-field-biased diffusio…
View article: A multi-stage, first-order phase transition in LaFe11.8Si1.2: Interplay between the structural, magnetic, and electronic degrees of freedom
A multi-stage, first-order phase transition in LaFe11.8Si1.2: Interplay between the structural, magnetic, and electronic degrees of freedom Open
Alloys with a first-order magnetic transition are central to solid-state refrigeration technology, sensors and actuators, or spintronic devices. The discontinuous nature of the transition in these materials is a consequence of the coupling…
View article: Spatio-Temporal Electron Propagation Dynamics in Au/Fe/MgO(001) in nonequilibrium: Revealing Single Scattering Events and the Ballistic Limit
Spatio-Temporal Electron Propagation Dynamics in Au/Fe/MgO(001) in nonequilibrium: Revealing Single Scattering Events and the Ballistic Limit Open
Understanding the microscopic spatio-temporal dynamics of nonequilibrium charge carriers in heterosystems promises optimization of process and device design towards desired energy transfer. Hot electron transport is governed by scattering …
View article: The Premartensite and Martensite in Fe50Rh50 System
The Premartensite and Martensite in Fe50Rh50 System Open
Metallic/intermetalic materials with BCC structures hold an intrinsic instability due to phonon softening along [110] dirrection, causing BCC to lower-symmetry phases transformation when the BCC structures are thermally or mechanically str…
View article: Local magnetic and geometric structure in Mn-doped La(Fe,Si)13
Local magnetic and geometric structure in Mn-doped La(Fe,Si)13 Open
Magnetic cooling has the potential to replace conventional gas compression refrigeration. Materials such as La(Fe,Si)$_{13}$ exhibit a sizeable first-order magnetocaloric effect, and it is possible to tailor the phase transition towards ro…
View article: Annealing time, temperature, and field dependence of pinned magnetic moments in the collinear antiferromagnet PdMn
Annealing time, temperature, and field dependence of pinned magnetic moments in the collinear antiferromagnet PdMn Open
Magnetic annealing of the collinear antiferromagnet PdMn with excess Pd produces strongly pinned magnetic moments in the annealing field direction. This behaviour can be understood with the help of the magnetic-field-biased diffusion model…
View article: Emergence of net magnetization by magnetic-field-biased diffusion in antiferromagnetic L1$_0$ NiMn
Emergence of net magnetization by magnetic-field-biased diffusion in antiferromagnetic L1$_0$ NiMn Open
NiMn is a collinear antiferromagnet with high magneto crystalline anisotropy ($K_2=-9.7\times10^5\;\text{J m}^{-3}$). Through magnetic annealing of NiMn with excess Ni, strongly pinned magnetic moments emerge due to an imbalance in the dis…
View article: Effective decoupling of ferromagnetic sublattices by frustration in Heusler alloys
Effective decoupling of ferromagnetic sublattices by frustration in Heusler alloys Open
Magnetic frustration in ferromagnetic metallic systems is unusual due to the long-range and symmetric nature of the exchange interactions. In this work we prove that it is possible to obtain a highly frustrated ferromagnetic phase in a mul…
View article: Anisotropic carrier dynamics in a laser-excited Fe$_{1}$/(MgO)$_{3}$(001) heterostructure from real-time time-dependent DFT
Anisotropic carrier dynamics in a laser-excited Fe$_{1}$/(MgO)$_{3}$(001) heterostructure from real-time time-dependent DFT Open
The interaction of a femtosecond optical pulse with a Fe$_{1}$/(MgO)$_{3}$(001) metal/oxide heterostructure is investigated using time-dependent density functional theory (TDDFT) calculations in the real-time domain. We systematically stud…
View article: Impact of local arrangement of Fe and Ni on the phase stability and magnetocrystalline anisotropy in Fe-Ni-Al Heusler alloys
Impact of local arrangement of Fe and Ni on the phase stability and magnetocrystalline anisotropy in Fe-Ni-Al Heusler alloys Open
On the basis of density functional calculations, we report on a comprehensive study of the influences of atomic arrangement and Ni substitution for Al on the ground state structural and magnetic properties for Fe$_2$Ni$_{1+x}$Al$_{1-x}$ He…
View article: Electronic and Vibrational Properties of Fe2NiAl and Co2NiAl Full Heusler Alloys: A First-Principles Comparison
Electronic and Vibrational Properties of Fe2NiAl and Co2NiAl Full Heusler Alloys: A First-Principles Comparison Open
In this work, we report on a systematic first-principles study of the structural, electronic, vibrational and thermodynamic properties of the cubic Fe2NiAl and tetragonally distorted Co2NiAl full Heusler compounds. We discuss systematicall…
View article: Electronic and Vibrational Properties of Fe2NiAl and Co2NiAl Full Heusler Alloys: A First-Principles Comparison
Electronic and Vibrational Properties of Fe2NiAl and Co2NiAl Full Heusler Alloys: A First-Principles Comparison Open
In this work, we report on a systematic first-principles study of the structural, electronic, vibrational and thermodynamic properties of the cubic Fe2NiAl and tetragonally distorted Co2NiAl full Heusler compounds. We discuss systematicall…
View article: Effect of lattice excitations on transient near-edge x-ray absorption spectroscopy
Effect of lattice excitations on transient near-edge x-ray absorption spectroscopy Open
Time-dependent and constituent-specific spectral changes in soft near edge X-ray spectroscopy (XAS) of an [Fe/MgO]$_8$ metal/insulator heterostructure upon laser excitation are analyzed at the O K-edge with picosecond time resolution. The …
View article: Impact of local arrangement of Fe and Ni on the phase stability and\n magnetocrystalline anisotropy in Fe-Ni-Al Heusler alloys
Impact of local arrangement of Fe and Ni on the phase stability and\n magnetocrystalline anisotropy in Fe-Ni-Al Heusler alloys Open
On the basis of density functional calculations, we report on a comprehensive\nstudy of the influences of atomic arrangement and Ni substitution for Al on the\nground state structural and magnetic properties for Fe$_2$Ni$_{1+x}$Al$_{1-x}$\…
View article: Impact of local arrangement of Fe and Ni in Fe-Ni-Al Heusler alloys on the phase stability and magnetocrystalline anisotropy
Impact of local arrangement of Fe and Ni in Fe-Ni-Al Heusler alloys on the phase stability and magnetocrystalline anisotropy Open
On the basis of the density functional calculations in combination with the supercell approach, we report on a complete study of the influences of atomic arrangement and Ni substitution for Al on the ground state structural and magnetic pr…
View article: Theoretical description of optical and x-ray absorption spectra of MgO including many-body effects
Theoretical description of optical and x-ray absorption spectra of MgO including many-body effects Open
Here we report the optical and x-ray absorption (XAS) spectra of the wide-band-gap oxide MgO using density functional theory (DFT) and many-body perturbation theory (MBPT). Our comprehensive study of the electronic structure shows that whi…
View article: Interface-related magnetic and vibrational properties in Fe/MgO heterostructures from nuclear resonant spectroscopy and first-principles calculations
Interface-related magnetic and vibrational properties in Fe/MgO heterostructures from nuclear resonant spectroscopy and first-principles calculations Open
We combine ⁵⁷Fe Mössbauer spectroscopy and ⁵⁷Fe nuclear resonant inelastic x-ray scattering (NRIXS) on nanoscale polycrystalline [bcc−⁵⁷Fe/MgO] multilayers with various Fe-layer thicknesses and layer-resolved density-functional-theory (DFT…
View article: Effect of lattice excitations on transient near edge X-ray absorption\n spectroscopy
Effect of lattice excitations on transient near edge X-ray absorption\n spectroscopy Open
Time-dependent and constituent-specific spectral changes in soft near edge\nX-ray spectroscopy (XAS) of an [Fe/MgO]$_8$ metal/insulator heterostructure\nupon laser excitation are analyzed at the O K-edge with picosecond time\nresolution. T…
View article: Modeling the spectroscopic fine structures of pump-induced changes in time-resolved soft x-ray absorption spectroscopy of an Fe/MgO multilayer
Modeling the spectroscopic fine structures of pump-induced changes in time-resolved soft x-ray absorption spectroscopy of an Fe/MgO multilayer Open
Time-dependent and constituent-specific spectral changes in transient soft x-ray spectroscopy of an [Fe/MgO]$_8$ metal/insulator heterostructure upon laser excitation are analyzed at the Fe L$_3$-edge and the O K-edge with picosecond and f…
View article: Microscopic nonequilibrium energy transfer dynamics in a photoexcited metal/insulator heterostructure
Microscopic nonequilibrium energy transfer dynamics in a photoexcited metal/insulator heterostructure Open
The element specificity of soft X-ray spectroscopy makes it an ideal tool for\nanalyzing the microscopic origin of ultrafast dynamics induced by localized\noptical excitation in metal-insulator heterostructures. Using [Fe/MgO]$_n$ as a\nmo…
View article: Role of the exchange-correlation functional on the structural, electronic and optical properties of cubic and tetragonal SrTiO$_3$ including many-body effects
Role of the exchange-correlation functional on the structural, electronic and optical properties of cubic and tetragonal SrTiO$_3$ including many-body effects Open
SrTiO$_3$ is a model perovskite compound with unique properties and technological relevance. At 105 K it undergoes a transition from a cubic to a tetragonal phase with characteristic antiferrodistortive rotations of the TiO$_6$ octahedra. …