97 citations · 534 across the 25 of their papers we have counts for
25 papers
Beyond Classification: Task-Dependent Learnability under Privacy-Motivated Image Transformations
Leon Ranke, Wolfgang Hübner, Ronny Hug +2
Privacy-Enhancing Technologies (PETs) in computer vision often rely on noise or image perturbations to protect visual data while securely processing it, creating a trade-off betwee…
A Causally Grounded Taxonomy for Image Degradation Robustness Evaluation
Stefan Becker, Simon Weiss, Wolfgang Hübner +1
Image degradations can occur during acquisition, processing, and transmission, altering visual appearance and affecting downstream vision tasks. They are studied in several communi…
Gateway to all-optical spin switching in Heusler ferrimagnets: Pancharatnam-Berry tensor and magnetic moment ratio
G. P. Zhang, Y. Q. Liu, M. S. Si +4
All-optical spin switching (AOS) is a new phenomenon found in a small group of magnetic media, where a single laser pulse can switch spins from one direction to another, without as…
Quantifying the Complexity of Standard Benchmarking Datasets for Long-Term Human Trajectory Prediction
Ronny Hug, Stefan Becker, Wolfgang Hübner +1
Methods to quantify the complexity of trajectory datasets are still a missing piece in benchmarking human trajectory prediction models. In order to gain a better understanding of t…
Semi-classical approximation for the second harmonic generation in nanoparticles
Y. Pavlyukh, J. Berakdar, W. Hübner
Second harmonic generation by spherical nanoparticles is a non-local optical process that can also be viewed as the result of the non-linear response of the thin interface layer. T…
Optical response of small closed-shell sodium clusters
George Pal, Georgios Lefkidis, Hans Christian Schneider +1
Absorption spectra of closed-shell Na_2, Na_3+, Na_4, Na_5+, Na_6, Na_7+, and Na_8 clusters are calculated using a recently implemented conserving linear response method. In the fr…
Optical absorption spectra of finite systems from a conserving Bethe-Salpeter equation approach
George Pal, Yaroslav Pavlyukh, Wolfgang Hübner +1
We present a method for computing optical absorption spectra by means of a Bethe-Salpeter equation approach, which is based on a conserving linear response calculation for electron…
Conserving quasiparticle calculations for small metal clusters
George Pal, Yaroslav Pavlyukh, Hans Christian Schneider +1
A novel approach for GW-based calculations of quasiparticle properties for finite systems is presented, in which the screened interaction is obtained directly from a linear respons…
Substrate effects in the magneto-optical second-harmonic generation from first principles: Fe/Cu(001)
Torsten Andersen, W. Huebner
We compute the nonlinear optical response of an Fe monolayer placed on top of 1 to 4 monolayers of Cu(001). Our calculation is based on ab initio eigenstates of the slab, which are…
Time-reversal symmetry in nonlinear optics
M. Trzeciecki, W. Hübner
The applicability of time-reversal symmetry to nonlinear optics is discussed, both from macroscopic (Maxwell equations) and microscopic (quantum theoretical) point of view. We find…
First principles calculation of structural and magnetic properties for Fe monolayers and bilayers on W(110)
X. Qian, W. Hübner
Structure optimizations were performed for 1 and 2 monolayers (ML) of Fe on a 5 ML W(110) substrate employing the all-electron full-potential linearized augmented plane-wave (FP-LA…
Symmetry Analysis of Second Harmonic Generation at Surfaces of Antiferromagnets
M. Trzeciecki, A. Daehn, W. Huebner
Using group theory we classify the nonlinear magneto-optical response at low-index surfaces of fcc antiferromagnets, such as NiO. Structures consisting of one atomic layer are disc…
Nonlinear Magneto-Optics of freestanding Fe monolayers from first principles
J. P. Dewitz, W. Hübner
The nonlinear magneto-optical Kerr-effect (NOLIMOKE) is determined for freestanding Fe monolayers with several in-plane structures from first principles. Based on the theory of non…
Group-Theoretical Analysis of Second Harmonic Generation at (110) and (111) Surfaces of Antiferromagnets
M. Trzeciecki, W. Hübner
Extending our previous work we classify the nonlinear magneto-optical response at low index surfaces of fcc antiferromagnets, such as NiO. Antiferromagnetic bilayers are discussed…
Femtosecond electron and spin dynamics probed by nonlinear optics
G. P. Zhang, W. Hübner
A theoretical calculation is performed for the ultrafast spin dynamics in nickel using an exact diagonalization method. The present theory mainly focuses on a situation where the i…
The origin of the 90 degree magneto-optical Kerr rotation in CeSb
U. Pustogowa, W. Hubner, K. H. Bennemann
We calculate the linear magneto-optical Kerr rotation for CeSb in the near-infrared spectral range. Using an exact formula for large Kerr rotation angles and a simplified electroni…
Angular Dependences of Third Harmonic Generation from Microdroplets
J. Kasparian, B. Krämer, J. P. Dewitz +9
We present experimental and theoretical results for the angular dependence of third harmonic generation (THG) of water droplets in the micrometer range (size parameter )…
Magnetocrystalline Anisotropy Energy of Transition Metal Thin Films: A Non-perturbative Theory
A. Lessard, T. H. Moos, W. Huebner
The magnetocrystalline anisotropy energy E(anis) of free-standing monolayers and thin films of Fe and Ni is determined using two different semi-empirical schemes. Within a tight-bi…
Theory for Spin-Polarized Oscillations in Nonlinear Magneto-Optics due to Quantum Well States
T. A. Luce, W. Huebner, K. H. Bennemann
Using an electronic tight-binding theory we calculate the nonlinear magneto-optical response from an x-Cu/1Fe/Cu(001) film as a function of frequency and Cu overlayer thickness (x=…
Theory of Nonlinear Magneto-Optics
U. Pustogowa, T. A. Luce, W. Hubner +1
Nonlinear magneto-optics is a very sensitive fingerprint of the electronic, magnetic, and atomic structure of surfaces, interfaces, and thin ferromagnetic films. Analyzing theoreti…
Nonlinear Magneto-Optical Response of - and -Wave Superconductors
J. Schmalian, W. Hübner
The nonlinear magneto-optical response of - and -wave superconductors is discussed. We carry out the symmetry analysis of the nonlinear magneto-optical susceptibility in the…
Simple theory for spin-lattice relaxation in metallic rare earth ferromagnets
W. Hübner, K. H. Bennemann
The spin-lattice relaxation time is a key quantity both for the dynamical response of ferromagnets excited by laser pulses and as the speed limit of magneto-optical record…
Nonlinear magneto-optical Kerr spectra of thin ferromagnetic iron films calculated with ab initio theory
U. Pustogowa, W. Hubner, K. H. Bennemann
Using a spin-polarized full-potential linear muffin-tin orbital method we present calculations of the nonlinear magneto-optical Kerr effect for thin bcc Fe films within a slab geom…
Electronic Theory for the Nonlinear Magneto-Optical Response of Transition-Metals at Surfaces and Interfaces: Dependence of the Kerr-Rotation on Polarization and on the Magnetic Easy Axis
W. Hubner, K. H. Bennemann
We extend our previous study of the polarization dependence of the nonlinear optical response to the case of magnetic surfaces and buried magnetic interfaces. We calculate for the…