@article{66942,
  abstract     = {{Raman imaging, based on incoherent spontaneous Raman scattering (SR) or coherent techniques such as broadband coherent anti-Stokes Raman spectroscopy (BCARS), is a powerful tool for visualizing local lattice distortions. It can thus be employed, e.g., to identify and visualize ferroelectric (FE) domain walls (DWs). While SR-based DW imaging relies on small changes in the intensity or position of Raman peaks at the DW, BCARS measurements may detect DW signatures with a drastically increased contrast and orders of magnitude faster imaging speed. However, while SR-based contrasts can be predicted from existing models, the increased DW contrasts in BCARS remain poorly understood. In this work, we develop a first-principles approach for the simulation of CARS spectra to investigate the origin of this BCARS signal contrast at periodically poled stoichiometric lithium niobate (sPPLN) DWs. Combining these atomistic simulations with strain modeling allows us to explore how strain affects the CARS signal generation at FE DWs. We then apply polarization-sensitive BCARS to image sPPLN DWs for different polarization configurations. Our results reveal additional Raman peaks specific to the DWs across all investigated polarization combinations, yielding a strong DW-to-bulk contrast that enables in situ identification and localization of DWs in two-dimensional BCARS maps. This study demonstrates the practical utility of polarization-sensitive BCARS for fast DW imaging and provides fundamental insights into the BCARS contrast mechanism in FE materials, both in strained regions and in the unstrained bulk.}},
  author       = {{Buschbeck, Robin and Pionteck, Mike N. and Herrmann, Naomi and Rüsing, Michael and Kehr, Susanne C. and Sanna, Simone and Eng, Lukas M.}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{3}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Ab initio modeling and experimental analysis of contrast in broadband coherent anti-Stokes Raman spectroscopy: A case study on ferroelectric domain walls}}},
  doi          = {{10.1103/m1xq-rlft}},
  volume       = {{114}},
  year         = {{2026}},
}

@article{66941,
  abstract     = {{Understanding and controlling the optical properties of lithium niobate tantalate solid solutions (LiNb1−xTaxO3, 0 ≤ x ≤ 1) is essential for their use in integrated quantum and nonlinear photonics. This material system allows for composition-dependent tuning of key optical parameters such as refractive indices and birefringence. While lithium niobate (LiNbO3, x = 0) and lithium tantalate (LiTaO3, x = 1) are well characterized, reliable dispersion data for intermediate compositions remain scarce, limiting accurate modeling and refractive index engineering. Here, we address this gap by experimentally determining the ordinary and extraordinary refractive indices of LiNb1−xTaxO3 over the spectral range of 405 − 1550 nm using an interferometric technique. As a result, composition-dependent refractive index dispersion and Sellmeier coefficients are derived and discussed in relation to previous studies and structural aspects. In particular, a monotonic decrease of the ordinary refractive index with increasing Tantalum concentration is observed. The present Sellmeier coefficients further allow discussion of zero birefringence dispersion and its composition dependence in lithium niobate tantalate.}},
  author       = {{Hehemann, Tobias and Dömer, Niklas and Sauerwein, Felix and Rüsing, Michael and Ganschow, Steffen and Imlau, Mirco}},
  issn         = {{2159-3930}},
  journal      = {{Optical Materials Express}},
  number       = {{7}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Composition-dependent refractive index dispersion and Sellmeier coefficients for lithium niobate tantalate solid solutions}}},
  doi          = {{10.1364/ome.592118}},
  volume       = {{16}},
  year         = {{2026}},
}

@article{66944,
  abstract     = {{The comprehensive description of both the electrical transport along conductive domain walls in lithium niobate single crystals and the charge injection at the interfacing metal electrodes, emerged to be a complex challenge. Recently, a heuristic evaluation allowed to postulate the “𝑅⁢2⁢𝐷⁢2
” equivalent-circuit model (consisting of two parallel resistor-diode pairs) to appropriately match the dc current-voltage (I-V) characteristics. Here, we carefully revisit the interfacial electrical behavior, i.e., the diode part of the equivalent circuit model, since many more processes beyond the diode-related electron hopping transport (HT) assumed so far, may concurrently occur, such as thermionic emission (TE), Fowler-Nordheim tunneling (FNT), space-charge limited conduction (SCLC), and others. The “𝑅⁢2⁢𝐷⁢2
” model thus needs to be generalized into an “𝑅⁢2⁢𝑋⁢2
” circuit model (with 𝑋
= HT, TE, FNT, SCLC, and others) to fit to the experimental data. Moreover, to check for the best I-V curve fitting to the different theories, we apply a higher-harmonic DW current-contribution analysis, i.e., an ac I-V inspection, that allows us to discriminate between all these possible models with much higher precision than from pure dc I-V curve fitting. Both the ac and dc analysis yield consistent results, finding that the FNT model accounts best for the domain-wall/electrode junctions investigated here.}},
  author       = {{Zahn, Manuel and Beyreuther, Elke and Kiseleva, Iuliia and Ratzenberger, Julius and Rüsing, Michael and Eng, Lukas M.}},
  issn         = {{2469-9950}},
  journal      = {{Physical Review B}},
  number       = {{4}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Domain-wall/metal-electrode injection barrier in lithium niobate: Fowler-Nordheim tunneling fits best}}},
  doi          = {{10.1103/3q26-4c3g}},
  volume       = {{114}},
  year         = {{2026}},
}

@article{65359,
  abstract     = {{<jats:p>Lithium niobate sees widespread use in nonlinear and quantum optical devices, such as for sum- and difference-frequency generation or spontaneous parametric downconversion. In lithium niobate waveguides, nonlinear optical processes are often limited by the so-called photorefractive effect, which limits the maximum input or output powers and impacts the nonlinear spectral response. Therefore, strategies for the management of photorefractive damage are a key consideration in device design. Usually, the photorefractive damage threshold, i.e., the maximal permissible operating power, can be increased by high-temperature operation of devices. This approach, however, is not applicable in cryogenic environments, which may be required for specialized applications. To better understand the impact of photorefraction in nonlinear optical applications, we study the impact of photorefraction on the phase-matching spectra of two nonlinear-optical sum-frequency generation experiments at (1) high temperatures and (2) cryogenic temperatures. Furthermore, we present an approach to reduce the impact of photorefraction, which is compatible with cryogenic operation. This comprises an auxiliary light source, propagating in the same waveguide, which is used to restore phase-matching spectra impacted by photorefraction, as well as reduce pyroelectric effects. Our work provides an alternative route to photorefraction management applicable to cryogenic environments, as well as in situations with tight energy budgets, such as space applications.</jats:p>}},
  author       = {{Lange, Nina Amelie and Pollmann, René and Rüsing, Michael and Stefszky, Michael and Protte, Maximilian and Ricken, Raimund and Padberg, Laura and Eigner, Christof and Bartley, Tim and Silberhorn, Christine}},
  issn         = {{0021-8979}},
  journal      = {{Journal of Applied Physics}},
  number       = {{13}},
  publisher    = {{AIP Publishing}},
  title        = {{{Photorefraction management in lithium niobate waveguides: High-temperature vs cryogenic solutions}}},
  doi          = {{10.1063/5.0324002}},
  volume       = {{139}},
  year         = {{2026}},
}

@inbook{66947,
  author       = {{Büker, Petra and Fernhomberg, Hannah Marie}},
  booktitle    = {{Partizipative Forschung mit Kindern in der Grundschule. Ethische Herausforderungen und Potenziale}},
  editor       = {{Velten, Katrin and Hüpping, Birgit}},
  isbn         = {{9783781527584}},
  pages        = {{91--106}},
  publisher    = {{Klinkhardt}},
  title        = {{{Kinder als Forschende: Sichtweisen von Grundschulkindern auf ethische Aspekte ihrer eigenen Sozialforschung}}},
  year         = {{2026}},
}

@inbook{66940,
  author       = {{Janus, Richard}},
  booktitle    = {{Handbuch performative Fachdidaktiken}},
  editor       = {{del Valle, Viktoria and Eilerts, Katja and Hinz, Felix and Hornäk, Sara and Mitterer, Nicola and Schroeter-Wittke, Harald}},
  isbn         = {{9783825266912}},
  pages        = {{318--323}},
  publisher    = {{Vandenhoeck&Ruprecht}},
  title        = {{{Evangelische Religionslehre}}},
  doi          = {{10.36198/9783838566917}},
  year         = {{2026}},
}

@inproceedings{66966,
  author       = {{Mukherjee, Sourav and Matthiesen, Bho and Dekorsy, Armin and Popovski, Petar}},
  booktitle    = {{2026 IEEE International Conference on Communications Workshops (ICC Workshops)}},
  publisher    = {{IEEE}},
  title        = {{{Dynamic Downlink-Uplink for Spectrum Sharing in Non-Terrestrial Networks}}},
  doi          = {{10.1109/iccworkshops63917.2026.11586455}},
  year         = {{2026}},
}

@inproceedings{66967,
  author       = {{Matthiesen, Bho and Dekorsy, Armin and Popovski, Petar}},
  booktitle    = {{2025 IEEE Globecom Workshops (GC Wkshps)}},
  publisher    = {{IEEE}},
  title        = {{{Resilient Radio Access Networks: AI and the Unknown Unknowns}}},
  doi          = {{10.1109/gcwkshps68340.2025.11591166}},
  year         = {{2026}},
}

@inbook{67014,
  abstract     = {{<jats:p>Eine zentrale Herausforderung in der Professionalisierung pädagogischer Fach- und Lehrkräfte besteht in der Relation von eher theoretischen und praktischen Ausbildungsbestandteilen. Beispielsweise fühlen sich angehende Lehrkräfte durch ihr Studium häufig nicht ausreichend auf die beruflichen Anforderungen vorbereitet. Daher wird verstärkt versucht, Curricula von Ausbildungs- und Studiengängen deutlicher an den tatsächlichen professionellen Handlungsanforderungen zu orientieren und auch in frühen Ausbildungsphasen verstärkt Elemente beruflicher Praxis zu integrieren. 
Dieser Band nimmt die Handlungsorientierung in der Ausbildung von Lehrkräften und pädagogischen Fachkräften theoretisch-konzeptionell sowie empirisch in den Blick. Zudem werden innovative Lehransätze aufgezeigt, die den Fokus auf eine Stärkung einer solchen Handlungsorientierung legen, z.B. durch simulationsbasierte Lern- und Prüfungsformate.
Es handelt sich um den zweiten Band der Reihe Paderborner Beiträge zur Bildungsforschung und Lehrkräftebildung, die von der PLAZ – Professional School of Education herausgegeben wird.</jats:p>}},
  author       = {{Niesen, Heike and Rumlich, Dominik}},
  booktitle    = {{Handlungsorientierung in der Ausbildung von Lehrkräften und pädagogischen Fachkräften. Konzeptionen und Forschungsperspektiven}},
  editor       = {{Vogelsang, Christoph and Grotegut, Lea and Bruns, Julia and Riese, Josef and Fechner, Sabine}},
  isbn         = {{9783818801052}},
  pages        = {{85--101}},
  publisher    = {{Waxmann}},
  title        = {{{Forschendes Lernen im Praxissemester des Faches Englisch}}},
  doi          = {{10.31244/9783818851057}},
  year         = {{2026}},
}

@phdthesis{67018,
  author       = {{Bielak, Christian Roman}},
  isbn         = {{978-3-8191-0838-9}},
  publisher    = {{Shaker}},
  title        = {{{Methode zur ganzheitlichen Prognose der Fügbarkeit entlang der Prozesskette am Beispiel des Clinchens}}},
  doi          = {{DOI 10.2370/9783819108389}},
  year         = {{2026}},
}

@article{67015,
  author       = {{Albus, Vanessa}},
  journal      = {{ZDPE}},
  pages        = {{3--7}},
  publisher    = {{C.C.Buchner}},
  title        = {{{Simone de Beauvoir im Kanon}}},
  volume       = {{3}},
  year         = {{2026}},
}

@article{67016,
  author       = {{Albus, Vanessa}},
  journal      = {{ZDPE}},
  pages        = {{81--99}},
  title        = {{{Simone de Beauvoir als Lehrerin und ihr philosophiedidaktisches Potenzial}}},
  volume       = {{3}},
  year         = {{2026}},
}

@book{67017,
  editor       = {{Albus, Vanessa}},
  title        = {{{Simone de Beauvoir, Zeitschrift für Didaktik der Philosophie und Ethik}}},
  volume       = {{3}},
  year         = {{2026}},
}

@article{67066,
  author       = {{Kullmer, Gunter and Krome, Sven and Ostwald, Richard}},
  issn         = {{0013-7944}},
  journal      = {{Engineering Fracture Mechanics}},
  publisher    = {{Elsevier BV}},
  title        = {{{A new approach for the formulaic description of the crack growth rate curve for long cracks in aluminum alloys}}},
  doi          = {{10.1016/j.engfracmech.2026.112568}},
  volume       = {{345}},
  year         = {{2026}},
}

@unpublished{67088,
  abstract     = {{We prove quantitative lower bounds on the semidefinite extension complexity of the set of separable quantum states on $\mathbb{C}^d\otimes\mathbb{C}^d$. We consider semidefinite programs (SDPs) that approximate the maximum acceptance probability of a measurement over separable states, the optimization problem underlying QMA(2). In the extended-formulation model of Harrow, Natarajan, and Wu (HNW), all measurements share a common feasible region and an objective-independent embedding of product states that exactly reproduces their acceptance probabilities. For every $0<θ<2/7$, there are constants $c_θ,a_θ>0$ such that, for sufficiently large $d$, any such SDP with uniform additive error $0<a\le a_θ$ has size at least $d^{c_θ\min\{a^{-1/3},d^θ\}}$. The bound applies at sufficiently small constant error, is superpolynomial in $d$ whenever $a=o(1)$, and becomes $d^{Ω(d^θ)}$ when $a\le d^{-3θ}$, improving HNW's quasipolynomial bound at inverse- square error. The same bound holds for any SDP-representable convex set of states that contains all separable states and lies within trace distance $a$ of them, giving a quantitative counterpart to Fawzi's theorem that the separable set has no exact semidefinite representation. Our proof combines the quantitative pseudo-density theorem of Lee, Raghavendra, and Steurer with explicit block-positive operators and Chebyshev amplification. Our main results are supported by Lean proofs.}},
  author       = {{Gharibian, Sevag and Hecht, Carsten and Rudolph, Dorian}},
  booktitle    = {{arXiv:2609.09033}},
  title        = {{{Semidefinite extension complexity of the separable set, with applications to approximate disentanglers}}},
  year         = {{2026}},
}

@unpublished{67136,
  abstract     = {{A weighted dynamical version $\mathbf{Z}_f$ of the classical Ihara zeta function is presented on connected finite regular graphs, expressed in terms of weighted periodic orbit data. We establish its meromorphic continuation, with poles given by the resonances of the associated non-backtracking transfer operator acting on a suitable Banach space, and compute its residues. At simple spectral parameters, the residue of $\mathbf{Z}_f$ is identified with the invariant Ruelle distribution on the graph phase space. Combining this result with a relation obtained by Arends-Palmirotta, we further derive Patterson-Sullivan and Wigner residue formulae. This provides a finite-graph analogue of residue formulae for weighted dynamical zeta functions for geodesic flow on rank one locally symmetric spaces, in the spirit of Schütte-Barkhofen-Weich.}},
  author       = {{Palmirotta, Guendalina}},
  pages        = {{53}},
  title        = {{{Residues of weighted dynamical Ihara zeta functions on finite regular graphs}}},
  year         = {{2026}},
}

@book{67137,
  author       = {{Garske, Volker}},
  isbn         = {{978-3-643-15874-1}},
  publisher    = {{LIT}},
  title        = {{{Josef, der Despot. Theologische und didaktische Reflexionen über die Verklärung eines biblischen Helden in aktuellen Materialien für den Religionsunterricht }}},
  year         = {{2026}},
}

@article{67139,
  author       = {{Schmitt-Richter, Lena Katharina and Wüllner Öztüter, Sabrina and Ebeling, Muna}},
  issn         = {{0176-179X}},
  journal      = {{PädagogikUNTERRICHT. Die Fachzeitschrift für die pädagogische Fächergruppe.}},
  number       = {{2-3}},
  pages        = {{75--81}},
  title        = {{{Einblicke in die schulinterne Curriculumentwicklung – Der Schulversuch an der Maria-Montessori-Gesamtschule in Düsseldorf}}},
  volume       = {{46}},
  year         = {{2026}},
}

@inbook{67024,
  author       = {{Leinfellner, Stefanie}},
  booktitle    = {{Macht und Partizipation in gesellschaftlichen Transformationsprozessen}},
  editor       = {{Hansen, Christin and Schreckenberg, Carolin and Treder, Alexandra}},
  publisher    = {{wbg}},
  title        = {{{Partizipation, Geschlecht und ,Holding steady' in wissenschaftlichen Beschäftigungsverhältnissen}}},
  volume       = {{4}},
  year         = {{2026}},
}

@article{67161,
  abstract     = {{<jats:p>Optimization algorithms contain parameters that greatly influence their behavior. Finding the right settings for parameters through automated algorithm configuration has become a critical component of designing competitive algorithms. While traditional offline configurators tackle this problem by finding one configuration that works well for a set of instances, instance-specific algorithm configuration utilizes features of the instances to provide configurations that are tailored to each instance to maximize performance. We propose the first instance-specific algorithm configurator based on deep reinforcement learning that can be used in general algorithm configuration settings. Our method is able to handle large, mixed, discrete and continuous search spaces and only requires a small number of instances for training. Not only does it select an individual configuration for every instance, it also selects configurations from a much broader range. We show that our configurator provides improvements over the state-of-the-art instance-specific configurators ISAC++ and Hydra on a wide range of problem domains.</jats:p>}},
  author       = {{Schede, Elias and Seiler, Moritz Vinzent and Mensendiek, Carolin and Tierney, Kevin and Trautmann, Heike}},
  issn         = {{2688-299X}},
  journal      = {{ACM Transactions on Evolutionary Learning and Optimization}},
  publisher    = {{Association for Computing Machinery (ACM)}},
  title        = {{{OPTICAT: A Deep Reinforcement Learning Framework for Instance-Specific Algorithm Configuration}}},
  doi          = {{10.1145/3844954}},
  year         = {{2026}},
}