@article{46278, abstract = {{Site-controlled Ga droplets on AlGaAs substrates are fabricated using area-selective deposition of Ga through apertures in a mask during molecular beam epitaxy (MBE). The Ga droplets can be crystallized into GaAs quantum dots using a crystallization step under As flux. In order to model the complex process, including the masked deposition of the droplets and a reduction of their number during a thermal annealing step, a multiscale kinetic Monte Carlo (mkMC) simulation of self-assembled Ga droplet formation on AlGaAs is expanded for area-selective deposition. The simulation has only two free model parameters: the activation energy for surface diffusion and the activation energy for thermal escape of adatoms from a droplet. Simulated droplet numbers within the opening of the aperture agree quantitatively with the experimental results down to the perfect site-control, with one droplet per aperture. However, the model parameters are different compared to those of the self-assembled droplet growth. We attribute this to the presence of the mask in close proximity to the surface, which modifies the local process temperature and the As background. This approach also explains the dependence of the model parameters on the size of the aperture.}}, author = {{Feddersen, Stefan and Zolatanosha, Viktoryia and Alshaikh, Ahmed and Reuter, Dirk and Heyn, Christian}}, issn = {{2079-4991}}, journal = {{Nanomaterials}}, keywords = {{General Materials Science, General Chemical Engineering}}, number = {{3}}, publisher = {{MDPI AG}}, title = {{{Modeling of Masked Droplet Deposition for Site-Controlled Ga Droplets}}}, doi = {{10.3390/nano13030466}}, volume = {{13}}, year = {{2023}}, } @article{46277, author = {{Sieland, Benedikt and Stahn, Marcel and Schoch, Roland and Daniliuc, Constantin and Spicher, Sebastian and Grimme, Stefan and Hansen, Andreas and Paradies, Jan}}, issn = {{1433-7851}}, journal = {{Angewandte Chemie International Edition}}, keywords = {{General Chemistry, Catalysis}}, publisher = {{Wiley}}, title = {{{Dispersion Energy‐Stabilized Boron and Phosphorus Lewis Pairs}}}, doi = {{10.1002/anie.202308752}}, year = {{2023}}, } @unpublished{40982, abstract = {{Effective photoinduced charge transfer makes molecular bimetallic assemblies attractive for applications as active light induced proton reduction systems. For a more sustainable future, development of competitive base metal dyads is mandatory. However, the electron transfer mechanisms from the photosensitizer to the proton reduction catalyst in base metal dyads remain so far unexplored. We study a Fe-Co dyad that exhibits photocatalytic H2 production activity using femtosecond X-ray emission spectroscopy, complemented by ultrafast optical spectroscopy and theoretical time-dependent DFT calculations, to understand the electronic and structural dynamics after photoexcitation and during the subsequent charge transfer process from the FeII photosensitizer to the cobaloxime catalyst. Using this novel approach, the simultaneous measurement of the transient Kalpha X-ray emission at the iron and cobalt K-edges in a two-colour experiment is enabled making it possible to correlate the excited state dynamics to the electron transfer processes. The methodology, therefore, provides a clear and direct spectroscopic evidence of the Fe->Co electron transfer responsible for the proton reduction activity.}}, author = {{Nowakowski, Michał and Huber-Gedert, Marina and Elgabarty, Hossam and Kubicki, Jacek and Kertem, Ahmet and Lindner, Natalia and Khakhulin, Dimitry and Lima, Frederico Alves and Choi, Tae-Kyu and Biednov, Mykola and Piergies, Natalia and Zalden, Peter and Kubicek, Katerina and Rodriguez-Fernandez, Angel and Salem, Mohammad Alaraby and Kühne, Thomas and Gawelda, Wojciech and Bauer, Matthias}}, booktitle = {{arxiv}}, title = {{{Ultrafast two-colour X-ray emission spectroscopy reveals excited state landscape in a base metal dyad}}}, year = {{2023}}, } @inproceedings{46485, abstract = {{We present a miniaturized pulse shaping device that creates an arbitrary dispersion through the interaction of multiple metasurfaces on less than 2 mm3 volume. For this, a metalens and a grating-metasurface between two silver mirrors are fabricated. The grating contains further phase information to achieve the device's pulse shaping functionality.}}, author = {{Geromel, René and Georgi, Philip and Protte, Maximilian and Bartley, Tim and Huang, Lingling and Zentgraf, Thomas}}, booktitle = {{CLEO: Fundamental Science 2023}}, location = {{San Jose, USA}}, publisher = {{Optica Publishing Group}}, title = {{{Dispersion control with integrated plasmonic metasurfaces}}}, doi = {{10.1364/cleo_fs.2023.fth4d.3}}, year = {{2023}}, } @article{44851, abstract = {{We present the fabrication of strain-free quantum dots in the In0.53Ga0.47As/In0.52Al0.48As-system lattice matched to InP, as future sources for single and entangled photons for long-haul fiber-based quantum communication in the optical C-band. We achieved these quantum dots by local droplet etching via InAl droplets in an In0.52Al0.48As layer and subsequent filling of the holes with In0.53Ga0.47As. Here, we present detailed investigations of the hole morphologies measured by atomic force microscopy. Statistical analysis of a set of nanoholes reveals a high degree of symmetry for nearly half of them when etched at optimized temperatures. Overgrowth with 50–150 nm In0.52Al0.48As increases their diameter and elongates the holes along the [01̄1]-direction. By systematically scanning the parameter space, we were able to fill the holes with In0.53Ga0.47As, and by capping the filled holes and performing photoluminescence measurements, we observe photoluminescence emission in the O-band up into the C-band depending on the filling height of the nanoholes.}}, author = {{Deutsch, D. and Buchholz, C. and Zolatanosha, V. and Jöns, K. D. and Reuter, D.}}, issn = {{2158-3226}}, journal = {{AIP Advances}}, keywords = {{General Physics and Astronomy}}, number = {{5}}, publisher = {{AIP Publishing}}, title = {{{Telecom C-band photon emission from (In,Ga)As quantum dots generated by filling nanoholes in In0.52Al0.48As layers}}}, doi = {{10.1063/5.0147281}}, volume = {{13}}, year = {{2023}}, } @article{46480, author = {{Müller, Hendrik and Weinberger, Christian and Grundmeier, Guido and de los Arcos de Pedro, Maria Teresa}}, issn = {{0368-2048}}, journal = {{Journal of Electron Spectroscopy and Related Phenomena}}, keywords = {{Physical and Theoretical Chemistry, Spectroscopy, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Radiation, Electronic, Optical and Magnetic Materials}}, publisher = {{Elsevier BV}}, title = {{{UV-enhanced environmental charge compensation in near ambient pressure XPS}}}, doi = {{10.1016/j.elspec.2023.147317}}, volume = {{264}}, year = {{2023}}, } @inproceedings{45371, author = {{Elsner, Julia and Tenberge, Claudia and Fechner, Sabine}}, booktitle = {{Lernen, Lehren und Forschen in einer digital geprägten Welt}}, editor = {{van Vorst, Helena}}, pages = {{925--928}}, title = {{{Videoanalyse des Modellierprozesses von Grundschüler*innen}}}, volume = {{43}}, year = {{2023}}, } @article{46542, abstract = {{Multiprotein adsorption from complex body fluids represents a highly important and complicated phenomenon in medicine. In this work, multiprotein adsorption from diluted human serum at gold and oxidized iron surfaces is investigated at different serum concentrations and pH values. Adsorption-induced changes in surface topography and the total amount of adsorbed proteins are quantified by atomic force microscopy (AFM) and polarization-modulation infrared reflection absorption spectroscopy (PM-IRRAS), respectively. For both surfaces, stronger protein adsorption is observed at pH 6 compared to pH 7 and pH 8. PM-IRRAS furthermore provides some qualitative insights into the pH-dependent alterations in the composition of the adsorbed multiprotein films. Changes in the amide II/amide I band area ratio and in particular side-chain IR absorption suggest that the increased adsorption at pH 6 is accompanied by a change in protein film composition. Presumably, this is mostly driven by the adsorption of human serum albumin, which at pH 6 adsorbs more readily and thereby replaces other proteins with lower surface affinities in the resulting multiprotein film.}}, author = {{Huang, Jingyuan and Qiu, Yunshu and Lücke, Felix and Su, Jiangling and Grundmeier, Guido and Keller, Adrian}}, issn = {{1420-3049}}, journal = {{Molecules}}, keywords = {{Chemistry (miscellaneous), Analytical Chemistry, Organic Chemistry, Physical and Theoretical Chemistry, Molecular Medicine, Drug Discovery, Pharmaceutical Science}}, number = {{16}}, publisher = {{MDPI AG}}, title = {{{Multiprotein Adsorption from Human Serum at Gold and Oxidized Iron Surfaces Studied by Atomic Force Microscopy and Polarization-Modulation Infrared Reflection Absorption Spectroscopy}}}, doi = {{10.3390/molecules28166060}}, volume = {{28}}, year = {{2023}}, } @article{46543, abstract = {{The influence of nanoscale surface topography on protein adsorption is highly important for numerous applications in medicine and technology. Herein, ferritin adsorption at flat and nanofaceted, single-crystalline Al2O3 surfaces is investigated using atomic force microscopy and X-ray photoelectron spectroscopy. The nanofaceted surfaces are generated by the thermal annealing of Al2O3 wafers at temperatures above 1000 °C, which leads to the formation of faceted saw-tooth-like surface topographies with periodicities of about 160 nm and amplitudes of about 15 nm. Ferritin adsorption at these nanofaceted surfaces is notably suppressed compared to the flat surface at a concentration of 10 mg/mL, which is attributed to lower adsorption affinities of the newly formed facets. Consequently, adsorption is restricted mostly to the pattern grooves, where the proteins can maximize their contact area with the surface. However, this effect depends on the protein concentration, with an inverse trend being observed at 30 mg/mL. Furthermore, different ferritin adsorption behavior is observed at topographically similar nanofacet patterns fabricated at different annealing temperatures and attributed to different step and kink densities. These results demonstrate that while protein adsorption at solid surfaces can be notably affected by nanofacet patterns, fine-tuning protein adsorption in this way requires the precise control of facet properties.}}, author = {{Pothineni, Bhanu K. and Kollmann, Sabrina and Li, Xinyang and Grundmeier, Guido and Erb, Denise J. and Keller, Adrian}}, issn = {{1422-0067}}, journal = {{International Journal of Molecular Sciences}}, keywords = {{Inorganic Chemistry, Organic Chemistry, Physical and Theoretical Chemistry, Computer Science Applications, Spectroscopy, Molecular Biology, General Medicine, Catalysis}}, number = {{16}}, publisher = {{MDPI AG}}, title = {{{Adsorption of Ferritin at Nanofaceted Al2O3 Surfaces}}}, doi = {{10.3390/ijms241612808}}, volume = {{24}}, year = {{2023}}, } @article{46741, author = {{Zscherp, Mario Fabian and Jentsch, Silas Aurel and Müller, Marius Johannes and Lider, Vitalii and Becker, Celina and Chen, Limei and Littmann, Mario and Meier, Falco and Beyer, Andreas and Hofmann, Detlev Michael and As, Donat Josef and Klar, Peter Jens and Volz, Kerstin and Chatterjee, Sangam and Schörmann, Jörg}}, issn = {{1944-8244}}, journal = {{ACS Applied Materials & Interfaces}}, keywords = {{General Materials Science}}, number = {{33}}, pages = {{39513--39522}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Overcoming the Miscibility Gap of GaN/InN in MBE Growth of Cubic InxGa1–xN}}}, doi = {{10.1021/acsami.3c06319}}, volume = {{15}}, year = {{2023}}, } @article{37466, abstract = {{Typically, head fakes in basketball are generated to, and actually do, deteriorate performance on the side of the observer. However, potential costs at the side of the producer of a fake action have only rarely been investigated before. It is thus not clear yet if the benefit (i.e., slowed reactions in the observer) of performing a head fake is overestimated due to concurrently arising fake production costs (i.e., slowed performance in the producer of a head fake). Therefore, we studied potential head-fake production costs with two experiments. Novice participants were asked to generate passes to the left or right side, either with or without head fakes. In Experiment 1, these actions were determined by an auditory stimulus (i.e., a 440 Hz or 1200 Hz sinus or jigsaw wave). After an interstimulus interval (ISI) of either 0 ms, 800 ms, or 1500 ms, which served the preparation of the action, the cued action had to be executed. In Experiment 2, passing to the left or right, either with or without a head fake, was determined by a visual stimulus (i.e., a player with a red or blue jersey defending either the right or left side). After an ISI of either 0 ms, 400 ms, 800 ms, or 1200 ms, the cued action had to be executed. In both experiments, we observed higher reaction times (RTs) for passes with head fakes as compared to passes without head fakes for no and an intermediate preparation interval (from ISI 0 ms to 800 ms), but no difference for a long preparation interval (for an ISI of 1200 ms and 1500 ms). Both experiments show that generating fake actions produces performance costs, however, these costs can be overcome by a longer preparation phase before movement execution.}}, author = {{Güldenpenning, Iris and Weigelt, Matthias and Böer, Nils Tobias and Kunde, Wilfried}}, issn = {{0167-9457}}, journal = {{Human Movement Science}}, keywords = {{Experimental and Cognitive Psychology, Orthopedics and Sports Medicine, General Medicine, Biophysics}}, publisher = {{Elsevier BV}}, title = {{{Producing deceptive actions in sports: The costs of generating head fakes in basketball}}}, doi = {{10.1016/j.humov.2022.103045}}, volume = {{87}}, year = {{2023}}, } @article{46868, abstract = {{AbstractSupplementing an earlier analysis of event‐related potentials in extensive motor learning (Margraf et al., 2022a, 2022b), frontal theta‐band activity (4–8 Hz) was scrutinized. Thirty‐seven participants learned a sequential arm movement with 192 trials in each of five practice sessions. Feedback, based on a performance adaptive bandwidth, was given after every trial. Electroencephalogram (EEG) was recorded in the first and last practice sessions. The degree of motor automatization was tested under dual‐task conditions in a pre‐test–post‐test design. Quantitative error information was transported in both feedback conditions (positive and negative). Frontal theta activity was discussed as a general signal that cognitive control is needed and, therefore, was expected to be higher after negative feedback. Extensive motor practice promotes automatization, and therefore, decreased frontal theta activity was expected in the later practice. Further, it was expected that frontal theta was predictive for subsequent behavioural adaptations and the amount of motor automatization. As the results show, induced frontal theta power was higher after negative feedback and decreased after five sessions of practice. Moreover, induced theta activity was predictive for error correction and, therefore, an indicator of whether the recruited cognitive resources successfully induced behavioural adaptations. It remains to be solved why these effects, which fit well with the theoretical assumptions, were only revealed by the induced part of frontal theta activity. Further, the amount of theta activity during practice was not predictive for the degree of motor automatization. It seems that there might be a dissociation between attentional resources associated with feedback processing and attentional resources associated with motor control.}}, author = {{Margraf, Linda and Krause, Daniel and Weigelt, Matthias}}, issn = {{0953-816X}}, journal = {{European Journal of Neuroscience}}, keywords = {{General Neuroscience}}, number = {{8}}, pages = {{1297--1316}}, publisher = {{Wiley}}, title = {{{Frontal theta reveals further information about neural valence‐dependent processing of augmented feedback in extensive motor practice - A secondary analysis}}}, doi = {{10.1111/ejn.15951}}, volume = {{57}}, year = {{2023}}, } @article{43061, abstract = {{Purpose: The aim of this study was to examine whether cortical activity changes during exercise with increasing cognitive demands in preadolescent children. Method: Twenty healthy children (8.75 [0.91] y) performed one movement game, which was conducted with lower and higher cognitive demands. During a baseline measurement and both exercise conditions, cortical activity was recorded using a 64-channel electroencephalographic system, and heart rate was assessed. Ratings of perceived excertion and perceived cognitive engagement were examined after each condition. To analyze power spectral density in the theta, alpha-1, and alpha-2 frequency bands, an adaptive mixture independent component analysis was used to determine the spatiotemporal sources of cortical activity, and brain components were clustered to identify spatial clusters. Results: One-way repeated-measures analyses of variance revealed significant main effects for condition on theta in the prefrontal cluster, on alpha-1 in the prefrontal, central, bilateral motor, bilateral parieto-occipital, and occipital clusters, and on alpha-2 in the left motor, central, and left parieto-occipital clusters. Compared with the lower cognitive demand exercise, cortical activity was significantly higher in theta power in the prefrontal cluster and in alpha-1 power in the occipital cluster during the higher cognitive demand exercise. Conclusion: The present study shows that exercise complexity seems to influence cortical processing as it increased with increasing cognitive demands.}}, author = {{Becker, Linda and Büchel, Daniel and Lehmann, Tim and Kehne, Miriam and Baumeister, Jochen}}, issn = {{0899-8493}}, journal = {{Pediatric Exercise Science}}, keywords = {{Physical Therapy, Sports Therapy and Rehabilitation, Orthopedics and Sports Medicine, Pediatrics, Perinatology and Child Health}}, pages = {{1--11}}, publisher = {{Human Kinetics}}, title = {{{Mobile Electroencephalography Reveals Differences in Cortical Processing During Exercises With Lower and Higher Cognitive Demands in Preadolescent Children}}}, doi = {{10.1123/pes.2021-0212}}, year = {{2023}}, } @article{42717, author = {{Strotmeyer, Anne and Ortwein, Lena and Kehne, Miriam}}, journal = {{Playground@Landscape}}, number = {{1}}, pages = {{92--97}}, title = {{{Spielplatzgeräte: Potenziale zur ganzheitlichen Förderung von Heranwachsenden}}}, year = {{2023}}, } @article{47130, author = {{Güldenpenning, Iris and Jackson, Robin C. and Cañal-Bruland, Rouwen}}, journal = {{Human Movement Science}}, publisher = {{Elsevier}}, title = {{{The science of deceptive human movement}}}, doi = {{https://doi.org/10.1016/j.humov.2023.103147}}, volume = {{92}}, year = {{2023}}, } @inbook{47059, author = {{Weigelt, Matthias and Krause, Daniel and Güldenpenning, Iris}}, booktitle = {{Sport and Exercise Psychology}}, editor = {{Schüler, J. and Wegner, M. and Plessner, H. and Eklund, R. C. }}, isbn = {{9783031039201}}, pages = {{41--70}}, publisher = {{Springer}}, title = {{{Learning and Memory in Sports}}}, doi = {{10.1007/978-3-031-03921-8_3}}, year = {{2023}}, } @article{47140, abstract = {{The structural stability of DNA origami nanostructures in various chemical environments is an important factor in numerous applications, ranging from biomedicine and biophysics to analytical chemistry and materials synthesis. In...}}, author = {{Hanke, Marcel and Dornbusch, Daniel and Tomm, Emilia and Grundmeier, Guido and Fahmy, Karim and Keller, Adrian}}, issn = {{2040-3364}}, journal = {{Nanoscale}}, keywords = {{General Materials Science}}, publisher = {{Royal Society of Chemistry (RSC)}}, title = {{{Superstructure-dependent stability of DNA origami nanostructures in the presence of chaotropic denaturants}}}, doi = {{10.1039/d3nr02045b}}, year = {{2023}}, } @inproceedings{44694, author = {{Böer, Nils Tobias and Weigelt, Matthias and Kunde, Wilfried and Güldenpenning, Iris}}, booktitle = {{Human Performance – Assessment, Intervention & Analysen. Abstractband der 55. Jahrestagung der Arbeitsgemeinschaft für Sportpsychologie (asp)}}, editor = {{Schott, Nadja and Klotzbier, Thomas and Korbus, Heide and El-Rajab, I. and Holfelder, B. and Park, S-Y.}}, keywords = {{Perception, Action Preparation, Cognition}}, location = {{Stuttgart: Universität Stuttgart}}, pages = {{116--117}}, publisher = {{Universität Stuttgart}}, title = {{{The influence of effort instructions on the production of head fakes in basketball}}}, year = {{2023}}, } @inproceedings{45779, author = {{Böer, Nils Tobias and Weigelt, Matthias and Güldenpenning, Iris}}, booktitle = {{Abstracts of the 65th Conference of Experimental Psychologists (TeaP)}}, editor = {{Merz, Simon and Frings, Christian and Leuchtenberg, Bettina and Moeller, Birte and Mueller, Stefanie and Neumann, Roland and Pastötter, Bernhard and Pingen, Leah and Schui, Gabriel}}, keywords = {{perception, action preparation, movement planning, effort instructions}}, location = {{Trier}}, pages = {{66--67}}, title = {{{The influence of effort instructions on producing head fakes in basketball }}}, doi = {{https://doi.org/10.23668/psycharchives.12945}}, year = {{2023}}, } @unpublished{47532, abstract = {{In planar microcavities, the transverse-electric and transverse-magnetic (TE-TM) mode splitting of cavity photons arises due to their different penetration into the Bragg mirrors and can result in optical spin-orbit coupling (SOC). In this work, we find that in a liquid crystal (LC) microcavity filled with perovskite microplates, the pronounced TE-TM splitting gives rise to a strong SOC that leads to the spatial instability of microcavity polariton condensates under single-shot excitation. Spatially varying hole burning and mode competition occurs between polarization components leading to different condensate profiles from shot to shot. The single-shot polariton condensates become stable when the SOC vanishes as the TE and TM modes are spectrally well separated from each other, which can be achieved by application of an electric field to our LC microcavity with electrically tunable anisotropy. Our findings are well reproduced and traced back to their physical origin by our detailed numerical simulations. With the electrical manipulation our work reveals how the shot-to-shot spatial instability of spatial polariton profiles can be engineered in anisotropic microcavities at room temperature, which will benefit the development of stable polariton-based optoeletronic and light-emitting devices.}}, author = {{Gao, Ying and Ma, Xuekai and Zhai, Xiaokun and Xing, Chunzi and Gao, Meini and Dai, Haitao and Wu, Hao and Liu, Tong and Ren, Yuan and Wang, Xiao and Pan, Anlian and Hu, Wei and Schumacher, Stefan and Gao, Tingge}}, booktitle = {{arXiv:2305.01368}}, title = {{{Single-shot spatial instability and electric control of polariton condensates at room temperature}}}, year = {{2023}}, }