Research Data Repository of Saxon Universities
OPARA is the Open Access Repository and Archive for Research Data of Saxon Universities.
Researchers of Saxon Universities can either publish their research data on OPARA, or archive it here to comply with requirements of funding acencies and good scientic practice, without public access.
You can find the documentation of this service at the ZIH Data Compendium websites. If you need suppourt using OPARA please contact the Servicedesk of TU Dresden.
Please note: The OPARA service was recently upgraded to a new technical platform (this site). Previously stored data will not be available here immediately. It can be found at the still active old version of OPARA. These stock data will be migrated in near future and then the old version of OPARA will finally be shut down. Existing DOIs for data publications remain valid.
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Additional data: Impact of Chitosan's Degree of Deacetylation, Molecular Weight, and Crystallinity on the Photoresponsive Properties of Azobenzene-modified Films and Membranes.
(Technische Universität Bergakademie Freiberg, 2024-11-15) von Seggern, Nils; M. Thiebes, Yannick; Niewa, Rainer; Cord-Landwehr, Stefan; Moerschbacher, Bruno; Tovar, Günter E.M.
A profound understanding of how the degree of deacetylation (DDA), polymerization degree (DP) and photoswitch concentration impact the photomodulation of properties of chitosan(CS)-based responsive materials can serve as a framework for future applications. Herein, we report responsive thin-films manufactured from chitosans with DDA ranging from 70-94% and DP between 170-3380, incorporating 10 30mol% of the light-responsive azobenzene derivative Sodium-4-[(4-(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)phenyl)diazenyl]-benzenesulfonate (TEGABS). During UV-irradiation of the 10 30% TEGABS|CS thin-films, e.g. a significant increase of the indentation modulus by 10 ± 5% is observed. UV illumination leads to a decrease of the water vapor permeability (WVP), reducing it by up to 81 ± 17% compared to native state. We demonstrate that TEGABS up to 10% remains as a solid-solution in CS films with differing amount of H-aggregates depending on the DDA and DP. TEGABS in concentrations >10% in CS leads to phase separation of TEGABS crystallites with a diameter of 21 ± 8 nm. To conclude the photothermal heating by UV irradiation and the resulting water evaporation are identified as the primary driving force for the variation in mechanical properties and WVP, with photoisomerization playing a subordinate factor. These findings provide a new pathway for the design of polysaccharide-based water vapor permeable photoresponsive membranes.
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Open Access
Data for "Ferrimagnetism from triple-q order in Na2Co2TeO6"
(Technische Universität Dresden, 2024-11-14) Francini, Niccolò; Janssen, Lukas
The archive contains the data used to construct Fig. 3, Fig. 4, and Fig. 5(a) of the paper "Ferrimagnetism from triple-q order in Na2Co2TeO6" by N. Francini and L. Janssen [arXiv:2409.12234]. The work uses classical Monte-Carlo simulations to study the ferrimagnetic response of two different extended Kitaev-Heisenberg models realizing two different ground states: a collinear zigzag state and a noncollinear triple-q state.
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Open Access
Ultrafast switching of trions in 2D materials by terahertz photons
(Technische Universität Dresden, 2024-11-14) Venanzi, Tommaso; Cuccu, Marzia; Perea Causin, Raul; Sun, Xiaoxiao; Brem, Samuel; Erkensten, Daniel; Taniguchi, Takashi; Watanabe, Kenji; Malic, Ermin; Helm, Manfred; Winnerl, Stephan; Chernikov, Alexey
External control of optical excitations is key for manipulating light–matter coupling and is highly desirable for photonic technologies. Excitons in monolayer semiconductors emerged as a unique nanoscale platform in this context, offering strong light–matter coupling, spin–valley locking and exceptional tunability. Crucially, they allow electrical switching of their optical response due to efficient interactions of excitonic emitters with free charge carriers, forming new quasiparticles known as trions and Fermi polarons. However, there are major limitations to how fast the light emission of these states can be tuned, restricting the majority of applications to an essentially static regime. Here we demonstrate switching of excitonic light emitters in monolayer semiconductors on ultrafast picosecond time scales by applying short pulses in the terahertz spectral range following optical injection. The process is based on a rapid conversion of trions to excitons by absorption of terahertz photons inducing photodetachment. Monitoring time-resolved emission dynamics in optical-pump/terahertz-push experiments, we achieve the required resonance conditions as well as demonstrate tunability of the process with delay time and terahertz pulse power. Our results introduce a versatile experimental tool for fundamental research of light-emitting excitations of composite Bose–Fermi mixtures and open up pathways towards technological developments of new types of nanophotonic device based on atomically thin materials.
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Open Access
Rohdaten zur Dissertation "Intrinsische richtungsabhängige Geschwindigkeiten von Artikulatoren"
(Technische Universität Dresden, 2024-11-11) Kleiner, Christian
In zyklischen Lautsequenzen wurden Bewegungen der Zunge mit elektromagnetischer Artikulografie (EMA) an 18 Sprechern, Bewegungen des Gaumensegels und des Kehlkopfes mit Sonografie an fünf bzw. 20 Sprechern, und Bewegungen der Stimmlippen mit Endoskopie an 16 Sprechern aufgenommen.
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Open Access
Exciton diffusion in two-dimensional chiral perovskites
(Technische Universität Dresden, 2024-11-07) Terres, Sophia; Scalon, Lucas; Brunner, Julius; Horneber, Dominik; Düreth, Johannes; Huang, Shiyu; Taniguchi, Takashi; Watanabe, Kenji; Nogueira, Ana Flávia; Höfling, Sven; Klembt, Sebastian; Vaynzof, Yana; Chernikov, Alexey
This contains the data underpinning our recent paper on chiral 2D perovskites, uploaded on ArXiv (https://doi.org/10.48550/arXiv.2408.05946) in 2024. The abstract of the article is reproduced below:
Two-dimensional (2D) organic-inorganic hybrid perovskites emerged as a versatile platform for light-emitting and photovoltaic applications due to their unique structural design and chemical flexibility. Their properties depend heavily on both the choice of the inorganic lead halide framework and the surrounding organic layers. Recently, the introduction of chiral cations into 2D perovskites has attracted major interest due to their potential for introducing chirality and tuning the chiro-optical response. Importantly, the optical properties in these materials are dominated by tightly bound excitons that also serve as primary carriers for the energy transport. The mobility of photoinjected excitons is thus important from the perspectives of fundamental material properties and optoelectronic applications, yet remains an open question. Here, we demonstrate exciton propagation in a 2D chiral perovskite methylbenzylammonium lead iodide (MBA2PbI4) using transient photoluminescence microscopy and reveal density-dependent transport over more than 100 nanometers at room temperature with diffusion coefficients as high as 2 cm2/s. We observe two distinct regimes of initially rapid diffusive propagation and subsequent localization. Moreover, perovskites with enantiomer pure cations are found to exhibit faster exciton diffusion compared to the race-mic mixture, correlated with the impact of the material composition on disorder. Altogether, the observations of efficient exciton diffusion at room temperature highlight the potential of 2D chiral perovskites to merge chiro-optical properties with strong light-matter interaction and efficient energy transport.