Technische Universität Dresden

Permanent URI for this community

http://opara.zih.tu-dresden.de/handle/123456789/10
Research data repository of Dresden University of Technology.

Browse

Browsing Technische Universität Dresden by Subject "3"

Now showing 1 - 8 of 8
  • Item
    Open Access
    Data STM NBD
    (Technische Universität Dresden, 2024-07-15) Moresco, Francesca
    Supplementary raw STM data to the publication "Direct imaging of a norbornadiene (NBD) derivative adsorbed on the Au(111) surface"
  • Item
    Open Access
    Data STM rotor and car
    (Technische Universität Dresden, 2024-09-11) Moresco, Francesca
    Supplementary raw STM data to the publication "A Nanocar and Rotor in One Molecule" https://doi.org/10.48550/arXiv.2305.06791
  • Item
    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.
  • Item
    Open Access
    PGT Prompt Gamma Timing PETsys data for publication at IKTP (PGT)
    (Technische Universität Dresden, 2024-05-14) Novgorodova, Olga; Straessner, Arno; Hentges, Rainer; Glatte, Andreas; Lutz, Benjamin; Roemer, Katja; Teichmann, Thobias; Koegler, Toni
    Proton therapy requires range verification in order to exploit its full potential. One of the most promising approaches is to monitor prompt gamma-rays produced by nuclear interactions of the therapeutic particles in the patient tissues. In our paper, we test PETsys electronics with a detector with a wide energy range from 100 keV to 15 MeV. We tested what time resolution we could achieve as a high time resolution is required to achieve millimetric precision in the proton range. PETsys should survive high count rates and the fraction of pile-up events should be low or separatable. We are investigating a full acceptance approach with increased granularity in order to reduce the size of the scintillators and consequently the count rate per channel. Ideally, we want to stack the scintillators in matrices that require suitable multi-channel photo-multipliers and a fitting acquisition system. Here, we present two geometries of CeBr3 crystals 5 × 5 × 20 mm3 and 10 × 10 × 30 mm3, together with modern silicon photo-multipliers (SiPM) adapted to work with the PETsys TOFPET2 ASIC. The TOFPET2 ASIC was developed for Time-of-Flight Positron Emission Tomography (TOF-PET) applications. Here are our data measured for the publication for time resolution and coincidence time resolution, energy resolution with AmBe source, and dead time studies.
  • Item
    Unknown
    RillGrowEvaluationTime-LapseSfM
    (Technische Universität Dresden, 2024-08-29) Eltner, Anette
    This project contains data for the evaluation and calibration of model outputs of several thousand runs of the soil erosion model RillGrow. For more information about the data see the read.me.
  • Item
    Open Access
    Supplementary STM data on the unidirectional rotation of DMNI-P molecules on Au(111)
    (Technische Universität Dresden, 2024-09-24) Moresco, Francesca
    Supplementary raw data to the publication “Thermal with Electronic Excitation for the Unidirectional Rotation of a Molecule on a Surface” https://arxiv.org/abs/2409.05485v1 https://doi.org/10.48550/arXiv.2409.05485
  • Item
    Open Access
    Supplementary STM data on Thianthrene-based Molecules on AU(111)
    (Technische Universität Dresden, 2024-09-24) Moresco, Francesca
    Supplementary raw STM data to the publication "Tuning the Planarity of an Aromatic Thianthrene-Based Molecule on Au(111)" https://arxiv.org/abs/2409.05489v1
  • Item
    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.