Interlayer excitons (IXs) in van der Waals heterostructures exhibit unique optical properties due to their spatially separated charge carriers. However, the weak oscillator strength and radiative broadening of IXs make them difficult to detect with conventional absorption spectroscopy. Here, we use scattering-type scanning near-field optical microscopy (s-SNOM) to directly probe the dielectric response at the nanoscale. We first validate this approach by measuring the B-exciton in a four-layer MoS2 sample, where ion irradiation introduced defect-induced broadening. Extending this method to a MoSe2/WSe2 heterostructure, we observe a Lorentzian resonance at 1.35 eV, characteristic of interlayer excitons, with broadening dominated by nonradiative decay. These results demonstrate the capability of s-SNOM to image and characterize weak excitonic resonances at the nanoscale, overcoming the limitations of conventional techniques and providing new insights into localized exciton dynamics in 2D heterostructures.

This paper presents ‘Practice Profiles’ as a scalable method for understanding journalists as relational actors in public discourses who negotiate roles with other groups of actors. Informed by a framework of performative publics and practice theory, our innovative research design combines social network analyses (SNA) with standardised analyses of actors and practices (SAPA) and applies them to two contrastive case studies – #systemrelevant and #coronaeltern – during the Corona pandemic in Germany. Social network analyses of discourses on Twitter (now: X) between 2020-2021 show the emergence of different issue networks through personal and professional practices of engagement among six actor groups (journalism, civil society, science/education, politics, non-institutionalised media, and private individuals). We find marked similarities in modes of engagement among rather professional uses of Twitter in distinction from private individuals. The study puts forward a relational understanding of journalism through a scalable method, implementing a medium-data approach. The method is positioned as a contribution to digital journalism studies to reveal discourse-specific absence or presence of journalistic actors in the formation of public discourses through a focus on practices of journalists and their audiences alike.

We investigated the properties of the [Fe{H2B(pz)(pypz)}2] spin-crossover complex deposited on highly oriented pyrolytic graphite (HOPG) by x-ray absorption spectroscopy (XAS) in the temperature range from 10 to 350 K for sample thicknesses from 0.9(1) to 1.3(2) ML. The highest temperature at which light can excite the system to a long-lived metastable high-spin state (TLIESST) and the temperature at which a thermal spin transition occurs (T_1/2) for the thin film samples are found as about 45 and 325 K, respectively, in agreement with the bulk values. The bulk phase has previously been studied by magnetic susceptibility measurements where it was found that two different polymorphic modifications exist. These findings suggest a potential correlation between TLIESST and the high T_1/2 from the different film thicknesses of the tridentate [Fe{H2B(pz)(pypz)}2] spin-crossover molecule, with thinner samples exhibiting lower T_1/2 values. Finally, the highest high-spin fraction achieved for [Fe{H2B(pz)(pypz)}2] is 0.77 for samples of 0.9(1) and 1.1(1) ML on HOPG at 10 K and constant light irradiation.

Synopse zu Goethes „Märchen“ von 1795 Diese vergleichende sprachwissenschaftliche Interpretationsgeschichte des Märchens führt eine Tabelle fort, die aus einer Unterhaltung zwischen Charlotte von Kalb, Friedrich Schiller und Goethe entstanden ist, über die Frage der Bedeutung der einzelnen Figuren in Goethes „Märchen“ von 1795. (vgl. dazu: Friedrich, Theodor: „Goethes Märchen. Mit einer Einführung und einer Stoffsammlung zur Geschichte und Nachgeschichte des Märchens“, Leipzig 1925) Die Synopse und Bibliographie wurde im Rahmen einer literaturwissenschaftlichen Publikation als studentischer Mitarbeiter von mir erstellt (1996-1997) und wurde zuerst online publiziert durch die Herausgeber 2009. Die angehängte Bibliographie entspricht „III. Sekundärliteratur zum Märchen“ der Gesamtveröffentlichung: (Hans Laufenberg, Jochen Klaus (Hrsg.): Mythos. Goethes Märchen ausgelegt. Freundeskreis des Goethe Nationalmuseums e.V., Weimar 2009, ISBN 978-3-00-027766-5.) Bei den Märcheninterpretationen hat sich von Beginn an die Tendenz durchgesetzt, eine „Idee des Märchens“ zu formulieren. Deswegen wurde von mir diese Tabellenspalte hinzugefügt. Berlin, den 4. Juli 2025 André Renis

Digitaler Plan des Forschungsgebiets des Harzhorn-Projektes am Harzhorn und Kahlberg als gelayertes PDF. Der Plan beinhaltet die Ergebnisse des Harzhorn-Projektes, das als gedruckte Publikation vorliegt: M. Geschwinde / M. Meyer / P. Lönne / T. Schatte, Harzhorn. Die Archäologie eines germanisch-römischen Kampfplatzes des 3. Jahrhunderts n. Chr. Römisch-Germanische Forschungen 77 (Wiesbaden 2024). Als Kartengrundlagen des bereitgestellten Plans werden ein LIDAR-Scan und eine topographische Karte des Gebietes angeboten. Zudem sind Karten zu den Erhaltungswahrscheinlichkeiten, den Fundarealen und den Grabungsflächen enthalten. Alle Fundstücke sind kartiert und nach Fundgruppen gegliedert. Die Beschriftung bezieht sich auf die Katalognr. in der benannten Publikation.

Die Datei beinhaltet die tabellarische Datenbank der Schuhnagelfunde des Harzhorn-Projektes aus den Jahren 2008 bis 2018 und umfasst alle dazu erhobenen Daten. Die angebenen Kat.Nr. korrelieren mit der Publikation: M. Geschwinde / M. Meyer / P. Lönne / T. Schatte, Harzhorn. Die Archäologie eines germanisch-römischen Kampfplatzes des 3. Jahrhunderts n. Chr. Römisch-Germanische Forschungen 77 (Wiesbaden 2024). Die ebenfalls aufgeführten Fund-Nr. beziehen sich auf die während der Feldarbeiten vergebenen Nummern. Das kaiserzeitliche Fundmaterial wurde in einer gesonderten Tabelle vorgelegt und ist hier nicht enthalten.

Die Datei beinhaltet die tabellarische Datenbank der kaiserzeitlichen Harzhorn-Funde aus den Jahren 2008 bis 2018 und umfasst alle dazu erhobenen Daten. Die angebenen Kat.Nr. korrelieren mit der Publikation: M. Geschwinde / M. Meyer / P. Lönne / T. Schatte, Harzhorn. Die Archäologie eines germanisch-römischen Kampfplatzes des 3. Jahrhunderts n. Chr. Römisch-Germanische Forschungen 77 (Wiesbaden 2024). Die ebenfalls aufgeführten Fund-Nr. beziehen sich auf die während der Feldarbeiten vergebenen Nummern. Die Schuhnagelfunde werden in einer gesonderten Tabelle vorgelegt und sind hier nicht enthalten.

Die Dateien umfassen mehrere Geopackages für die Anwendung in QGIS.

Sie basieren auf den Forschungen des Harzhorn-Projektes, welches als Buch publiziert vorliegt: M. Geschwinde / M. Meyer / P. Lönne / T. Schatte, Harzhorn. Die Archäologie eines germanisch-römischen Kampfplatzes des 3. Jahrhunderts n. Chr. Römisch-Germanische Forschungen 77 (Wiesbaden 2024).

Neben verschiedenen Kartengrundlagen wie digitalem Geländemodell und historischen Karten, sind Karten zur Prospektionsintensität und die Ergebnisse zu Erhaltungswahrscheinlichkeiten und Geländerekonstruktion enthalten. Ebenfalls enthalten ist die gesamte Fundverteilung, die mit der Funddatenbank verlinkt ist. Für die in der Synthese in Band 2 des Harzhorn-Buches vorgestellten rekonstruierten Handlungsabläufe wurden Fundgruppen erstellt und interpretiert. Diese werden in einem eigenen Geopackage bereitgestellt.

Die jeweiligen Geopackages können direkt über drag-and-drop in ein QGIS Projekt geladen werden. Auch die Auswahl einzelner Layer ist hier möglich. Die Layer eines Geopackages lassen sich auch in einem nach dem Geopackage benannten Ordner laden.

Diese Daten werden zur Verfügung gestellt, um eine Grundlage für unabhängige Modellierungen mit den Funddaten anzubieten.

Die Tabelle umfasst den Katalog zu allen bearbeiteten Schildfibeln und Fibeln mit Zierplatten der jüngeren Römischen Kaiserzeit, die im betreffenden Artikel in der Praehistorischen Zeitschrift besprochen werden (Schildfibeln und Fibeln mit Zierplatten der jüngeren Römischen Kaiserzeit, Teil 1 und 2; Praehistorische Zeitschrift 2024; https://doi.org/10.1515/pz-2024-2015; ). Die Online-Version ist umfangreicher als der Katalog in der gedruckten Publikation. Sie enthält zusätzlich Informationen u.a. zur Datierung, Material, Fundkontext, Geschlechtsbestimmung und einer Beschreibung signifikanter Charakteristika.

We extend our theoretical description of optical excitations in binary plasmonic supercrystals made of two types of metal nanoparticles to three common cubic structures: sodium chloride (NaCl), zincblende (ZnS), and auricupride (Cu$_3$Au). Our microscopic model of plasmon polaritons in supercrystals incorporates dipole and quadrupole nanoparticle excitations, their interactions, and their coupling with photons. We calculate the plasmonic energy band dispersion in the first Brillouin zone of the supercrystal and demonstrate its dependence on the material properties of the nanoparticles and the symmetry properties of the structures. To gain further insight into the coupling of different excitations and develop a set of symmetry selection rules for each structure, we complement our calculations with an extensive group theory analysis. Comparing the results across various structures makes our symmetry analysis more general, enabling us to observe selection rules that apply to multiple structures.

Germany has three species of high responsibility for conservation that belong to the closely related genera Spergula and Spergularia. A comprehensive sampling including all three species of responsibility from herbarium material and grown from seeds was used to do Sanger sequencing. Four different markers (ITS, trnKmatK, rpl16, trnL-trnF) were sequenced, phylogenetic and network approaches were used to identify closely lineages of the species of interest, infer monophyly of the species and establish first insights into the diversity of the species. Spergula morisonii is widely distributed in Germany and closely related to S. pentandra. The five samples have several haplo- and ribotypes, without a clear geographic pattern. Spergularia segetalis is one of the first branches of Spergularia and shows a clear isolation-by-distance pattern of diversity. Spergularia echinsoperma belongs to a group of European widespread species, but the included samples all share the same haplo- and ribotype. A population genetic study is needed to get a clear picture of the diversity of S. morisonii and Sp. echinosperma in Germany.

We report the synthesis of a fluorescent polycyclic aromatic hydrocarbon dye with a "symmetry-broken" core, derived from the related hexa-peri-benzocoronene core with a fluoranthene subunit. The fluorophore is composed of a pure carbon skeleton without heteroatoms and exhibits remarkable photoluminescence properties with a photoluminescence quantum yield of up to 67% in toluene, exceeding that of the parent hexa-peri-benzocoronene by a factor of 30. The single crystal X-ray structure reveals the distorted polycyclic aromatic hydrocarbon structure, which is responsible for the optoelectronic properties, as supported by density functional theory calculations. We show that the new fluorescent dye can be readily used for the fabrication of organic light-emitting diodes without extensive optimization, whereby solubility in a variety of solvents and successful film formation are decisive.

This study explores the stratospheric pathway of the Arctic mid-latitude linkage (AML), a mechanism that connects Arctic amplification (AA) to cold winter weather in mid-latitudes. Using the chemistry-climate model EMAC, we investigate the transition of the AML signal between the troposphere and the stratosphere, focusing on changes in wave activity. Three timeslice experiments were analyzed, covering pre-industrial (1850), present (2020), and future (2100) climates. Compared to a pre-industrial state, both climate change simulations reveal increasing wave propagation and wave breaking in the stratosphere, accompanied by a higher occurrence of sudden stratospheric warmings (SSWs). This intensified wave activity enters the stratosphere particularly from the North Pacific and the Atlantic/European region. An evaluation of subseasonal wave activity episodes reveals more frequent tropopause-level wave input events during winter. While we found a significant rise in SSW events in our climate change simulations, their downward influence on mid-latitude winter weather appears to diminish, likely due to a warmer Arctic and the reduced severity of cold air outbreaks. Furthermore, we relate the changes in planetary wave generation to tropospheric baroclinicity, which is controlled by horizontal temperature gradients and static stability. Notably, AA suppresses baroclinic wave formation by weakening horizontal temperature gradients in the lower troposphere. In contrast, the enhanced wave generation in the mid-latitude upper troposphere could be attributed to temperature modifications at nearby altitudes, driven by tropical warming and lower-stratospheric cooling. Finally, considered in isolation, the polar jet was not found to weaken or become more wavy, as proposed by the AML hypothesis.

We present sedimentological data from 3 sediment cores (RI 05, RI 12 and RI 13), which were obtained from a backfilled Weser paleo-meander near the town of Rinteln in Lower Saxony, Germany.

The sediment cores were extracted during two field campaigns in April and August of 2023 using a petrol-driven Wacker hammer (BHF 30 S) with closed steel tubes equipped with PVC liners (5 cm diameter). In the Laboratory for Physical Geography of the Freie Universität Berlin the PVC liners were opened and extracted sediments were cleaned and documented.

The presented sedimentological parameters include: raw data of elemental composition derived by a portable energy-dispersive X-ray fluorescence spectrometer (Thermo Scientific Niton XL3t, see Hoelzmann et al. 2017; https://doi.org/10.5194/gi-6-93-2017) and volume-specific magnetic susceptibility (frequency 0.46 kHz, with an MS2C core scanning sensor and an MS3 meter; Bartington Instruments), both measured on the split sediment cores. Raw measurements of grain size distributions were done using a Beckmann Coulter LS13320 with PIDS (six measurements per sample). Carbonates were dissolved using 17 % HCl and organic material was removed by applying 30 % H2O2 for several days in a 40 °C water bath. Prior to measuring, 0.5 g Na4P2O7 was added as an anti-coagulation agent, the samples were placed in an overhead shaker for 24 h and exposed to ultrasonic. Loss on Ignition was investigated following the procedure described by Dean (1974; https://doi.org/10.1306/74D729D2-2B21-11D7-8648000102C1865D) and calculated after Heiri et al. (2001; https://doi.org/10.1023/A:1008119611481). pH values and electric conductivity were determined on subsamples of 5 g in a solution of 12.5 ml bi-distilled water with the eco Testr pH2 and the HANNA DiST HI 98303. All subsamples were measured twice and the results averaged.

In the pursuit of more secure information transfer, advanced nanoelectronic technologies and nanomaterials must be developed. Here, we present a material able to undergo an unprecedented light-pumped directional charge transfer process reminiscent of toppling dominoes. The material is based on ortho-fluorinated azobenzene molecules which are organized in molecular rows by the regular array of a metal-organic framework. The azobenzene molecules undergo light-induced transcis forward as well as electrocatalytic cistrans backward isomerization. Our findings reveal that electron hopping occurs in a sequential and propagating manner between the light-generated cis isomers along with an isomerization of the sample to the trans state. Thus, light can be used to locally write information, which subsequently can be read out by the transferred charge with simultaneous deletion of the information. This freely repeatable, self-erasing domino information transfer is a groundbreaking new mechanism to process information on the molecular level that may find application in encryption.