Results 41 to 50 of about 1,229 (131)

Electrons, Localization but no Hopping: Disorder as Key for Understanding Charge Transport in Mesoporous Silicon

Small Structures, Volume 6, Issue 4, April 2025.
Temperature‐dependent electrical conductivity measurements reveal in mesoporous silicon a thermally activated transport in extended electronic states. A variation of the thermal activation energies from sample to sample is discussed in terms of microscopic disorder.
Tommy Hofmann, Haider Haseeb, Danny Kojda, Natalia Gostkowska‐Lekner, Klaus Habicht   +4 more
wiley   +1 more source

A broadband study of FRB 20240114A with the Effelsberg 100-m radio telescope

Astronomy & Astrophysics
Context. FRB 20240114A is a hyperactive repeating fast radio burst (FRB) source discovered by the CHIME/FRB Collaboration in January 2024. The source has been followed up by numerous radio telescopes, including MeerKAT, uGMRT, and FAST, and has been ...
Limaye P., Spitler L. G., Manaswini N., Benáček J., Eppel F., Kadler M., Nicotera L., Wongphechauxsorn J.   +7 more
doaj   +1 more source

Searching the Non‐Accreting White Dwarf Population in eROSITA Data

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT eROSITA is the soft X‐ray instrument aboard the Spectrum Roentgen Gamma (SRG) satellite that is most sensitive in the energy range between 0.2 and 2.3 keV. Between December 2019 and December 2021, eROSITA completed four all‐sky surveys, producing all‐sky X‐ray source lists and sky maps of unprecedented depth.
S. Friedrich, C. Maitra, K. Dennerl, A. Schwope, K. Werner, B. Stelzer   +5 more
wiley   +1 more source

Composition Determination from Strain Relaxation in 4D-STEM

Applied Physics Express
Composition determination with high spatial resolution is crucial for device engineering of electronic and optoelectronic systems. While scanning transmission electron microscopy (STEM) can infer material composition from strain with high precision ...
F. Otto, L. Niermann, T. Niermann, M. Lehmann   +3 more
doaj   +1 more source

Das zirkumgalaktische Medium

Physik in unserer Zeit, Volume 56, Issue 1, Page 30-37, January 2025.
Galaxien wie die Milchstraße sind umhüllt von einem gigantischen Kokon aus diffusem Gas. Aktuelle Forschungsergebnisse belegen, dass dieses zirkumgalakische Medium eine entscheidende Rolle für die Entstehung und Entwicklung von Galaxien spielt. Zusammenfassung Als zirkumgalaktisches Medium bezeichnet man die gasförmigen Hüllen von Galaxien, die sich ...
Philipp Richter
wiley   +1 more source

Near-UV Spectrum of the Hexamethylenetetramine Cation

The Astrophysical Journal
Hexamethylenetetramine (HMT; (CH _2 ) _6 N _4 ) is a complex cage-like molecule that forms by the reaction of ammonia with formaldehyde, two of the most prevalent components of ice mantles on interstellar dust grains.
Parker Crandall, Simone Stahl, Alexander A. Breier, Otto Dopfer   +3 more
doaj   +1 more source

Discovery of a runaway star likely ejected by a Type Iax supernova

Astronomy & Astrophysics
Over the past decade, runaway stars believed to originate either as surviving donors of Type Ia supernovae or as partially deflagrated accretors producing Type Iax supernovae, have been identified. While the former have been extensively studied recently,
Bhat A., Hollands M., Dorsch M., Geier S., Heber U., Koester D., Pakmor R., Shen K. J.   +7 more
doaj   +1 more source

Impact of Ion Migration on the Performance and Stability of Perovskite‐Based Tandem Solar Cells

Advanced Energy Materials, Volume 14, Issue 48, December 27, 2024.
Are tandem solar cells truly hysteresis‐free? This study reveals that mobile ions in Si/perovskite and all‐perovskite TSCs cause efficiency losses and hysteresis, especially at fast scan rates. Subcell current‐voltage characterization quantifies ionic losses in specific subcells and demonstrates the dominant impact of these losses for degradation ...
Sahil Shah, Fengjiu Yang, Eike Köhnen, Esma Ugur, Mark Khenkin, Jarla Thiesbrummel, Bor Li, Lucas Holte, Sebastian Berwig, Florian Scherler, Paria Forozi, Jonas Diekmann, Francisco Peña‐Camargo, Marko Remec, Nikhil Kalasariya, Erkan Aydin, Felix Lang, Henry Snaith, Dieter Neher, Stefaan De Wolf, Carolin Ulbrich, Steve Albrecht, Martin Stolterfoht   +22 more
wiley   +1 more source

Distributed Feedback Lasing in Thermally Imprinted Phase‐Stabilized CsPbI3 Thin Films

Advanced Functional Materials, Volume 34, Issue 45, November 5, 2024.
The first distributed feedback (DFB) laser based on a CsPbI3 thin film is fabricated by thermal nanoimprint. The additive polyvinyl pyrrolidone (PVP) ensures phase stability of the CsPbI3 even under the conditions of thermal imprint. The DFB lasers achieve a low lasing threshold of 45 µJ cm−2 and tunable emission in the deep red spectral region ...
Naho Kurahashi, Manuel Runkel, Cedric Kreusel, Maximilian Schiffer, Timo Maschwitz, Timo Kraus, Kai Oliver Brinkmann, Ralf Heiderhoff, Maximilian Buchmüller, Sven Oliver Schumacher, Julius Brunner, Detlef Rogalla, Sercan Özen, Felix Lang, Yana Vaynzof, Patrick Görrn, Thomas Riedl   +16 more
wiley   +1 more source

Rapid jet ejection from PKS 0215+015 coincident with a high-energy neutrino event

Astronomy & Astrophysics
Aims. We present a new neutrino-blazar multiwavelength-flare coincidence, observed in the blazar PKS 0215+015 that showed a strong multiwavelength outburst in positional and temporal coincidence with the IceCube neutrino track alert IC220225A similar to ...
Eppel F., Kadler M., Ros E., Benke P., Debbrecht L. C., Eich J., Edwards P. G., Giroletti M., Gokus A., Hämmerich S., Heßdörfer J., Janssen M., Kim S., Kirchner D., Kovalev Y. Y., Krichbaum T. P., Ojha R., Paraschos G. F., Rösch F., Schulga W., Sinapius J., Stevens J.   +21 more
doaj   +1 more source