Explanipedia

Relating the dynamics of photo de-mixing in mixed bromide-iodide perovskites to ionic and electronic transport Open

Yaru Wang, Marko Mladenović, Wilfried Sigle, Jovana V. Milić · 2025

The observation of reversible de-mixing phenomena in mixed-halide perovskites under illumination is one of the most challenging as well as intriguing aspects of this class of materials. On the one hand, it poses critical constraints to the…

Ultrafast phonon-mediated dephasing of color centers in hexagonal boron nitride probed by electron beams Open

Masoud Taleb, Paul Bittorf, Maximilian Black, Mario Hentschel, Wilfried Sigle , et al. · 2025

Atomic-scale observation of geometric frustration in a fluorine-intercalated infinite layer nickelate superlattice Open

Chao Yang, R. A. Ortiz, Hongguang Wang, Wilfried Sigle, Kelvin Anggara , et al. · 2024

Anion doping offers immense potential for tailoring material properties, but achieving precise control over anion incorporation remains a challenge due to complex synthesis processes and limitations in local dopant detection. Here, we inve…

Ultrafast phonon-mediated dephasing of color centers in hexagonal boron nitride probed by electron beams Open

Nahid Talebi, Masoud Taleb, Paul Bittorf, Maximilian Black, Mario Hentschel , et al. · 2024

Defect centers in hexagonal boron nitride (hBN) have been extensively studied as room-temperature single-photon sources. The electronic structure of these defects exhibits strong coupling to phonons, as evidenced by the observation of phon…

Ultrafast phonon-mediated dephasing of color centers in hexagonal boron nitride probed by electron beams Open

Masoud Taleb, Paul Bittorf, Mximilian Black, Mario Hentschel, Wilfried Sigle , et al. · 2024

Defect centers in hexagonal boron nitride have been extensively studied as room temperature single photon sources. The electronic structure of these defects exhibits strong coupling to phonons, as evidenced by the observation of phonon sid…

Kink-pair mechanism and low temperature flow-stress behaviour of strontium titanate single crystals Open

Miguel Castillo‐Rodríguez, Wilfried Sigle · 2024

The mechanical behaviour of strontium titanate exhibits a remarkable behaviour at low temperature, in the so called regime A, where the flow stress experiences two different temperature dependences separated by a noticeably abrupt drop in …

Direct observation of strong surface reconstruction in partially reduced nickelate films Open

Chao Yang, Rebecca Pons, Wilfried Sigle, Hongguang Wang, E. Benckiser , et al. · 2024

Surface Polarity Dynamics and Strong Reconstruction in Partially Reduced Nickelate Films Open

Peter A. van Aken, Chao Yang, Rebecca Pons, Wilfried Sigle, Hongguang Wang , et al. · 2024

Atomic Insights of Interface Polarity in NdNiO2/SrTiO3 Superlattices Open

Chao Yang, R. A. Ortiz, Yi Wang, Wilfried Sigle, Hongguang Wang , et al. · 2023

Journal Article Atomic Insights of Interface Polarity in NdNiO2/SrTiO3 Superlattices Get access Chao Yang, Chao Yang Max Planck Institute for Solid State Research, Stuttgart, Germany Corresponding author: [email protected] Search for other…

Experimental evidence of a size-dependent sign change of the Seebeck coefficient of Bi nanowire arrays Open

Michael F. Wagner, Anna Sarina Paulus, Wilfried Sigle, Joachim Brötz, C. Trautmann , et al. · 2023

Thickness-Dependent Interface Polarity in Infinite-Layer Nickelate Superlattices Open

Chao Yang, R. A. Ortiz, Yi Wang, Wilfried Sigle, Hongguang Wang , et al. · 2023

The interface polarity plays a vital role in the physical properties of oxide heterointerfaces because it can cause specific modifications of the electronic and atomic structure. Reconstruction due to the strong polarity of the NdNiO_2…

Employing High-temperature-grown SrZrO$_3$ Buffer to Enhance the Electron Mobility in La:BaSnO$_3$-based Heterostructures Open

Prosper Ngabonziza, Jisung Park, Wilfried Sigle, Peter A. van Aken, J. Mannhart , et al. · 2023

We report a synthetic route to achieve high electron mobility at room temperature in epitaxial La:BaSnO$_3$/SrZrO$_3$ heterostructures prepared on several oxide substrates. Room-temperature mobilities of 157, 145, and 143 cm$^2$V$^{-1}$s$^…

Three-dimensional free-standing gold nanowire networks as a platform for catalytic applications Open

Mohan Li, Nils Ulrich, Ina Schubert, Wilfried Sigle, Michael F. Wagner , et al. · 2023

Highly interconnected Au nanowire networks synthesized by electrodeposition in etched ion-track polymer templates show promising catalytic performance for methanol oxidation reaction.

Combined spectroscopy and electrical characterization of La:BaSnO3 thin films and heterostructures Open

Arnaud P. Nono Tchiomo, Emanuela Carleschi, A. R. E. Prinsloo, Wilfried Sigle, Peter A. van Aken , et al. · 2022

For La-doped BaSnO3 thin films grown by pulsed laser deposition, we combine chemical surface characterization and electronic transport studies to probe the evolution of electronic states in the band structure for different La-doping conten…

Probing Grain-boundary Structure and Electrostatic Characteristics in a SrTiO3 Bi-crystal by 4D-STEM Open

Chao Yang, Yi Wang, Wilfried Sigle, Peter A. van Aken · 2022

Journal Article Probing Grain-boundary Structure and Electrostatic Characteristics in a SrTiO3 Bi-crystal by 4D-STEM Get access Chao Yang, Chao Yang Max Planck Institute for Solid State Research, Stuttgart, Germany Corresponding author: C.…

Combined Spectroscopy and Electrical Characterization of La:BaSnO$_\text{3}$ Thin Films and Heterostructures Open

Arnaud P. Nono Tchiomo, Emanuela Carleschi, A. R. E. Prinsloo, Wilfried Sigle, Peter A. van Aken , et al. · 2022

For La-doped BaSnO$_\text{3}$ thin films grown by pulsed laser deposition, we combine chemical surface characterization and electronic transport studies to probe the evolution of electronic states in the band structure for different La-dop…

Ruddlesden–Popper Faults in NdNiO3 Thin Films Open

Chao Yang, Yi Wang, Daniel Putzky, Wilfried Sigle, Hongguang Wang , et al. · 2022

The NdNiO3 (NNO) system has attracted a considerable amount of attention owing to the discovery of superconductivity in Nd0.8Sr0.2NiO2. In rare-earth nickelates, Ruddlesden–Popper (RP) faults play a significant role in functional propertie…

Determination of Grain-Boundary Structure and Electrostatic Characteristics in a SrTiO3 Bicrystal by Four-Dimensional Electron Microscopy Open

Chao Yang, Yi Wang, Wilfried Sigle, Peter A. van Aken · 2021

The grain boundary (GB) plays a critical role in a material's properties and device performance. Therefore, the characterization of a GB's atomic structure and electrostatic characteristics is a matter of great importance for materials sci…

Catalyzing Bond‐Dissociation in Graphene via Alkali‐Iodide Molecules Open

Nilesh Vats, Devendra Singh Negi, Deobrat Singh, Wilfried Sigle, Sabine Abb , et al. · 2021

Atomic design of a 2D‐material such as graphene can be substantially influenced by etching, deliberately induced in a transmission electron microscope. It is achieved primarily by overcoming the threshold energy for defect formation by con…

Ion transport in nanocrystalline CaF2 films Open

Robert Usiskin, Wilfried Sigle, Marion Kelsch, Peter A. van Aken, Joachim Maier · 2021

This work investigates the conductivity and structure of nanocrystalline CaF2 films grown at 200 °C by thermal evaporation. The in-plane conductivity is enhanced by several orders of magnitude compared to lightly doped bulk samples of CaF2…

Optical properties of freestanding GaN nanomembranes using monochromated valence-EELS Open

M. Benaı̈ssa, Wilfried Sigle, Ismail Ben Abdallah, Rami T. ElAfandy, Tien Khee Ng , et al. · 2021

Effects of Size Reduction on the Electrical Transport Properties of 3D Bi Nanowire Networks Open

Michael F. Wagner, Anna Sarina Paulus, Joachim Brötz, Wilfried Sigle, C. Trautmann , et al. · 2021

3D nanowire networks are fascinating systems for future microelectronic devices. They can be handled like macroscopic objects, while exhibiting properties of nanoscale materials. Here, the fabrication of free‐standing 3D bismuth nanowire n…

Probing plasmonic excitation mechanisms and far-field radiation of single-crystalline gold tapers with electrons Open

Robin Lingstädt, Nahid Talebi, Surong Guo, Wilfried Sigle, Alfredo Campos , et al. · 2020

Conical metallic tapers represent an intriguing subclass of metallic nanostructures, as their plasmonic properties show interesting characteristics in strong correlation to their geometrical properties. This is important for possible appli…

Atomic-scale Identification of High-temperature Superconductivity at La2CuO4 Interfaces Open

Y. Eren Suyolcu, Federico Baiutti, Yi Wang, Wilfried Sigle, G. Christiani , et al. · 2020

Complex oxide thin films and heterostructures host novel functionalities and have stimulated large interest recently due to the ability to tailor physical properties at the atomic scale.Intriguing effects are induced by complex interaction…

Substrate-Selective Morphology of Cesium Iodide Clusters on Graphene Open

Nilesh Vats, Yi Wang, Suman Sen, Sven Szilagyi, Hannah Ochner , et al. · 2020

Formation and characterization of low-dimensional nanostructures is crucial for controlling the properties of two-dimensional (2D) materials such as graphene. Here, we study the structure of low-dimensional adsorbates of cesium iodide (CsI…

Surface Plasmon Resonance Effects In A Perforated Ag Film Studied By Energy-Filtering Tem Open

Wilfried Sigle, Jaysen Nelayah, Christoph T. Koch, Burcu Ögüt, Peter A. van Aken · 2020

The visualization of localized surface plasmon resonances (LSPR) on the nanometer scale in combination with spectral information over the entire visible range is of prime importance in the field of biosensors, surface-enhanced Raman spectr…

Mapping Grain Boundary Potentials In Ceramics By Nonlinear Inline Electron Holography And Impedance Spectroscopy Open

Christoph T. Koch, B. Rahmati, Wilfried Sigle, Mona Shirpour, Rotraut Merkle , et al. · 2020

The electrostatic potential arising from charge bound at grain boundary cores in ceramics and the accumulation of space charge in their vicinity is in many cases made responsible for the ion blocking or conducting behavior of electrocerami…

Analytical Transmission Electron Microscopy Open

Wilfried Sigle · 2020

▪ Abstract Chemical analysis at high spatial resolution is the domain of analytical transmission electron microscopy. Owing to rapid instrumental developments during the past decade, electron energy-loss spectroscopy offers now a spatial r…

Dislocation Microstructure In Strontium Titanate Plastically Deformed At Low Temperature Open

Miguel Castillo‐Rodríguez, Wilfried Sigle · 2020

Study Of Surface Plasmon Resonances On Assemblies Of Slits In Thin Ag Films By Low-Loss Eftem Imaging Open

Burcu Ögüt, Wilfried Sigle, Jaysen Nelayah, Christoph T. Koch, Peter A. van Aken · 2020

With the ongoing developments in nanotechnology, surface plasmon resonances (SPRs) have started to play a crucial role in many different areas of science. Surface Plasmon resonances are described as collective oscillations in the valence e…

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