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Archive for the ‘materials’ category: Page 22

Jun 14, 2024

Counterfeit Titanium Found In Some Boeing And Airbus Jets

Posted by in categories: materials, transportation

So what else is faked material and what is structural integrity in the world of fakes?


“The planes that included components made with the material were built between 2019 and 2023, among them some Boeing 737 Max…”

Jun 14, 2024

Temperature-Dependent Excitonic Light Manipulation with Atomically Thin Optical Elements

Posted by in category: materials

Monolayer 2D semiconductors, such as WS2, exhibit uniquely strong light–matter interactions due to exciton resonances that enable atomically thin optical elements. Similar to geometry-dependent plasmon and Mie resonances, these intrinsic material resonances offer coherent and tunable light scattering. Thus far, the impact of the excitons’ temporal dynamics on the performance of such excitonic metasurfaces remains unexplored. Here, we show how the excitonic decay rates dictate the focusing efficiency of an atomically thin lens carved directly out of exfoliated monolayer WS2. By isolating the coherent exciton radiation from the incoherent background in the focus of the lens, we obtain a direct measure of the role of exciton radiation in wavefront shaping. Furthermore, we investigate the influence of exciton–phonon scattering by characterizing the focusing efficiency as a function of temperature, demonstrating an increased optical efficiency at cryogenic temperatures. Our results provide valuable insights into the role of excitonic light scattering in 2D nanophotonic devices.

Jun 13, 2024

Data as the next challenge in atomistic machine learning

Posted by in categories: materials, robotics/AI

As machine learning models are becoming mainstream tools for molecular and materials research, there is an urgent need to improve the nature, quality, and accessibility of atomistic data. In turn, there are opportunities for a new generation of generally applicable datasets and distillable models.

Jun 12, 2024

New theory links quantum geometry to electron-phonon coupling

Posted by in categories: materials, quantum physics

A new study published in Nature Physics introduces a theory of electron-phonon coupling that is affected by the quantum geometry of the electronic wavefunctions.

The movement of electrons in a lattice and their interactions with the lattice vibrations (or phonons) play a pivotal role in phenomena like superconductivity (resistance-free conductivity).

Electron-phonon coupling (EPC) is the interaction between free electrons and phonons, which are quasiparticles representing the vibrations of a crystal lattice. EPC leads to the formation of Cooper pairs (pairs of electrons), responsible for superconductivity in certain materials.

Jun 12, 2024

Researchers leverage inkjet printing to make a portable multispectral 3D camera

Posted by in categories: materials, robotics/AI

Researchers have used inkjet printing to create a compact multispectral version of a light field camera. The camera, which fits in the palm of the hand, could be useful for many applications including autonomous driving, classification of recycled materials and remote sensing.

Jun 12, 2024

Researchers unveil the dynamical nature of emergent magnetic monopoles in real magnets for the first time

Posted by in category: materials

Recently, researchers discovered that a material called manganese germanide (MnGe) has a unique periodic structure, formed by special magnetic configurations called hedgehogs and antihedgehogs, which is called a magnetic lattice.

In these special configurations, the point radially outward (hedgehog) or inward (antihedgehog), resembling the spines of a hedgehog. These hedgehogs and antihedgehogs act like and antimonopoles, serving as sources or sinks of emergent magnetic fields.

MnGe exhibits what is known as a triple-Q hedgehog lattice. However, recent experiments have shown that the substitution of Ge with Si (MnSi1-x Gex) transforms the arrangement into the quadruple-Q hedgehog lattice (4Q-HL).

Jun 12, 2024

Compressed titanium and sulfur nanoribbons can transmit electricity without energy loss, scientists find

Posted by in categories: energy, materials

When compressed, nanoribbons of titanium and sulfur can change properties dramatically, turning into materials with the ability to conduct electricity without losing energy, according to a study published in the journal Nano Letters.

Jun 12, 2024

Thermoelectric effect between two liquid materials observed for the first time

Posted by in categories: materials, physics

A trio of physicists at Sorbonne Université, in France, has observed a thermoelectric effect between two liquid materials for the first time. In their study, published in Proceedings of the National Academy of Sciences, Marlone Vernet, Stephan Fauve and Christophe Gissinger put two types of liquid metals together at room temperature and subjected them to a heat gradient.

Jun 12, 2024

Marine fungus can break down floating plastic pollution

Posted by in category: materials

The plastic-digesting capabilities of the fungus Parengyodontium album could be harnessed to degrade polyethylene, the most abundant type of plastic in the ocean.

By Adrian Barnett

Jun 11, 2024

Researchers develop a roadmap for the development of information technology based on 2D materials

Posted by in category: materials

In a significant stride forward for the semiconductor industry, a new review paper from the “Shuang-Qing Forum” offers a comprehensive overview of the advancements and strategic roadmap for two-dimensional (2D) materials.

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