Physics News and Discussions

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Stable magnetic bundles achieved at room temperature and zero magnetic field
https://phys.org/news/2024-05-stable-ma ... ature.html
by Wei Wensen and Zhao Weiwei, Hefei Institutes of Physical Science, Chinese Academy of Sciences

Recently, the research team led by Prof. Du Haifeng from the High Magnetic Field laboratory at Hefei Institutes of Physical Science of the Chinese Academy of Sciences achieved stable magnetic bundles at room temperature without the need for any external magnetic field.

Their work is published in Nature Communications.

Topological magnetic structures are a type of spin arrangement with nontrivial topological properties. These structures hold promise as the next-generation data carriers and could overcome the limitations of traditional magnetic storage technologies in spintronics.

In previous research, the team proposed a method for inducing magnetic skyrmion bundles in a chiral helimagnetic material called FeGe. However, achieving stable magnetic bundles at room temperature and without an external magnetic field remained a significant challenge for practical applications in spintronics.

[weatheriscool]

Physicists create five-lane superhighway for electrons
https://phys.org/news/2024-05-physicist ... trons.html
by Elizabeth A. Thomson, Materials Research Laboratory, Massachusetts Institute of Technology

MIT physicists and colleagues have created a five-lane superhighway for electrons that could allow ultra-efficient electronics and more. The work, reported in the May 9 issue of Science, is one of several important discoveries by the same team over the last year involving a material that is essentially a unique form of pencil lead.

"This discovery has direct implications for low-power electronic devices because no energy is lost during the propagation of electrons, which is not the case in regular materials where the electrons are scattered," says Long Ju, an assistant professor in the MIT Department of Physics and corresponding author of the paper.

The phenomenon is akin to cars traveling down an open turnpike as opposed to those moving through neighborhoods. The neighborhood cars can be stopped or slowed by other drivers making abrupt stops or U-turns that disrupt an otherwise smooth commute.

[weatheriscool]

Method milestone for quantum physics: Rapid test for topological 2D materials
https://phys.org/news/2024-05-method-mi ... rapid.html
by Katja Lesser, Würzburg-Dresdner Exzellenzcluster ct.qmat

Topological quantum materials are hailed as a cornerstone of future technological advancements. Yet, validating their exceptional qualities has always been a lengthy process.

Researchers at the Cluster of Excellence ct.qmat have now developed an experimental technique that systematically identifies two-dimensional topological materials through a rapid test. This breakthrough could help accelerate the progress of this booming class of materials.

Their findings have been published in the journal Physical Review Letters.

In 2007, Professor Laurens W. Molenkamp, a founding member of the Würzburg-Dresden Cluster of Excellence ct.qmat—Complexity and Topology in Quantum Matter—provided the first experimental proof of topological insulators, a novel class of materials. These materials stand out because although their interior behaves like an electrical insulator, they conduct electrons on their surface without any resistance.

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Researchers develop world's smallest quantum light detector on a silicon chip
https://phys.org/news/2024-05-world-sma ... licon.html
by University of Bristol

The silicon ePIC quantum chip, mounted on a printed circuit board for testing and similar to a motherboard inside a personal computer. Credit: University of Bristol

Researchers at the University of Bristol have made an important breakthrough in scaling quantum technology by integrating the world's tiniest quantum light detector onto a silicon chip. The paper, "A Bi-CMOS electronic photonic integrated circuit quantum light detector," was published in Science Advances.

A critical moment in unlocking the information age was when scientists and engineers were first able to miniaturize transistors onto cheap micro-chips in the 1960s.

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Researchers realize multiphoton electron emission with non-classical light
https://phys.org/news/2024-05-multiphot ... sical.html
by Ingrid Fadelli , Phys.org

Strong field quantum optics is a rapidly emerging research topic, which merges elements of non-linear photoemission rooted in strong field physics with the well-established realm of quantum optics. While the distribution of light particles (i.e., photons) has been widely documented both in classical and non-classical light sources, the impact of such distributions on photoemission processes remains poorly understood.

Researchers at Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) and the Max Planck Institute for the Science of Light recently set out to fill this gap in the literature, by exploring the interactions between light and matter with a non-classical light source. Their paper, published in Nature Physics, demonstrates that photon statistics of the driving light source are imprinted on the electron number statistics of emitted electrons from metal needle tips, an observation that could have interesting implications for the future development of optical devices.

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New method can create aquatic levitation at much lower temperature, has implications for cooling nuclear reactors
https://phys.org/news/2024-05-method-aq ... tions.html
by Virginia Tech

Splash a few drops of water on a hot pan and if the pan is hot enough, the water will sizzle and the droplets of water seem to roll and float, hovering above the surface.

The temperature at which this phenomenon, called the Leidenfrost effect, occurs is predictable, usually happening above 230 degrees Celsius. The team of Jiangtao Cheng, associate professor in the Virginia Tech Department of Mechanical Engineering, has discovered a method to create the aquatic levitation at a much lower temperature, and the results have been published in Nature Physics.

[firestar464]

Researchers detect hidden threats with advanced X-ray imaging

https://techxplore.com/news/2024-05-hid ... aging.html

If there's a better thread for this please let me know.

[Powers]

Researchers detect hidden threats with advanced X-ray imaging

https://techxplore.com/news/2024-05-hid ... aging.html

If there's a better thread for this please let me know.

This.

[firestar464]

Quantum time travel: The experiment to 'send a particle into the past'- New Scientist

https://archive.ph/WTfue

[firestar464]

Disputed dark-matter claim to be tested by new lab in South Korea

https://www.nature.com/articles/d41586-024-01347-3