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Metallic non-metals

In theory, most materials are capable of becoming metallic if put under enough pressure. Atoms or molecules can be squeezed together so tightly that they begin to share their outer electrons, which can then travel and conduct electricity as they do in a chunk of copper or iron. Geophysicists think that the centres of massive planets such as Neptune or Uranus host water in such a metallic state, and that high-pressure metallic hydrogen can even become a superconductor, able to conduct electricity without any resistance.

Turning water into a metal in this way would require an expected 15 million atmospheres of pressure, which is out of reach for current lab techniques, says Jungwirth. But he suspected that water could become conductive in an alternative way: by borrowing electrons from alkali metals. These reactive elements in group 1 of the periodic table, which includes sodium and potassium, tend to donate their outermost electron. Last year, Jungwirth and his colleague Phil Mason — a chemist who is also known for making science videos on YouTube — led a team that demonstrated a similar effect in ammonia2. The fact that ammonia can turn shiny in such conditions was known to the British chemist Humphry Davy in the early nineteenth century, Edwards points out.

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Hello and welcome! My name is Anton and in this video, we will talk about a new groundbreaking discovery about a proton — a charm quark on the inside?
Links:
Previous video: https://youtu.be/8BTZOz850GI
Unusual experiment findings: https://youtu.be/jYAsW8OXg7c.
https://www.nature.com/articles/s41586-022-04998-2
https://www.sciencedirect.com/science/article/abs/pii/0370269380903640


https://www.jlab.org/
https://www.mdpi.com/2571-712X/5/2/15
#charm #proton #physics.

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The list of unique architectures in the city keeps growing.

The city has showcased its ability to take on architectural challenges by completing the Palm Jumeirah and keeps unveiling tiny projects along the way, such as the world’s largest Ferris Wheel. So, it is not exactly a moonshot when Dubai thinks of building a Moon styled resort as well.


Moon World Resorts.

The city of Dubai is no stranger to ambitious architectural projects. Last month, we reported how plans were being drawn for a suspended city around the iconic Burj Khalifa, currently the tallest building in the world.

The Sun has been up to some pretty intense shenanigans lately, but a recent eruption on the far side looks to be absolute science gold.

On the evening of September 5 GMT, an enormous coronal mass ejection (CME) was recorded exploding on the far side of the Sun, sending a radiation storm out across the Solar System. It was a type known as a halo CME, in which an expanding halo of hot gas can be seen spewing out around the entire Sun.

Sometimes this means that the CME is headed straight for Earth. However, this eruption was on the far side, so it’s heading away, and we won’t see any of the usual effects of a solar storm here on our home planet.

University of Texas at Dallas physicists and their collaborators at Yale University have demonstrated an atomically thin, intelligent quantum sensor that can simultaneously detect all the fundamental properties of an incoming light wave.

The research, published April 13 in the journal Nature, demonstrates a new concept based on quantum geometry that could find use in health care, deep-space exploration and remote-sensing applications.

“We are excited about this work because typically, when you want to characterize a wave of light, you have to use different instruments to gather information, such as the intensity, wavelength and polarization state of the light. Those instruments are bulky and can occupy a significant area on an optical table,” said Dr. Fan Zhang, a corresponding author of the study and associate professor of physics in the School of Natural Sciences and Mathematics.

An ultracompact circularly polarized light source is a crucial component for the applications of classical and quantum optics information processing. The development of this field relies on the advances of two fields: quantum materials and chiral optical cavities. Conventional approaches for circularly polarized photoluminescence suffer from incoherent broadband emission, limited DOP, and large radiating angles. Their practical applications are constrained by low efficiency and energy waste to undesired handedness and emission directions. The chiral microlasers can have large DOPs and directional output, but only in specific power ranges. Most importantly, their subthreshold performances plummet significantly. Up to now, the strategy for simultaneous control of chiral spontaneous emission and chiral lasing is still absent.

In a new paper published in Science, researchers from Harbin Institute of Technology and Australian National University employ the physics of chiral quasi in the continuum (BICs) and demonstrate the efficient and controllable emission of circularly polarized light from resonant metasurfaces.

BICs with integer topological charge in momentum space and a theoretically infinite Q factor have been explored for many applications including nonlinear optics and lasing. By introducing in-plane asymmetry, BICs turn to be quasi-BICs with finite but still high Q factors. Interestingly, the integer topological charge of BICs mode would split into two half integer charges, which symmetrically distribute in momentum space and correspond to left-and right-handed circular polarization states, also known as C points.