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Category: particle physics – Page 36

A research group recently discovered the disappearance of nonreciprocal second harmonic generation (SHG) in MnPSe₃ when integrated into a two-dimensional (2D) antiferromagnetic MnPSe₃/graphene heterojunction.

The research, published in Nano Letters, highlights the role of interfacial magnon-plasmon coupling in this phenomenon.

2D van der Waals magnetic/non-magnetic heterojunctions hold significant promise for spintronic devices. Achieving these functionalities hinges on the interfacial proximity effect, a critical factor. However, detecting the proximity effect in 2D antiferromagnetic/non-magnetic heterojunctions presents considerable challenges, due to the small size and weak signals associated with these structures.

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A new trick for illuminating the internal ordering within a special type of magnet could help engineers build better memory-storage devices. Developed by RIKEN physicists, this technique could make memory devices less corruptible.

The work is published in the journal Nature Communications.

Conventional hard disks are based on ferromagnets—materials in which the , or spins, associated with each atom all point in the same direction. This alignment gives the material a net . Data is stored by creating different magnetization patterns across the material.

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Physicists have performed a groundbreaking simulation they say sheds new light on an elusive phenomenon that could determine the ultimate fate of the Universe.

Pioneering research in quantum field theory around 50 years ago proposed that the universe may be trapped in a false vacuum – meaning it appears stable but in fact could be on the verge of transitioning to an even more stable, true vacuum state. While this process could trigger a catastrophic change in the Universe’s structure, experts agree that predicting the timeline is challenging, but it is likely to occur over an astronomically long period, potentially spanning millions of years.

In an international collaboration between three research institutions, the team report gaining valuable insights into false vacuum decay – a process linked to the origins of the cosmos and the behaviour of particles at the smallest scales. The collaboration was led by Professor Zlatko Papic, from the University of Leeds, and Dr Jaka Vodeb, from the Jülich Supercomputing Centre (JSC) at Forschungszentrum Jülich, Germany.

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A groundbreaking study reveals that Alpha Centauri’s particles are already making their way into our solar system, traveling across the cosmic highway that connects star systems. These particles, ejected from the nearest stellar neighbor to Earth, could be carrying valuable insights about distant worlds and the forces that shape our galaxy.

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Read “” by Sebastian Schepis on Medium.

Imagine a world where thoughts aren’t confined to the brain, but instantly shared across a vast network of neurons, transcending the limits of space and time. This isn’t science fiction, but a possibility hinted at by one of the most puzzling aspects of quantum physics: entanglement.

Quantum entanglement, famously dubbed spooky action at a distance by Einstein, describes a phenomenon where two or more particles become intrinsically linked. They share a quantum state, no matter how far apart they are. Change one entangled particle, and its partner instantly reacts, even across vast distances.

This property, which troubled Einstein, has been repeatedly confirmed through experiments, notably by physicist John Clauser and his colleagues, who received the 2022 Nobel Prize in Physics for their groundbreaking work on quantum entanglement.

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Researchers have discovered that superconducting nanowire photon.

A photon is a particle of light. It is the basic unit of light and other electromagnetic radiation, and is responsible for the electromagnetic force, one of the four fundamental forces of nature. Photons have no mass, but they do have energy and momentum. They travel at the speed of light in a vacuum, and can have different wavelengths, which correspond to different colors of light. Photons can also have different energies, which correspond to different frequencies of light.

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The Anderson transition is a phase transition that occurs in disordered systems, which entails a shift from a diffusive state (i.e., in which waves or particles are spread out) to a localized state, in which they are trapped in specific regions. This state was first studied by physicist Philip W. Anderson, who examined the arrangement of electrons in disordered solids, yet it was later found to also apply to the propagation of light and other waves.

Researchers at Missouri University of Science & Technology, Yale University, and Grenoble Alpes University in France recently set out to further explore the Anderson transition for light (i.e., electromagnetic waves) in 3D disordered systems.

Their paper, published in Physical Review Letters, outlines the simulation of light wave transport in an arrangement of perfect-electric-conducting (PEC) spheres, materials that reflect electromagnetic waves.

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A research team from the University of Science and Technology of China has demonstrated the ability to electrically manipulate the spin filling sequence in a bilayer graphene (BLG) quantum dot (QD). This achievement, published in Physical Review Letters, showcases the potential to control the spin degree of freedom in BLG, a material with promising applications in quantum computing and advanced electronics.

BLG has drawn extensive attention in recent years due to its . When an out-of-plane electric field is applied, it can generate a tunable band gap. Moreover, the trigonal warping effect, caused by the skew interlayer coupling, gives rise to additional minivalley degeneracy, greatly influencing the behavior of charge carriers. Quantum dot devices, which can precisely control the number of charge carriers, have become a crucial tool for studying these phenomena at the single-particle level.

The research team delved into the intricate dynamics of electron shell structures within quantum dot, focusing on how these structures can be manipulated through the trigonal warping effect, a unique feature of bilayer graphene. They employed a highly tunable quantum dot device, which provided the means to control the electron filling sequence. They began by applying a small perpendicular electric field, observing that the s-shell filled with four electrons, two with spin-up and two with spin-down, each from opposite valleys.

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Three and a half kilometers beneath the Mediterranean Sea, around 80km off the coast of Sicily, lies half of a very unusual telescope called KM3NeT.

The enormous device is still under construction, but today the telescope’s scientific team announced they have already detected a particle from with a staggering amount of energy.

In fact, as the team report in Nature, they found the most energetic neutrino anyone has ever seen—and it represents a tremendous leap forward in exploring the uncharted waters of the extreme universe.

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