Physics


- Theoretical modeling shows that designer materials incorporating drum-like membranes allow precise stoppage and reversal of sound pulses University of Oregon EUGENE, Ore. -- April 16, 2021 -- University of Oregon physicists have developed a new method to manipulate sound -- stop it, reverse it, store it and even use it later -- in synthetic composite structures known as metamaterials. The discovery was made using theoretical and computational analysis of the mechanical vibrations of thin ... [Read More]


- Encoding information into light, and transmitting it through optical fibers lies at the core of optical communications. With an incredibly low loss of 0.2 dB/km, optical fibers made from silica have laid the foundations of today’s global telecommunication networks and our information society. Such ultralow optical loss is equally essential for integrated photonics, which enable the synthesis, processing and detection of optical signals using on-chip waveguides. Today, a number of innovative ... [Read More]


- When the Electron Ion Collider received the go-ahead in January 2020, it became the only new major accelerator in the works anywhere in the world. "All the stars aligned," said Elke-Caroline Aschenauer, Brookhaven National Laboratory Staff Scientist and a leader in developing the EIC plans. "We have the technology to build this unique particle accelerator and detector to do the measurements that, together with the underlying theory, can for the first time provide answers to longstanding ... [Read More]

Source: phys.org

- Researchers in the Netherlands have established an entanglement-based network between three quantum processors for the first time. Three nodes that can store and process quantum bits were linked to create the world's first rudimentary quantum network. Researchers in the Netherlands have successfully connected three separate quantum processors in what is effectively the world's first multi-node quantum network. This paves the way for a large-scale quantum internet that governments and scientists ... [Read More]

Source: zdnet.com

- A quantum spin liquid is a state of matter in which interacting quantum spins do not align even at lowest temperatures, but remain disordered. Research on this state has been going on for almost 50 years, but whether it really exists has never been proven beyond doubt. An international team has now put an end to the dream of a quantum spin liquid for the time being. Nevertheless, the matter remains exciting. When temperatures drop below zero degrees Celsius, water turns to ice. But does ... [Read More]


- Researchers have produced the lightest version of a uranium atom ever. It has only 122 neutrons compared with the 146 neutrons found in more than 99 per cent of the world’s naturally occurring uranium, which is known as uranium-238. Isotopes of an element always have the same number of protons - in uranium’s case, 92 - but differing numbers of neutrons. Isotopes are labelled by the total number of protons and neutrons that their nuclei contain, and the new isotope has the lowest number of ... [Read More]


- A new review published in The European Physical Journal H by Clara Matteuzzi, Research Director at the National Institute for Nuclear Physics (INFN) and former tenured professor at the University of Milan, and her colleagues, examines almost three decades of the LHCb experiment—from its conception to operation at the Large Hadron Collider (LHC) - documenting its achievements and future potential. The LCHb experiment was originally conceived to understand the symmetry between matter and ... [Read More]

Source: phys.org

- Hafnium-based thin films, with a thickness of only a few nanometres, show an unconventional form of ferroelectricity. This allows the construction of nanometre-sized memories or logic devices. However, it was not clear how ferroelectricity could occur at this scale. A study has now shown how atoms move in a hafnium-based capacitor: migrating oxygen atoms (or vacancies) are responsible for the observed switching and storage of charge. Hafnium-based thin films, with a thickness of only a few ... [Read More]


- Dark matter may make up the vast majority of the matter in the universe, but it’s strangely shy about making its presence known. Now, physicists have designed a new test to search for signs of two candidate particles, using the quirky world of quantum technology. Regular matter – the stuff that makes up seas and stars, people and planets, and basically everything that we interact with every day – only accounts for about 15 percent of all the matter in the universe. The remaining 85 ... [Read More]

Source: newatlas.com

- Researchers have developed a method to change a cellular material's fundamental topology at the microscale. Reconfigurable materials can do amazing things. Flat sheets transform into a face. An extruded cube transforms into dozens of different shapes. But there's one thing a reconfigurable material has yet to be able to change: its underlying topology. A reconfigurable material with 100 cells will always have 100 cells, even if those cells are stretched or squashed. Now, researchers from the ... [Read More]


- New research shows how to measure the super-short bursts of high-frequency light emitted from free electron lasers (FELs). By using the light-induced ionization itself to create a femtosecond optical shutter, the technique encodes the electric field of the FEL pulse in a visible light pulse so that it can be measured with a standard, slow, visible-light camera. "This work has the potential to lead to a new online diagnostic for FELs, where the exact pulse shape of each light pulse can be ... [Read More]

Source: phys.org

- The properties of carbon-based nanomaterials can be altered and engineered through the deliberate introduction of certain structural "imperfections" or defects. The challenge, however, is to control the number and type of these defects. In the case of carbon nanotubes – microscopically small tubular compounds that emit light in the near-infrared – chemists and materials scientists at Heidelberg University led by Prof. Dr. Jana Zaumseil have now demonstrated a new reaction pathway to enable ... [Read More]


- This event was predicted in 1973 but had never been seen in the real world. A never-before-seen particle has revealed itself in the hot guts of two particle colliders, confirming a half-century-old theory. Scientists predicted the existence of the particle, known as the odderon, in 1973, describing it as a rare, short-lived conjointment of three smaller particles known as gluons. Since then, researchers have suspected that the odderon might appear when protons slammed together at extreme ... [Read More]


- You can’t see it. You can’t feel it. But the substance scientists refer to as dark matter could account for five times as much "stuff" in the universe as the regular matter that forms everything from trees, trains and the air you breathe, to stars, planets and interstellar dust clouds. Though scientists see the signature of dark matter indirectly in the way large objects orbit one another — particularly how stars swirl around the centers of spiral galaxies — no one knows yet what ... [Read More]


- Extremely precise measurements are possible using atom interferometers that employ the wave character of atoms for this purpose. They can thus be used, for example, to measure the gravitational field of the Earth or to detect gravitational waves. A team of scientists from Germany has now managed to successfully perform atom interferometry in space for the first time—on board a sounding rocket. "We have established the technological basis for atom interferometry on board of a sounding rocket ... [Read More]

Source: phys.org

- It’s an example of how surprising properties can spontaneously emerge in complex materials – a phenomenon scientists hope to harness for novel technologies. Creating a two-dimensional material, just a few atoms thick, is often an arduous process requiring sophisticated equipment. So scientists were surprised to see 2D puddles emerge inside a three-dimensional superconductor – a material that allows electrons to travel with 100% efficiency and zero resistance – with no prompting. Within ... [Read More]