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Can we hear gravitational-wave ‘beats’ in the rhythm of pulsars?

Pulsars suggest that ultra–low-frequency gravitational waves are rippling through the cosmos. The signal seen by international pulsar timing array collaborations in 2023 could come from a stochastic gravitational-wave background—the sum of many distant sources—or from a single nearby binary of supermassive black holes.

To tell these apart, Hideki Asada, and Professor at Hirosaki University, and Shun Yamamoto, researcher at the Graduate School of Science and Technology, Hirosaki University, propose a method that exploits beat phenomena between gravitational waves at nearly the same frequency, searching for their imprint in the tiny shifts of pulsars’ radio-pulse arrival times.

Their work has been published in the Journal of Cosmology and Astroparticle Physics.

World’s largest rays may be diving to extreme depths to build mental maps of vast oceans

Many marine species are no strangers to the depths of the oceans. Some animals, like certain sharks, tuna, or turtles, routinely perform extreme dives, whereas for other species, such behavior has been observed less frequently.

Now, an international team of researchers working in Peru, Indonesia, and New Zealand tagged oceanic manta rays—the largest species of ray—to learn more about the deep-diving behavior of these animals. They published their results in Frontiers in Marine Science.

“We show that, far offshore, oceanic manta rays are capable of diving to depths greater than 1,200 meters, far deeper than previously thought,” says first author Dr. Calvin Beale, who completed his Ph.D. at Murdoch University.

Compact laser-plasma accelerator can generate muons on demand for imaging

Muon beams can now be created in a device that is the length of a ruler.

Researchers at Berkeley Lab presented a foot-long (30 cm) compact laser-plasma accelerator (LPA) that can generate and detect highly directional muon beams. It works by using intense laser pulses to accelerate electron beams, which then create muons in significantly higher numbers and with greater directionality, providing a powerful new alternative for non-destructive imaging of large or concealed objects.

Conventional artificial muon sources are bulky and expensive, which has left many imaging applications reliant on naturally occurring, scarce, and unreliable cosmic rays. The new LPA overcomes these constraints by producing significantly higher muon yields, slashing exposure times from months to minutes, according to the study published in Physical Review Accelerators and Beams.

Mysterious gullies on Mars appear to have been carved by burrowing CO₂ ice blocks

Did life really exist on Mars after all? Unfortunately, there is no conclusive evidence for this yet. Nevertheless, it would seem that some form of life was the driving force behind the mysterious Martian dune gullies. Earth scientist Dr. Lonneke Roelofs from Utrecht University has investigated how these gullies were formed. In a test setup, she observed that blocks of CO2 ice “dug” these gullies in a unique way.

“It felt like I was watching the sandworms in the film Dune,” Roelofs says. Her findings are published in Geophysical Research Letters.

Other researchers had previously suspected that these blocks could play a role in the formation of the gullies. Roelofs has now proven this by having CO2 ice blocks actually dig those gullies in an experiment—a phenomenon that we do not know here on Earth and that had never been observed by anyone before.

3D-printed metamaterials harness complex geometry to dampen mechanical vibrations

In science and engineering, it’s unusual for innovation to come in one fell swoop. It’s more often a painstaking plod through which the extraordinary gradually becomes ordinary.

But we may be at an inflection point along that path when it comes to engineered structures whose are unlike anything seen before in nature, also known as mechanical metamaterials. A team led by researchers at the University of Michigan and the Air Force Research Laboratory (AFRL) has shown how to 3D print intricate tubes that can use their to stymie vibrations.

Such structures could be useful in a variety of applications where people want to dampen vibrations, including transportation, civil engineering and more. The team’s new study, published in the journal Physical Review Applied, builds on decades of theoretical and computational research to create structures that passively impede vibrations trying to move from one end to the other.

Anomalous metal sheds light on ‘impossible’ state between superconductivity and insulation

Researchers at the Niels Bohr Institute, University of Copenhagen, steered very thin conductors from superconductivity to insulation—creating an “impossible,” strange state between the two mutually exclusive states.

Materials research is absolutely crucial when dealing with quantum states. Whatever material is used as the basis for creating controllable quantum states, like if you want to build applications using quantum states for computing, sensing, or communication, the materials often define to what extent you can eliminate the ever-present noise that disturbs or even disrupts the desired “clean” quantum states or signals. It is an ongoing battle.

The team led by Saulius Vaitiekenas, associate professor at the Niels Bohr Institute, has succeeded in creating what is supposed to be an impossible intermediate state between superconductor = absolutely no resistance or loss of electrical connection—and total insulation = complete shut-off of the electrical signal.

How a fabric patch uses static electricity in your clothes to let you chat with AI and control smart devices

There could soon be a new way to interact with your favorite AI chatbots—through the clothing you wear. An international team of researchers has developed a voice-sensing fabric called A-Textile. This flexible patch of smart material turns everyday garments into a kind of microphone, allowing you to speak commands directly to what you’re wearing. This lets you communicate with AI systems such as ChatGPT or smart home devices.

Wearable devices that sense and interact with the world around us have long been the stuff of science fiction dreams. However, traditional sensors currently in use are often bulky, rigid and uncomfortable. They also lack sensitivity, meaning they struggle to hear soft or normal speaking voices, making it hard for AI to understand commands.

The researchers addressed this issue by exploring triboelectricity, the principle behind static electricity. A-Textile is a multi-layered fabric, and as you move the layers, they rub together to create a tiny electrostatic charge on the fabric. When you speak, the cause the charged layers to vibrate slightly, generating an that represents your voice. To boost the signal, the team embedded flower-shaped nanoparticles into the fabric to help capture the charge and prevent it from dissipating. This ensures it is clear enough to be recognized by AI.

Deep blue organic light-emitting diode operates at just 1.5 V

A deep blue organic light-emitting diode (OLED) developed by researchers at Science Tokyo operates on just a single 1.5 V, overcoming the high-voltage and color-purity problems that have long limited blue OLEDs. The breakthrough was achieved by introducing a new molecular dopant that prevents charge trapping, a problem that previously hampered the performance of low-voltage OLEDs. The resulting device produces sharp blue emissions that meet BT.2020 standards, paving the way towards brighter, more energy-efficient displays.

Organic light-emitting diodes (OLEDs) are widely used in large-screen televisions and smartphone displays. Yet, among the three primary colors needed for full-color technology—red, green, and blue—the blue emitters remain the most challenging. They demand higher energy, often requiring driving voltages above 3 V, and suffer from limited long-term stability.

Now, the research team led by Associate Professor Seiichiro Izawa of the Materials and Structures Laboratory at Institute of Science Tokyo (Science Tokyo), Japan, has achieved a breakthrough in the field of OLEDs. The research team also included Professor Yutaka Majima, doctoral students Qing-jun Shui and Hiroto Iwasaki, and Master’s student Daiki Nakahigashi, all from the Frontier Materials Research Institute, Science Tokyo. They developed a deep blue OLED capable of being powered by just a single 1.5 V battery.

Researchers achieve atomic-scale control of quantum interference

In a study published in Nature Communications, a research team demonstrates the all-electrical control of quantum interference in individual atomic spins on a surface.

Quantum interference arises when a system exists in a superposition of states, with relative phases producing constructive or . An example is Landau-Zener-Stückelberg-Majorana (LZSM) interference, which arises when a quantum two-level system is repeatedly driven through an anticrossing in the energy-level diagram, and undergoes multiple nonadiabatic transitions.

This mechanism is a powerful tool for fast and reliable quantum control, but it remains a significant challenge to achieve tunable LZSM interference in an atomic-scale quantum architecture where multiple spins can be precisely assembled and controllably coupled on demand.

Quantum crystals offer a blueprint for the future of computing and chemistry

Imagine industrial processes that make materials or chemical compounds faster, cheaper, and with fewer steps than ever before. Imagine processing information in your laptop in seconds instead of minutes or a supercomputer that learns and adapts as efficiently as the human brain. These possibilities all hinge on the same thing: how electrons interact in matter.

A team of Auburn University scientists has now designed a new class of materials that gives scientists unprecedented control over these tiny particles. Their study, published in ACS Materials Letters, introduces the tunable coupling between isolated-metal molecular complexes, known as solvated electron precursors, where electrons aren’t locked to atoms but instead float freely in open spaces.

From their key role in energy transfer, bonding, and conductivity, electrons are the lifeblood of chemical synthesis and modern technology. In , electrons drive redox reactions, enable bond formation, and are critical in catalysis. In technological applications, manipulating the flow and interactions between electrons determines the operation of electronic devices, AI algorithms, photovoltaic applications, and even . In most materials, electrons are bound tightly to atoms, which limits how they can be used. But in electrides, electrons roam freely, creating entirely new possibilities.

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