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Category: materials

Senate Votes to Allow State A.I. Laws, a Blow to Tech Companies

There are no federal laws regulating A.I. but states have enacted dozens of laws that strengthen consumer privacy, ban A.I.-generated child sexual abuse material and outlaw deepfake videos of political candidates. All but a handful of states have some laws regulating artificial intelligence in place. It is an area of deep interest: All 50 have introduced bills in the past year tied to the issue.

The Senate’s provision, introduced in the Senate by Senator Ted Cruz, Republican of Texas, sparked intense criticism by state attorneys general, child safety groups and consumer advocates who warned the amendment would give A.I. companies a clear runway to develop unproven and potentially dangerous technologies.

Breaking Ohm’s law: Nonlinear currents emerge in symmetry-broken materials

In a review just published in Nature Materials, researchers take aim at the oldest principle in electronics: Ohm’s law.

Their article, “Nonlinear transport in non-centrosymmetric systems,” brings together rapidly growing evidence that, when a material lacks inversion symmetry, the familiar linear relation between current and voltage can break down, giving rise to striking quadratic responses.

The study was led by Manuel Suárez-Rodríguez—working under the guidance of Ikerbasque Professors Fèlix Casanova and Luis E. Hueso at CIC nanoGUNE, together with Prof. Marco Gobbi at the Materials Physics Center (CFM, CSIC-UPV/EHU).

Radiation Imbalance: New Material Emits Better Than It Absorbs

A newly designed structure exhibits the largest-recorded emissivity–absorptivity difference, a property that could prove useful in energy-harvesting and cloaking devices.

Hot objects glow. From the warmth of a stovetop to the invisible heat radiating from a building’s roof, thermal radiation flows outward. But it also flows inward in a reciprocal manner. This means that at thermal equilibrium, an object’s ability to thermally emit light in one direction, described as emissivity, is equal to its ability to absorb the same light coming in from the other direction, known as absorptivity. But what if this rule could be violated?

In a new study, Zhenong Zhang and colleagues from Pennsylvania State University demonstrate this exciting possibility [1]. The researchers apply an external magnetic field to a layered material, creating a system that breaks Lorentz reciprocity—a common symmetry that relates electromagnetic inputs and outputs. They then show that this nonreciprocal system exhibits much higher emissivity than absorptivity in the same direction. The observed difference between emissivity and absorptivity is twice that observed in previous experiments, thus setting a new benchmark in the field. These results pave the way for future technologies such as thermal diodes, radiative heat engines, and infrared camouflage.

Breaking the Rules of Magnetism: Unusual Crystal Surprises Physicists With Cooling Effect

The research team has identified atacamite as a material with magnetocaloric properties. Natural crystals have long captivated us with their vivid colors, flawless geometry, and striking symmetry. But for scientists, these beautiful formations offer more than just visual delight. Hidden within thei

Physicists Catch Light in ‘Imaginary Time’ in Scientific First

For the first time, researchers have seen how light behaves during a mysterious phenomenon called ‘imaginary time’

When you shine light through almost any transparent material, the gridlock of electromagnetic fields that make up the atomic alleys and side streets will add a significant amount of time to each photon’s commute.

This delay can tell physicists a lot about how light scatters, revealing details about the matrix of material the photons must navigate. Yet until now, one trick up the theorist’s sleeve for measuring light’s journey – invoking imaginary time – has not been fully understood in practical terms.

Discovery in quantum materials could make electronics 1,000 times faster

Researchers at Northeastern University have discovered how to change the electronic state of matter on demand, a breakthrough that could make electronics 1,000 times faster and more efficient.

By switching from insulating to conducting and vice versa, the discovery creates the potential to replace silicon components in electronics with exponentially smaller and faster quantum materials.

“Processors work in gigahertz right now,” said Alberto de la Torre, assistant professor of physics and lead author of the research. “The speed of change that this would enable would allow you to go to terahertz.”

Team tackles support structure bottlenecks with dual-wavelength 3D printing

Lawrence Livermore National Laboratory (LLNL) researchers have developed a novel 3D printing technique that uses light to build complex structures, then cleanly dissolves the support material, expanding possibilities in multi-material additive manufacturing (AM).

In 3D printing, traditional supports often add time, waste and risk to the process, especially when printing intricate parts. But in a new study published in ACS Central Science, an LLNL team—in collaboration with University of California, Santa Barbara (UCSB) researchers—outlines a “one-pot” printing approach that uses two light wavelengths to simultaneously create permanent structures and temporary supports from a single resin formulation.

The method addresses a longstanding challenge in AM: how to fabricate suspended or overhanging features without cumbersome scaffolding requiring manual removal, which is a key hurdle to the widespread adoption of digital light processing (DLP) 3D printing technologies.

Twisted trilayer graphene shows high kinetic inductance and quantum coherence

Superconductivity is an advantageous physical phenomenon observed in some materials, which entails an electrical resistance of zero below specific critical temperatures. This phenomenon is known to arise following the formation of so-called Cooper pairs (i.e., pairs of electrons).

There are two known types of superconductivity, known as conventional and unconventional superconductivity. In , the formation of Cooper pairs is mediated by the interaction between electrons and phonons (i.e., vibrations in a crystal’s lattice), as explained by Bardeen-Cooper-Schrieffer (BCS) theory.

Unconventional superconductors, on the other hand, are materials that exhibit a superconductivity that is not prompted by electron–phonon interactions. While many past studies have tried to shed light on the mechanisms underpinning unconventional superconductivity, its underlying physics remains poorly understood.