By taking two flakes of special materials that are just one atom thick and twisting them at high angles, researchers at the University of Rochester have unlocked unique optical properties that could be used in quantum computers and other quantum technologies.
Posted in nanotechnology, nuclear energy, particle physics, space | Leave a Comment on Nanomaterials used to measure first nuclear reaction on radioactive nuclei produced in neutron star collisions
Physicists have measured a nuclear reaction that can occur in neutron star collisions, providing direct experimental data for a process that had previously only been theorized. The study, led by the University of Surrey, provides new insight into how the universe’s heaviest elements are forged—and could even drive advancements in nuclear reactor physics.
Working in collaboration with the University of York, the University of Seville, and TRIUMF, Canada’s national particle accelerator center, the breakthrough marks the first-ever measurement of a weak r-process reaction cross-section using a radioactive ion beam, in this case studying the 94 Sr(α, n)97 Zr reaction. This is where a radioactive form of strontium (strontium-94) absorbs an alpha particle (a helium nucleus), then emits a neutron and transforms into zirconium-97.
The study has been published in Physical Review Letters.
Amplified spontaneous emission is a physical phenomenon that entails the amplification of the light spontaneously emitted by excited particles, due to photons of the same frequency triggering further emissions. This phenomenon is central to the functioning of various optoelectronic technologies, including lasers and optical amplifiers (i.e., devices designed to boost the intensity of light).
The excitation of a material with high-energy photons can produce what is known as an electron-hole plasma. This state is characterized by the dense presence of negatively charged particles (i.e., electrons) and positively charged vacancies (i.e., holes).
Researchers at Wuhan University recently observed amplified spontaneous emission originating from degenerate electron-hole plasma in a 2D semiconductor, namely suspended bilayer tungsten disulfide (WS2). Their paper, published in Physical Review Letters, could pave the way for the development of new optoelectronic technologies based on 2D semiconductors.
New theoretical physics research introduces a simulation method of machine-learning-based effective Hamiltonian for super-large-scale atomic structures. This effective Hamiltonian method could simulate much larger structures than the methods based on quantum mechanisms and classical mechanics.
The findings are published in npj Computational Materials under the title, “Active learning of effective Hamiltonian for super-large-scale atomic structures.” The paper was authored by an international team of physicists, including the University of Arkansas, Nanjing University, and the University of Luxembourg.
In ferroelectrics and dielectrics, there is one kind of structure—mesoscopic structure, which usually has atoms more than millions.
The heliosphere, a cosmic bubble formed by the Sun, protects our solar system from interstellar threats and influences life’s evolution. Despite its vital role, its true shape remains a puzzle, with data from Voyager missions hinting at its complexities. Upcoming interstellar probes aim to uncover more about this mysterious region.
The Sun does more than just warm the Earth, making it habitable for people and animals. It also shapes a vast region of space. This region, known as the heliosphere, extends more than a hundred times the distance between the Sun and Earth, influencing everything within it.
As a star, the Sun constantly emits a flow of charged particles called the solar wind, a stream of energized plasma.
A research team led by Prof. Zhengtian Lu and Researcher Tian Xia from the University of Science and Technology of China (USTC) has successfully created a quantum state with a lifetime on the scale of minutes using optically trapped cold atoms. This breakthrough significantly improves the sensitivity of quantum metrology measurements. Their findings were published in Nature Photonics
<em> Nature Photonics </em> is a prestigious, peer-reviewed scientific journal that is published by the Nature Publishing Group. Launched in January 2007, the journal focuses on the field of photonics, which includes research into the science and technology of light generation, manipulation, and detection. Its content ranges from fundamental research to applied science, covering topics such as lasers, optical devices, photonics materials, and photonics for energy. In addition to research papers, <em> Nature Photonics </em> also publishes reviews, news, and commentary on significant developments in the photonics field. It is a highly respected publication and is widely read by researchers, academics, and professionals in the photonics and related fields.
Posted in engineering, nanotechnology, particle physics, solar power, sustainability | Leave a Comment on Scientists unlock new dimension in light manipulation, ushering in a new era in photonic technology
Researchers at Heriot-Watt University have made a discovery that could pave the way for a transformative era in photonic technology. For decades, scientists have theorized the possibility of manipulating the optical properties of light by adding a new dimension—time. This once-elusive concept has now become a reality thanks to nanophotonics experts from the School of Engineering and Physical Sciences in Edinburgh, Scotland.
Published in Nature Photonics, the team’s breakthrough emerged from experiments with nanomaterials known as transparent conducting oxides (TCOs)—a special glass capable of changing how light moves through the material at incredible speeds. These compounds are widely found in solar panels and touchscreens and can be shaped as ultra-thin films measuring just 250 nanometers (0.00025 mm), smaller than the wavelength of visible light.
Led by Dr. Marcello Ferrera, Associate Professor of Nanophotonics, of the Heriot-Watt research team, supported by colleagues from Purdue University in the US, managed to “sculpt” the way TCOs react by radiating the material with ultra-fast pulses of light. Remarkably, the resulting temporally engineered layer was able to simultaneously control the direction and energy of individual particles of light, known as photons, a functionality which, up until now, had been unachievable.
For decades, atomic clocks have been the pinnacle of precision timekeeping, enabling GPS navigation, cutting-edge physics research, and tests of fundamental theories. But researchers at JILA, led by JILA and NIST Fellow and University of Colorado Boulder physics professor Jun Ye, in collaboration with the Technical University of Vienna, are pushing beyond atomic transitions to something potentially even more stable: a nuclear clock.
This clock could revolutionize timekeeping by using a uniquely low-energy transition within the nucleus of a thorium-229 atom. This transition is less sensitive to environmental disturbances than modern atomic clocks and has been proposed for tests of fundamental physics beyond the Standard Model.
This idea isn’t new in Ye’s laboratory. In fact, work in the lab on nuclear clocks began with a landmark experiment, the results of which were published as a cover article of Nature last year, where the team made the first frequency-based, quantum-state-resolved measurement of the thorium-229 nuclear transition in a thorium-doped host crystal. This achievement confirmed that thorium’s nuclear transition could be measured with enough precision to be used as a timekeeping reference.
The use of artificial intelligence (AI) scares many people as neural networks, modeled after the human brain, are so complex that even experts do not understand them. However, the risk to society of applying opaque algorithms varies depending on the application.
While AI can cause great damage in democratic elections through the manipulation of social media, in astrophysics it at worst leads to an incorrect view of the cosmos, says Dr. Jonas Glombitza from the Erlangen Center for Astroparticle Physics (ECAP) at Friedrich-Alexander Universität Erlangen-Nürnberg (FAU).
The astrophysicist uses AI to accelerate the analysis of data from an observatory that researches cosmic radiation.
The race toward scalable quantum computing has reached a pivotal moment, with major players like Microsoft, Google, and IBM pushing forward with breakthroughs. Microsoft’s recent announcement of its Majorana 1 chip marks a significant milestone, while Google’s Willow chip and IBM’s long-term quantum roadmap illustrate the industry’s diverse approaches to achieving fault-tolerant quantum systems. As the quantum computing industry debates the timeline for practical implementation, breakthroughs like Majorana 1 and Willow suggest that major advancements may be closer than previously thought. At the same time, skepticism remains, with industry leaders such as Nvidia CEO Jensen Huang cautioning that meaningful commercial quantum applications could still be decades away.
Microsoft is redefining quantum computing with its new Majorana 1 chip, a significant breakthrough in the pursuit of scalable and fault-tolerant quantum systems. This quantum processor is built on a novel topological architecture that integrates Majorana particles, exotic quantum states that enhance qubit stability and reduce errors. Unlike conventional qubit technologies, which require extensive error correction, Microsoft’s approach aims to build fault tolerance directly into the hardware, significantly improving the feasibility of large-scale quantum computing. Satya Nadella, Microsoft’s CEO, highlighted the significance of this milestone in his LinkedIn post, We’ve created an entirely new state of matter, powered by a new class of materials, topoconductors. This fundamental leap in computing enables the first quantum processing unit built on a topological core.