Laser emission demonstrated at room temperature: semiconductors consisting of three atomic layers could form the basis for innovative lasers. An international team of researchers led by physicists from the University of Oldenburg presented their findings in the journal Nature Communications. In an article published in the scientific journal Nature Communications, an international team led by Oldenburg physicists Dr. Hangyon Shan, Prof. Dr Christian Schneider and Dr. Carlos Anton-Solanas reports that crystals consisting of just three atomic layers can emit laser-like…
NGC 2438 is a planetary nebula, formed after the death of a Sun-like star. The medium-sized star would have expelled its outer layers of gas into space as it died, leaving behind a white-dwarf core. A halo of glowing gas over 4.5 light-years across surrounds the nebula’s brighter inner ring. Many round or nearly round planetary nebulae display these halo structures, and astronomers have been investigating how they evolve. NGC 2438 was one of the nebulae studied, and researchers found…
Scientists experimentally reconstruct Bloch wavefunction for the first time. Lightspeed is the fastest velocity in the universe. Except when it isn’t. Anyone who’s seen a prism split white light into a rainbow has witnessed how material properties can influence the behavior of quantum objects: in this case, the speed at which light propagates. Electrons also behave differently in materials than they do in free space, and understanding how is critical for scientists studying material properties and engineers looking to develop…
Theorists at The University of Texas at Dallas, along with colleagues in Germany, have for the first time observed a rare phenomenon called the quantum anomalous Hall effect in a very simple material. Previous experiments have detected it only in complex or delicate materials. Dr. Fan Zhang, associate professor of physics in the School of Natural Sciences and Mathematics, is an author of a study published on Oct. 6 in the journal Nature that demonstrates the exotic behavior in bilayer graphene, which is a naturally…
…top ranked by Decadal Survey. The 2020 Decadal Survey for Astronomy and Astrophysics has recommended a new series of three Great Observatories — or space-based telescopes — as a top national priority for the future of space astrophysics. The Lynx X-Ray Observatory is included as part of this vision. Dozens of scientists and engineers at the Center for Astrophysics | Harvard & Smithsonian teamed with colleagues around the world to define the observatory’s scientific objectives, conceptualize its design and work on key technologies. Known as the Decadal…
Computer modelling explains black hole observations. Further confirmation of Einstein’s theory of general relativity. The galaxy Messier 87 (M87) is located 55 million light years away from Earth in the Virgo constellation. It is a giant galaxy with 12,000 globular clusters, making the Milky Way’s 200 globular clusters appear modest in comparison. A black hole of six and a half billion sun masses is harboured at the centre of M87. It is the first black hole for which an image…
NRAO project ranked as important new initiative. The Astronomy and Astrophysics Decadal Survey (Astro2020) of the U.S. National Academy of Sciences has published its report and the Next Generation Very Large Array (ngVLA) received high priority for new ground-based observatories to be constructed during the coming decade. The report, in which ngVLA shared second ranking among ground-based projects, was the culmination of a lengthy process aimed at developing a comprehensive research strategy and vision for a decade of transformative science…
An international research team from the Cluster of Excellence ct.qmat-Complexity and Topology in Quantum Matter has demonstrated a completely novel state of matter in a metal. It is created by the combination of four electrons-until now, only electron pairs were known. This discovery could lead to a new type of superconductivity, an entirely new research direction, and revolutionary technologies such as quantum sensors. The results have now been published in the journal Nature Physics. Dissipationless electric energy transport–also known as…
When two galaxies collide, the supermassive black holes at their cores release a devastating gravitational “kick,” similar to the recoil from a shotgun. New research led by CU Boulder suggests that this kick may be so powerful it can knock millions of stars into wonky orbits. The research, published Oct. 29 in The Astrophysical Journal Letters, helps solve a decades-old mystery surrounding a strangely-shaped cluster of stars at the heart of the Andromeda Galaxy. It might also help researchers better…
Acoustic manipulation of electron spins could lead to new methods of quantum control. The captured electrons typically absorb light in the visible spectrum, so that a transparent material becomes colored under the presence of such centers, for instance in diamond. “Color centers are often coming along with certain magnetic properties, making them promising systems for applications in quantum technologies, like quantum memories – the qubits – or quantum sensors. The challenge here is to develop efficient methods to control the…
Ultrashort flashes of light combined precisely and quickly. Ultrashort flashes of light lasting less than a quadrillionth of a second are fast growing in technological importance. In laser sources, pairs and groups of light flashes can be created instead of individual flashes. Similar to the chemically bonded atoms in a molecule, they are coupled with each other and their short temporal intervals can possess remarkable stability. Researchers at the Universities of Bayreuth and Constance have now revealed a cause for…
Leicester study of data captured in orbit around Jupiter has revealed new insights into what’s happening deep beneath the gas giant’s distinctive and colorful bands. Data from the microwave radiometer carried by NASA’s Juno spacecraft shows that Jupiter’s banded pattern extends deep below the clouds, and that the appearance of Jupiter’s belts and zones inverts near the base of the water clouds. Microwave light allows planetary scientists to gaze deep beneath Jupiter’s colourful clouds, to understand the weather and climate…
As humanity continues its exploration of the universe, the low-gravity environment of space presents unusual challenges for scientists and engineers. Researchers at the FAMU-FSU College of Engineering and the Florida State University-headquartered National High Magnetic Field Laboratory have developed a new tool to help meet that challenge — a novel design for a low-gravity simulator that promises to break new ground for future space research and habitation. Their new design for a magnetic levitation-based low-gravity simulator can create an area…
Researchers from Chalmers University of Technology, Sweden, have uncovered a striking new behavior of the ‘strange metal’ state of high temperature superconductors. The discovery represents an important piece of the puzzle for understanding these materials, and the findings have been published in the highly prestigious journal Science. Superconductivity, where an electric current is transported without any losses, holds enormous potential for green technologies. For example, if it could be made to work at high enough temperatures, it could allow for…
In a rare glimpse at such an object, astronomers discovered a structure thought to be a “protocluster” of galaxies on its way to developing into a galaxy supercluster. Even galaxies don’t like to be alone. While astronomers have known for a while that galaxies tend to congregate in groups and clusters, the process of going from formation to friend groups has remained an open question in cosmology. In a paper published in the Astronomy & Astrophysics Journal, an international team of astronomers…
Metasurface-tailored spintronic terahertz emitters allow efficient, flexible generation and manipulation of chiral terahertz waves. Terahertz radiation, between infrared and microwave radiation in the electromagnetic spectrum, possesses unique advantages for fundamental studies and practical applications. The ability to generate and manipulate broadband chiral terahertz waves is essential for applications in material imaging, terahertz sensing, and medical diagnosis. It can also open up new possibilities for nonlinear terahertz spectroscopy, as well as coherent control of chiral molecules and magnetic materials, which could…
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