Different forms of carbon or allotropes including graphene and diamond are among the best conductors of heat. In a recent report on Science, Yo Machida and a research team in the department of Physics and the Laboratory of Physics and Materials in Tokyo and France monitored the evolution of thermal conductivity in thin graphite. The property evolved as a function of…
Tag: graphene
Tiny graphene sheets can start or stop ice crystals growing in water
Graphene particles that seed ice formation in water only need to be 8 square nanometres to kick-start the freezing process – any smaller and they can stop ice forming Source: https://www.newscientist.com/article/2228046-tiny-graphene-sheets-can-start-or-stop-ice-crystals-growing-in-water/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home…
The Next Graphene? Shiny and Magnetic, a New Form of Pure Carbon Dazzles
sciencehabit quotes Science magazine: A “happy accident” has yielded a new, stable form of pure carbon made from cheap feedstocks, researchers say. Like diamond and graphene, two other guises of carbon, the material seems to have extraordinary physical properties. It is harder than stainless steel, about as conductive, and as reflective as a polished aluminum mirror. Perhaps most surprising, the substance…
Quantum Hall-based superconducting interference device
In a recent report published on Science Advances, Andrew Seredinski and co-workers presented a graphene-based Josephson junction with dedicated side gates fabricated from the same sheet of graphene as the junction itself. The interdisciplinary research team in the departments of physics, astronomy and advanced materials in the U.S. and Japan found the side gates to be highly efficient, allowing them to…
Graphene sets the stage for the next generation of THz astronomy detectors
Researchers from Chalmers University of Technology have demonstrated a detector made from graphene that could revolutionize the sensors used in next-generation space telescopes. The findings were recently published in the scientific journal Nature Astronomy. Source: https://phys.org/news/2019-09-graphene-stage-thz-astronomy-detectors.html…
Stacked graphene layers act as a mirror for electron beams
Stacked layers of graphene can act like a mirror for beams of electrons. Physicists Daniël Geelen and colleagues discovered this using a new type of electron microscope. In an article in Physical Review Letters, they describe their results, which could lead to the development of optics for electron beams instead of light. …
Graphene inventor Andre Geim: No-deal Brexit would destroy UK science
Fanatics who want no-deal Brexit and remainers who refuse to compromise are risking science and the UK’s future in the process, says Nobel prizewinning physicist Andre Geim Source: https://www.newscientist.com/article/2213319-graphene-inventor-andre-geim-no-deal-brexit-would-destroy-uk-science/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home…
Unconventional phenomena triggered by acoustic waves in 2-D materials
Researchers at the Center for Theoretical Physics of Complex Systems (PCS), within the Institute for Basic Science (IBS, South Korea), and colleagues have reported a novel phenomenon, called Valley Acoustoelectric Effect, which takes place in 2-D materials, similar to graphene. This research is published in Physical Review Letters and brings new insights to the study of valleytronics. …
Utrafast magnetism: Electron-phonon interactions examined at BESSY II
How fast can a magnet switch its orientation, and what are the microscopic mechanisms at play? An HZB team at BESSY II has, for the first time, experimentally assessed the principal microscopic process of ultra-fast magnetism. The methodology developed for this purpose can also be used to investigate interactions between spins and lattice oscillations in graphene, superconductors or other quantum materials….
Research reveals exotic quantum states in double-layer graphene
Researchers from Brown and Columbia Universities have demonstrated previously unknown states of matter that arise in double-layer stacks of graphene, a two-dimensional nanomaterial. These new states, known as the fractional quantum Hall effect, arise from the complex interactions of electrons both within and across graphene layers. …