Science Daily July 9, 2019 For quantum dots to “communicate”, they must emit light at the same wavelength. The size of a quantum dot determines this emission wavelength. Instead of making quantum dots perfectly identical to begin with, researchers at the US Naval Research Laboratory change their wavelength afterwards by shrink-wrapping them with laser-crystallized hafnium oxide, squeezing the quantum dots, which shifts their wavelength in a very controllable way. Doing this for many quantum dots in an integrated circuit, could be used for optical, rather than electrical computing. The technique could accelerate the development of quantum information technologies and brain-inspired […]
Extremely hard yet metallically conductive: Researchers develop novel material with high-tech prospects
Phys.org July 8, 2019 An international team of researchers (Germany, Russia, Sweden, USA – University of Chicago, France) has developed a route to scale up the synthesis of rhenium nitride pernitride through a reaction between rhenium and ammonium azide, in a large-volume press at 33 GPa. Although metallic bonding is typically seen incompatible with intrinsic hardness, Re2(N2)(N)2 turned to be at a threshold for super hard materials. The process can be used for the synthesis of other nitrides, in particular nitrides of transition metals, which could also have technologically important properties…read more. Open Access TECHNICAL ARTICLE
Mechanical vibration generated by electron spins
EurekAlert July 2, 2019 Researchers in Japan fabricated a micro cantilever structure made of magnetic insulator yttrium iron garnet (YIG: Y3Fe5O12). A metallic thin wire was put on the root of the cantilever as a heater. When electrical current flows in the wire, the wire works as a generator of spin current by spin Seebeck effect and the spin current propagates into the micro cantilever. By measuring the vibration of the cantilever while injecting the spin current modulated near the resonant frequency of the micro cantilever, they confirmed that only the spin current injection of appropriate spin orientation can excite […]
A New Study Just Revealed That Earth’s Core Is Actually Leaking
Science Alert July 11, 2019 By looking at very small variations in the ratio of isotopes of the element tungsten, an international team of researchers (Canada, France, USA – UC Davies, Florida State University, UT Houston, Australia) suggests that some core material does transfer into the base of these mantle plumes, and the core has been leaking this material for the past 2.5 billion years. The study gives us a tracer that can be used to investigate core-mantle interaction and the change in the internal dynamics of our planet, and which can boost our understanding of how and when the […]
On-demand control of terahertz and infrared waves
Science Daily July 9, 2019 According to a 2006 prediction it should be possible to use graphene in a magnetic field not only to absorb terahertz and infrared light on demand but also to control the direction of the circular polarization. An international team of researchers (Switzerland, UK) built a special experimental setup to concentrate the infrared and terahertz radiation on small samples of pure graphene in the magnetic field and the result of the experiment confirmed the theory from 2006. They found that if electrically charged carriers are introduced, either positive or negative, it is possible to choose which […]
Pace of Super-technology Will Define the 21st Century
Next Big Future July 8, 2019 The highest potential super-technologies are ones which will enhance intelligence and human control of the material world at molecular and other levels. The super-technologies are: Genome editing applied to cognitive enhancement and antiaging Molecular nanotechnology for nanomedicine, next level computation AI and quantum computers..read more.
Physicists’ finding could revolutionize information transmission
Phys.org July 9, 2019 An international team of researchers (USA – UC Riverside, National High Magnetic Field Laboratory, State University of Florida, Japan) has observed, characterized, and controlled dark trions in tungsten diselenide. Because a trion contains three interacting particles, controllable spin and momentum indices and a rich internal structure, it can carry much more information than a single electron. The lifetime of dark trions is more than 100 times longer than the more common bright trions. The long lifetime enables information transmission by trions over a much longer distance. They demonstrated continuous tuning from positive dark trions to negative […]
Physicists use light waves to accelerate supercurrents, enable ultrafast quantum computing
Science Daily July 1, 2019 A team of researchers in the US (Iowa State University, University of Wisconsin, University of Alabama at Birmingham) is finding new macroscopic supercurrent flowing states and developing quantum controls for switching and modulating them. Experimental data obtained from a terahertz spectroscopy instrument indicates terahertz light-wave tuning of supercurrents is a universal tool and key for pushing quantum functionalities to reach their ultimate limits in many cross-cutting disciplines, design of emergent materials properties and collective coherent oscillations for quantum engineering applications…read more. TECHNICAL ARTICLES
Researchers develop ultrafast semiconductors
Phys.org July 8, 2019 An international team of researchers (UK, UCLA) designed an ultrafast and highly sensitive ‘avalanche photodiode’ (APD) that creates less electronic ‘noise’ than its silicon rivals. They combined four different atoms requiring a new molecular beam epitaxy methodology to “grow” the compound semiconductor crystal in an atom-by-atom regime. High sensitivity avalanche photodiodes have the potential to yield a new class of high-performance receivers for applications in networking and sensing. They have applications in LIDAR, or 3-D laser mapping, used to produce high-resolution maps, with applications in geomorphology, seismology and in the control and navigation of some autonomous […]
Strange warping geometry helps to push scientific boundaries
Nanowerk July 12, 2019 Atomic interactions in everyday solids and liquids are so complex that some of these materials’ properties continue to elude physicists’ understanding, even beyond the capability of mathematics. A team of researchers in the US (Princeton University, University of Maryland) turned to geometry instead. They built an electronic array on a microchip that simulates particle interactions in a hyperbolic plane. They used superconducting circuits to create a lattice that functions as a hyperbolic space. When the researchers introduce photons into the lattice, they can answer a wide range of difficult questions by observing the photons’ interactions in […]