A University of Oklahoma physics group sheds light on a novel Mott state observed in twisted graphene bilayers at the 'magic angle' in a recent study just published in Physical Review Letters. OU physicists show the Mott state in graphene bilayers favors ferromagnetic alignment of the electron spins, a phenomenon unheard of in conventional Mott insulators, and a new concept on the novel insulating state observed in twisted graphene bilayers.
Researchers at the University of Maryland have captured the most direct evidence to date of Klein tunneling, a quantum quirk that allows particles to tunnel through a barrier like it's not even there. The result may enable engineers to design more uniform components for future quantum computers, quantum sensors and other devices.
A groundbreaking research effort involving scientists at NREL; Lawrence Berkeley National Laboratory (LBNL); University of Colorado, Boulder (CU); and other partner institutions around the country recently published 'A Map of the Inorganic Ternary Metal Nitrides,' which appears in Nature Materials.
Osaka University researchers studied the photocatalytic activity of oxyhalide materials and were able to demonstrate a relationship between parameters measured by time-resolved microwave conductivity (TRMC) and oxygen generation. Using the relationship, they optimized the processing temperature for the synthesis of the photocatalyst PbBiO2Cl, resulting in a 3-fold improvement in the apparent quantum efficiency compared with previous reports. It is hoped that the findings will allow for high throughput screening and efficient photocatalyst development.
Ferroelectric FET (FeFET) is a promising memory device because of its low-power, high-speed and high-capacity. Toward 3D integration for higher capacity, a team of researchers developed a ferroelectric-HfO2 based FeFET with 8nm-thick IGZO channel instead of poly-silicon channel. They achieved nearly ideal subthreshold swing of 60mV/dec and higher mobility than poly-silicon channel thanks to the material property of IGZO and junctionless transistor operation. The obtained results will contribute to ultralow power devices for IoT applications.
Indium-gallium-zinc oxide ceramics are used as the backplane for flat-panel displays, this was made possible through substantial synergistic contributions coming from the powerhouse that is Japan. A team of researchers from Japan reports the synthesis of centimeter-scale single crystals of a particular type of these semiconductors, InGaZnO4 (IGZO-11), with attractive characteristics such as wide band gap and high electrical mobility and conductivity, which make it promising candidates for transparent optoelectronic devices like touchable displays and organic LEDs.
From Berkeley Lab: groundbreaking study maps out paths to new nitride materials; new framework for artificial photosynthesis; TMDCs don't have to be perfect to shine bright.
Decay is relentless in the macroscopic world: broken objects do not fit themselves back together again. However, other laws are valid in the quantum world: new research shows that so-called quasiparticles can decay and reorganize themselves again and are thus become virtually immortal. These are good prospects for the development of durable data memories.
Scientists seeking to understand the mechanism underlying superconductivity in 'stripe-ordered' cuprates -- copper-oxide materials with alternating areas of electric charge and magnetism -- discovered an unusual metallic state when attempting to turn superconductivity off. They found that under the conditions of their experiment, even after the material loses its ability to carry electrical current with no energy loss, it retains some conductivity -- and possibly the electron (or hole) pairs required for its superconducting superpower.
Researchers from Jülich in cooperation with partners from other institutions has developed a new method to measure the electric potentials of a sample at atomic accuracy. Using conventional methods, it was virtually impossible until now to quantitatively record the electric potentials that occur in the immediate vicinity of individual molecules or atoms. The new scanning quantum dot microscopy method could open up new opportunities for chip manufacture or the characterization of biomolecules such as DNA.