Using the brightest light ever produced on Earth, University of Nebraska-Lincoln physicists have changed the way light behaves.
In the world of electronics, where the quest is always for smaller and faster units with infinite battery life, topological insulators (TI) have tantalizing potential. In a paper published today in 'Science Advances,' Jing Shi, a professor of physics and astronomy at UC Riverside and colleagues MIT and Arizona State University report they have created a TI film just 25 atoms thick that adheres to an insulating magnetic film, creating a 'heterostructure.'
EPFL researchers have found a way around what was considered a fundamental limitation of physics for over 100 years. They were able to conceive resonant systems that can store electromagnetic waves over a long period of time while maintaining a broad bandwidth. Their study, which has just been published in Science, opens up a number of doors, particularly in telecommunications.
Assistant Professor Taichi Goto at Toyohashi University of Technology elucidated the noise generation mechanism of the spin wave (SW), the wave of a magnetic moment transmitted through magnetic oxide, and established a way to suppress it. The large noise generated by SWs traveling through magnetic oxides has presented a significant obstacle to its applications. However, it became clear that noise can be suppressed by installing a thin gold film in the appropriate places.
Dating back to the first century, scientists, philosophers and reporters have noted the occasional occurrence of 'bright nights,' when an unexplained glow in the night sky lets observers see distant mountains, read a newspaper or check their watch. A new study accepted for publication in Geophysical Research Letters, a journal of the American Geophysical Union, uses satellite data to present a possible explanation for these puzzling historical phenomena.
In a new study appearing this week in The Journal of Chemical Physics, researchers demonstrate a new method to calculate excitation energies. They used a new approach based on density functional methods, which use an atom-by-atom approach to calculate electronic interactions. By analyzing a benchmark set of small molecules and oligomers, their functional produced more accurate estimates of excitation energy compared to other commonly used density functionals, while requiring less computing power.
Researchers at the Federal University of São Carlos (UFSCar) in São Paulo State, Brazil, Würzburg University in Germany, and the University of South Carolina in the United States developed a transistor that can lead to the development of new kinds of device and computer circuit in which memory units are combined with logical processing units, economizing space, time, and power consumption.
Scientists at the University of Vienna have created a new structure by encapsulating a single layer of fullerene molecules between two graphene sheets. Buckyball sandwiches combine fullerenes and graphene. This structure allows to study the dynamics of the trapped molecules down to atomic resolution using scanning transmission electron microscopy. They report observing diffusion of individual molecules confined in the two-dimensional space and even find evidence for the rotation of isolated fullerenes within the structure.
Using femtosecond visible and terahertz (THz) pulses as external perturbations, scientists at Tokyo Institute of Technology and Kyoto University's Institute for Integrated Cell-Material Sciences (iCeMS) have investigated the second harmonic generation effect in photoexcited BiCoO3. Driven by the THz pulse, this research highlights the importance of orbital excitation in the Co3+ ion and provides clues for improving the performance of nonlinear optical phenomena in nonlinear crystals on the femtosecond time scale.
The 12 articles in the special issue of Advanced Electronic Materials investigate materials and devices that are being researched for their applications in micro-electronics, opto-electronics, thermo-electricity generation, photovoltaics and quantum technologies.