Category Physics

A team of physicists that visualized the internal nanostructure of an intact butterfly wing has discovered two physical attributes that make those structures so bright and colorful. Credit: © boule1301 / Fotolia

A team of physicists that visualized the internal nanostructure of an intact butterfly wing has discovered 2 physical attributes that make those structures so bright and colorful. “Over millions of years, butterflies have evolved sophisticated cellular mechanisms to grow brightly colored structures, normally for the purpose of camouflage as well as mating,” says A/prof Oleg Shpyrko, Physics, UC SD. “It’s been known for a century that the wings of these beautiful creatures contain what are called photonic crystals, which can reflect light of only a particular color.”

But exactly ho...

This is a Perovskite solar cell prototype. Credit: Copyright Alain Herzog / EPFL

EPFL researchers are pushing the limits of perovskite solar cell performance by exploring the best way to grow these crystals. Michael Graetzel and his team found that, by briefly reducing the pressure while fabricating perovskite crystals, they were able to achieve the highest performance ever measured for larger-size perovskite solar cells, reaching over 20% efficiency and matching the performance of conventional thin-film solar cells of similar sizes.
This is promising news for perovskite technology that is already low cost and under industrial development.

However, high performance in pervoskites does not necessarily herald the doom of silicon-based solar technology...

The Solar Impulse 2 aircraft flies over the Statue of Liberty before landing at JFK airport June 11, 2016 in New York

The Solar Impulse 2 aircraft has ended its US portion of its bid to circle the globe using only solar power. “It’s absolutely incredible,” Swiss pilot Andre Borschberg said. “It’s a dream here.” The light, slow-moving aircraft later landed at New York’s Kennedy Airport, completing the 5h flight from Lehigh Valley Airport in Pennsylvania, 1 minute ahead of schedule at 3:59 am (0759 GMT).

It was the 14th leg of an east-west journey that began March 9, 2015 in Abu Dhabi, and has taken the aircraft across Asia and the Pacific to the US. From NY the Solar Impulse team will attempt to cross the Atlantic to Europe and on to the Middle East...

NIST physicists have built a quantum simulator made of trapped beryllium ions (charged atoms) that are proven to be entangled, a quantum phenomenon linking the properties of all the particles. The spinning crystal, about 1 millimeter wide, can contain anywhere from 20 to several hundred ions. Credit: NIST

Physicists at NIST have “entangled” or linked together the properties of up to 219 beryllium ions (charged atoms) to create a quantum simulator. The simulator is designed to model and mimic complex physics phenomena in a way that is impossible with conventional machines, even supercomputers. The techniques could also help improve atomic clocks.

The new NIST system can generate quantum entanglement in about 10X as many ions as any previous simulators based on ions, a scale-up that is cruci...