Physics

NASA 'Inspired Science' Challenge Winners Talk Live With Astronaut

NASA astronaut Don Pettit will conduct three live video chats Thursday, April 25, with 12 student teams whose science experiments won an agency-sponsored contest.

New material approach should increase solar cell efficiency

A new research group brought together aspects of condensed matter physics, semiconductor device engineering, and photochemistry to develop a new form of high-performance solar photocatalyst based on the combination of the TiO2 (titanium dioxide) and other "metallic" oxides that greatly enhance the visible light absorption and promote more efficient utilization of the solar spectrum for energy applications.

Nanowires grown on graphene have surprising structure

When engineers set out to grow nanowires of a compound semiconductor on top of a sheet of graphene, they did not expect to discover a new paradigm of epitaxy. The self-assembled wires have a core of one composition and an outer layer of another, a desired trait for many advanced electronics applications.

The crystal's corners: New nanowire structure has potential to increase semiconductor applications

New research describes the discovery of a new structure that is a fundamental game changer in the physics of semiconductor nanowires.

Light bursts out of a flying mirror

Researchers have succeeded in generating flashes of extreme ultraviolet radiation via the reflection from a mirror that moves close to the speed of light.

Cause of LED efficiency droop finally revealed: Auger recombination responsible

(Phys.org)—Researchers at University of California, Santa Barbara, in collaboration with colleagues at the École Polytechnique in France, have conclusively identified Auger recombination as the mechanism that causes light emitting diodes (LEDs) to be less efficient at high drive currents.

Physicist explains how new results from an underground experiment add intrigue to the hunt for dark matter

Physicists operating an underground experiment in Minnesota reported last week that they have found possible hints of dark matter. The Cryogenic Dark Matter Search (CDMS) experiment detected three events with the characteristics expected of dark matter, Kevin McCarthy, a PhD student in physics at MIT, reported at the American Physical Society meeting in Denver.

Researchers capture wasted heat, use it to power devices

(Phys.org) —Imagine how much you could save on your electricity bill if you could use the excess heat your computer generates to actually power the machine. Researchers at the UCLA Henry Samueli School of Engineering and Applied Science have taken an important step toward harnessing that heat and converting it for practical use. The advance could lead to more energy-efficient appliances and information processing devices.

New research findings open door to zinc-oxide-based UV lasers, LED devices

Researchers have solved a long-standing materials science problem, making it possible to create new semiconductor devices using zinc oxide -- including efficient ultraviolet lasers and LED devices for use in sensors and drinking water treatment, as well as new ferromagnetic devices.

Scientists provide 'new spin' on emerging quantum technologies

Scientists have shed new light on a fundamental area of physics which could have important implications for future electronic devices and the transfer of information at the quantum level.

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