gallium arsenide tagged posts

Quantum materials emit light as though it were only a positive pulse, rather than a positive-negative oscillation. A laser pulse that sidesteps the inherent symmetry of light waves could manipulate quantum information, potentially bringing us closer to room temperature quantum computing.

The study, led by researchers at the University of Regensburg and the University of Michigan, could also accelerate conventional computing.

Quantum computing has the potential to accelerate solutions to problems ...

A method created at Rice University closes the gap between light and matter and may help advance technologies like quantum computers and communications. The lab designed and built a high-quality cavity to contain an ultrathin layer of gallium arsenide. By tuning the material with a magnetic field to resonate with a certain state of light in the cavity, they prompted the formation of polaritons that act in a collective manner. Credit: Qi Zhang/Rice University

Physicists probe photon-electron interactions in vacuum cavity experiments. Rice physicists are closing in on a way to create a new condensed matter state in which all the electrons in a material act as one by manipulating them with light and a magnetic field...

This is Tim Burgess with a silicon wafer on which nanostructures are grown. Credit: Stuart Hay, ANU

This will help in development of low-cost biomedical sensors, quantum computing, and a faster internet. Researcher Tim Burgess added atoms of zinc to lasers 1/100 the diameter of a human hair and made of gallium arsenide – a material used extensively in smartphones and other electronic devices. The impurities led to a 100X improvement in the amount of light from the lasers.

“Normally you wouldn’t even bother looking for light from nanocrystals of gallium arsenide – we were initially adding zinc simply to improve the electrical conductivity,” said Mr Burgess, a PhD student, ANU. “It was only when I happened to check for light emission that I realised we were onto something.”

Gallium arsenide ...