Posted in | Graphene

Monitored Light Diffusion for Graphene Analysis

Researchers at the U.S. Department of Energy's Lawrence Berkeley National Laboratory and the University of California, Berkeley have discovered a method to monitor quantum routes showing how light diffuses in graphene. Monitored diffusion helps scientists analyze grapheme.

Berkeley Lab's Wuantum Pathways

The team led by Feng Wang of Berkeley Lab's Materials Sciences Division observed quantum disruption in Raman diffusion, an ‘inelastic’ light diffusion. This diffusion causes either energy loss or gain. It takes place in graphene and other crystals when an inward photon stimulates an electron, creating a phonon with an energy-efficient photon. Phonons are vibrations of crystal lattice. They are called particles by quantum mechanics. Quantum particles can disturb each other. Light discharge can be monitored by monitoring the route of disturbance.

According to quantum mechanics, electrons in a material's electronic state are s called the Fermi level. All states below it are full and those above it are vacant. The states can be minimized by doping to lower the Fermi energy removing the states above it and the excitation routes. The Fermi energy of undoped grapheme is situated where its bands, looking like an upside down cone, meet the empty bands. The energy can be transported by a strong electric field.

The research paper will be published in a forthcoming issue of Nature. It is also available in the Advance Online Publication.


Joel Scanlon

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Joel Scanlon

Joel, originally from the UK, emigrated to Australia in 1995 and spent 5 years working in the mining industry as an exploration Geo-technician where he developed skills in GIS Mapping and CAD. Joel also spent a year working underground in a gold/copper mine. Upon moving to the North Coast of NSW, Australia Joel worked as a graphic designer for a leading consultancy firm before starting a successful business providing graphic and web design services to local businesses on the eastern seaboard of Australia. Joel is skilled in project management, web programming, design, animation, database and networking, software and editing. Joel has been with AZoNetwork since its inception in 2000.


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