Thursday, May 5, 2011

Valleytronics one step closer to reality | e! Science News

NRL researchers take a step toward valleytronics | e! Science News:

This image shows an extended line defect in graphene.The band structure of graphene with its two valleys is shown in blue and red.

The valley degree of freedom in graphene gained attention in 2007 when it was proposed that electrons and holes could be filtered according to which valley they occupy. Unfortunately, the structures required for this and subsequent valley filters are difficult to fabricate, and as a result a valley filter has yet to be demonstrated experimentally

"Valley refers to energy depressions in the band structure, which describes the energies of electron waves allowed by the symmetry of the crystal."

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