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  Graphene; insulator or superconductor?
 
  When rotated at a "magic angle," graphene sheets can form an insulator or a superconductor.

The physicists accomplished this by creating a “superlattice” of two graphene sheets stacked together — not precisely on top of each other, but rotated ever so slightly, at a “magic angle” of 1.1 degrees. As a result, the overlaying, hexagonal honeycomb pattern is offset slightly, creating a precise moiré configuration that is predicted to induce strange, “strongly correlated interactions” between the electrons in the graphene sheets. In any other stacked configuration, graphene prefers to remain distinct, interacting very little, electronically or otherwise, with its neighboring layers.

For more, check out this MIT story.

 
      Posted by: Agitator!!, March 12, 2018, 11:50 am  

 
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