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Technology update

Sep 18, 2007

Experiment finds graphene’s missing pi

Researchers in the US claim to have solved the "mystery of the missing pi", which has confounded physicists studying graphene since the material was discovered in 2004. The pi in question is related to a discrepancy between the conductance of graphene as measured in the lab and the value predicted by theory. The team measured the conductance along tiny pieces of graphene as a function of both an applied voltage and the ratio between the length and width of the sheets. The results suggest that the theory is correct – but only for very small sheets with specific shapes.

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