have looked closer at the Hall effect in narrow graphene devices – so-called graphene nanoribbons and nanoconstrictions. They were puzzled when they found that the quantization of the conductance was destroyed in some samples – especially because these particular samples were optimized for low edge disorder and low contamination. As it turned out, this effect had been predicted by several theoretical physicists twenty years ago, but largely ignored since no experimental evidence was ever found.

Via:: https://www.nanowerk.com/spotlight/spotid=49400.php

Perfect edges in graphene devices sabotage the Hall effect

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