Simulations May Explain Nanoparticles 'Pinned' to Graphene

It was hard to understand how a graphene sheet -- a featureless, flat sheet of carbon atoms -- lying on an equally featureless iridium surface, somehow converted itself into a kind of muffin tin that formed "muffins" made from newly arrived iridium atoms. The muffins were equally spaced and of equal size.

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