Hofstadter's Butterfly Discovered in Graphene

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physicist Douglas Hofstadter

The Daily Galaxy

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Science

50 Years Later, Scientists Just Found a Quantum “Butterfly” Hiding in Graphene

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Princeton University scientists have directly observed Hofstadter ’s butterfly — a fractal pattern in electron energy levels that was first predicted in 1976 but had never before been seen in a real material.

The discovery was born from a combination of precision and luck.

A slight misalignment during the sample preparation created the ideal geometry to reveal the pattern.

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