Quantum scars make their mark in graphene

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Imagine a ball bouncing off the sides of a stadium-shaped billiard table. Regardless of where the ball starts, its trajectory will eventually cover the whole table, and it will do so in a seemingly irregular manner — in sharp contrast to the way in which a planet orbits a star, for example. This unpredictability is a hallmark of chaos, but if the ball is actually a quantum-mechanical particle, its chaotic behaviour manifests in the appearance of curious states that were predicted four decades ago1. These ‘quantum scars’ have now been visualized directly in a solid-state system, which Ge et al.2 report on in Nature.

Read the paper: Direct visualization of relativistic quantum scars in graphene quantum dots

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