Kumar Ghosh

Magnetic materials can sometimes behave like a group of people who just can't agree: some bonds between atoms pull one way, others the opposite. When such conflicts pile up, the system becomes 'frustrated'—it can't settle into a single state of rest.

In a superconductor, where electrons move in pairs without resistance, special waves can run along the edges, like ripples along the edge of a carpet. The number of such waves is an important characteristic of the material, but measuring it directly is difficult.