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Topological insulators have a bandgap in their bulk, which means that transport can only occur through topologically protected edge states. These states are robust to disorder when it’s
weak, but for sufficiently strong disorder, all the bandgaps are closed, meaning topological features should be destroyed. The prediction that non-trivial topology can emerge from a trivial
band structure with the addition of disorder therefore came as something of a surprise. Now, Eric Meier and co-workers have verified the prediction by observing such a phase.
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