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Topological

Quantum Anomalous Hall Insulators

The discovery of the quantum hall effect has proven that topology is an imperative element of the quantum description of condensed matter systems. The last decade has seen the discovery of topological insulators, materials that insulate in bulk yet feature conductive surface states. These surface states are protected by topological invariants and host spin-momentum locked electron states, which are profoundly visible in transport as the bulk of the material is highly resistive.

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