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Topological insulators

A romance with many dimensions

Electric charges on the boundaries of certain insulators are programmed by topology to keep moving forward when they encounter an obstacle, rather than scattering backwards and increasing the resistance of the system. This is just one reason why topological insulators are one of the hottest topics in physics right now.

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Figure 1: Different dimensions.
Figure 2: Topological insulators and band structures.
Figure 3: Inside a topological insulator.

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Manoharan, H. A romance with many dimensions. Nature Nanotech 5, 477–479 (2010). https://doi.org/10.1038/nnano.2010.138

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