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Solid-state physics

U-turns strictly prohibited

According to theory, electrons on the surface of a topological insulator are not allowed to make U-turns. This notion, and some of its main consequences, has now been tested experimentally.

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Figure 1: Electron scattering from point-like and line-like defects.
Figure 2: Energy-band structure and spin orientation in normal and helical metals.

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Franz, M. U-turns strictly prohibited. Nature 466, 323–324 (2010). https://doi.org/10.1038/466323a

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