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Quantized chiral edge conduction on domain walls of a magnetic topological insulator

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Science  08 Dec 2017:
Vol. 358, Issue 6368, pp. 1311-1314
DOI: 10.1126/science.aan5991

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A magnetic tip reconfigures edge states

Topological phases of matter are characterized by invariants such as Chern numbers, which determine their global properties. On the boundary of two domains with different Chern numbers, chiral edge states are expected to form. Yasuda et al. engineered such states in samples of a quantum anomalous Hall material by creating magnetic domains using the tip of a magnetic force microscope. The existence of chiral edge states along the domain walls was confirmed with electrical transport measurements. The ability to reconfigure and manipulate these states may improve spintronics.

Science, this issue p. 1311