Scientists have discovered a new class of materials: higher-order topological insulators. Theoretical physicists first predicted the existence of these insulators with conducting properties on the edges of crystals rather than on their surface and their characteristic ability to conduct electricity without dissipation. Now, these novel properties are demonstrated experimentally in bismuth.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2018/09/180912095032.htm
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