Physicists discovered in 2013 the world's first naturally occurring topological insulator, which can be mined from the earth's crust.
Sources
- Physicists Discover World's First Naturally Occurring Topological Insulator (technologyreview.com)
- https://pubmed.ncbi.nlm.nih.gov/23438015/ (pubmed.ncbi.nlm.nih.gov)
- https://pubs.acs.org/doi/abs/10.1021/nl304583m (pubs.acs.org)
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