Correction to: Nature Nanotechnology https://doi.org/10.1038/s41565-020-00780-5, published online 12 October 2020.

In the version of this News & Views article originally published online, ref. 7 “Reed, A. M. et al. Nat. Nanotechnol. https://doi.org/10.1038/s41565-020-00780-5 (2020).” was incorrect; it should have been “Zhang, K. et al. Nat. Nanotechnol. https://doi.org/10.1038/s41565-020-00778-z (2020).” This has now been corrected in all versions of the News & Views article.