Correction to: Nature https://doi.org/10.1038/s41586-019-1713-2Published online 6 November 2019

In the HTML version (the PDF and print versions were correct) of this Article, owing to a typesetting error, Tian-Yun Huang should not have been affiliated with the Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, Villigen, Switzerland (affiliation 2). This error has been corrected online.