Correction to: Nature https://doi.org/10.1038/s41586-020-2118-yPublished online 25 March 2020.

In this Article, owing to an error during the production process, a minus symbol inadvertently appeared in the denominator of equation (2). The correct equation (2) is:

$${P}{{f}}^{2}{|}_{{\rm{\max }}}=\frac{{\left({\frac{{\rm{d}}v}{{\rm{d}}{t}}|}_{{\rm{\max }}}\right)}^{2}}{8{{\rm{\pi }}}^{2}{Z}}$$

This has been corrected online.