Correction to: Nature Physics https://doi.org/10.1038/s41567-020-01104-z, published online 4 January 2021.

In the version of this Article originally published online, the ‘Equally contributing’ statement was missing, and should have read “These authors contributed equally: Wujun Shi, Benjamin J. Wieder, Holger L. Meyerheim.”; this has now been added to all versions of the Article.