Correction to: Nature Physics https://doi.org/10.1038/s41567-019-0630-5, published online 19 August 2019.

In the version of this Article originally published, in the Acknowledgements the sentence “L.F. and G.D.G are supported by US DOE (DE-SC0010526 and DE-SC0012704, respectively).” was incorrect and should have read “The work at MIT is supported by DOE Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under award no. DE-SC0019275. G.D.G. is supported by US DOE DE-SC0012704.” This has now been corrected in the online versions of the Article.