Correction to: Nature Materials https://doi.org/10.1038/s41563-020-0693-9, published online 27 May 2020.

In the version of this News & Views originally published, the two ‘Interlayer exitation’ labels in Fig. 1 were incorrect; they should have read ‘Interlayer exciton’. This has now been corrected in the online versions of this News & Views.