Correction to: Nature, published online 4 January 2021

In this Article, a grant number was missing from the Acknowledgements. The sentence beginning ‘This research was supported…’ should read ‘This research was supported primarily by NSF through the Princeton University Materials Research Science and Engineering Center (DMR-1420541 and DMR-2011750) and a CAREER award to S.W. (DMR-1942942).’. The original Article has been corrected online.