Correction to: Nature Physics https://doi.org/10.1038/s41567-019-0606-5, published online 5 August 2019.

In the version of this Article originally published online, the funding support for J.A. from the Army Research Office was inadvertently left out of the Acknowledgements; the information has now been added to the penultimate sentence, which now ends “J.A. support from the Army Research Office under grant award W911NF-17-1-0323 and the NSF through grant DMR-1723367.” All versions of this Article have been amended.