In the version of the News & Views article 'Valleytronics: Electrons dance in diamond' originally published (Nature Mater. 12, 690–691; 2013) short excerpts have been duplicated without proper attribution from a published article (K. Behnia, Nature Nanotech. 7, 488–489; 2012). The author apologizes for the confusion caused. Corrected after print 30 October 2013.