RT Journal Article SR Electronic T1 Angular momentum can slow down photoemission JF Science JO Science FD American Association for the Advancement of Science SP 1239 OP 1240 DO 10.1126/science.aao3421 VO 357 IS 6357 A1 Yakovlev, Vladislav S. A1 Karpowicz, Nicholas YR 2017 UL http://science.sciencemag.org/content/357/6357/1239.abstract AB