To be fair, that article is pre-announcement and doesn't have much detail on the actual discovery. Actual paper here: http://journals.aps.org/prl/abstract/10.1

To be fair, that article is pre-announcement and doesn't have much detail on the actual discovery. Actual paper here: http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.061102 http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116...