Matter wave sidebands from a complex potential with temporal helicity Bernet, S. ; Abfalterer, R. ; Keller, C. ; Schmiedmayer, J. ; Zeilinger, A. Abstract Publication: Proceedings of the Royal Society of London Series A Pub Date: April 1999 DOI: 10.1098/rspa.1999.0370 Bibcode: 1999RSPSA.455.1509B