Clocking the onset of bilayer coherence in a high-Tc cuprate

Edoardo Baldini,1,2 Andreas Mann,1 Benjamin P. P. Mallett,3 Christopher Arrell,2 Frank van Mourik,2 Thomas Wolf,4 Dragan Mihailovic,5 Jeffrey L. Tallon,6 Christian Bernhard,3 José Lorenzana,7 and Fabrizio Carbone1 1Laboratory for Ultrafast Microscopy and Electron Scattering, IPHYS, EPFL, CH-1015 Lausanne, Switzerland 2Laboratory of Ultrafast Spectroscopy, ISIC, EPFL, CH-1015 Lausanne, Switzerland 3Department of Physics, University of Fribourg, Chemin du Musée 3, CH-1700 Fribourg, Switzerland 4Institute of Solid State Physics, Karlsruhe Institute of Technology, Postfach 3640, Karlsruhe 76021, Germany 5Jozef Stefan Institute and International Postgraduate School, Jamova 39, SI-1000 Ljubljana, Slovenia 6Robinson Research Institute, Victoria University of Wellington, P.O. Box 33436 Lower Hutt, New Zealand 7Institute for Complex Systems CNR, and Physics Department, University of Rome “La Sapienza”, I-00185 Rome, Italy (Received 6 September 2016; published 3 January 2017)