P. E. Dolgirev⁴, E. Demler⁵, M. H. Michael¹, and A. Cavalleri^1,6

• ¹Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
• ²Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
• ³Department of Physics, Columbia University, New York, New York 10027, USA
• ⁴Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
• ⁵Institute for Theoretical Physics, ETH Zurich, 8093 Zurich, Switzerland
• ⁶Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom

• ^*Contact author: daniele.nicoletti@mpsd.mpg.de