1 School of Physics, Ultrafast Electron Microscopy Laboratory, Nankai University, Tianjin, 300071, China. [email protected].
2 Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory, Upton, NY, 11973, USA. [email protected].
3 Institute of Physics, Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES), École Polytechnique Fédérale de Lausanne, Station 6, Lausanne, 1015, Switzerland.
4 Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211, Geneva 4, Switzerland.
5 Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA.
6 Department of Materials Science, University of Milano-Bicocca, Via Cozzi 55, 20121, Milano, Italy.
7 Institute of Physics, Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES), École Polytechnique Fédérale de Lausanne, Station 6, Lausanne, 1015, Switzerland. [email protected].
8 Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory, Upton, NY, 11973, USA. [email protected].