Continuous doping of a cuprate surface: new insights from in-situ ARPES

1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 2 School of Physics, University of Chinese Academy of Sciences, Beijing 100190, China 3 Institute for Advanced Study, Tsinghua University, Beijing 100084, China 4 Collaborative Innovation Center of Quantum Matter, Beijing 100190, China 5 Department of Physics, Boston College, Chestnut Hill, MA 02467, USA 6 Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA 7 CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing, 100190, China