Xiaodong Xu^1,2,‡

• ¹Department of Physics, University of Washington, Seattle, Washington 98195, USA
• ²Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, USA
• ³Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
• ⁴Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
• ⁵Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

• ^*Present address: Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies (C2N), Palaiseau 91120, France.
• ^†Contact author: dixiao@uw.edu
• ^‡Contact author: xuxd@uw.edu