1. Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
2. Center for Nonlinear Studies and Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
3. Department of Physics and Center for Attosecond Science and Technology, POSTECH, 7 Pohang 37673, South Korea
4. Max Planck POSTECH/KOREA Research Initiative, Pohang 37673, South Korea
5. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States
6. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States