1. Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. Department of Physics, University of California Berkeley, Berkeley, California 94720, United States
3. DEN, Service de Recherches de Métallurgie Physique, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
4. Kavli Energy Nanosciences Institute at Berkeley, Berkeley, California 94720, United States