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