1. Material, Physical and Chemical Sciences Center, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
2. Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
3. Materials Characterization and Performance Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
4. Quantum Phenomena Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
5. Materials Physics Department, Sandia National Laboratories, Livermore, California 94551, United States
6. Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States