1. Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545,
USA
2. Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003, USA
3. Department of Physics, Sungkyunkwan University,
Suwon 16419, South Korea
4. Physical Sciences Division, Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland,
Washington 99352, USA
5. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545,
USA