1. Department
of Materials Science
and Engineering, University of California, Los Angeles, Los Angeles, California 90024, United States
2. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico
87545, United States
3. Center
for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico
87123, United States
4. Department
of Theoretical Physics, Cherkasy National University, Cherkasy, Ukraine
5. Department
of Electrical and
Computer Engineering, University of California San Diego, La Jolla, California 92093, United States