1. Department of Electrical and Computer Engineering and Center for High Technology Materials, University of New Mexico, Albuquerque, New Mexico 87106, United States
2. Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, United States
3. Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, United States