1. Materials Department, University of California−Santa Barbara, Santa Barbara, California 93106, United States
2. Department of Electronic and Computer Engineering, University of California−Santa Barbara, Santa Barbara, California 93106, United States
3. Intel Corp., Santa Clara, California 95054, United States
4. Department of Material Science and Engineering, Stanford University, Stanford, California 94305, United States
5. LTCI, Télécom Paris, Institut Polytechnique de Paris, 19 Place Marguerite Perey, 91120 Palaiseau, France
6. Center for High Technology Materials, University of New Mexico, Albuquerque, New Mexico 87106, United States
7. Sandia National Laboratories, Albuquerque, New Mexico 87185-1086, United States