1. Ming Hsieh Department of Electrical Engineering University of Southern California Los Angeles CA 90089 USA
2. Collaboratory for Advanced Computing and Simulations University of Southern California Los Angeles CA 90089 USA
3. Department of Applied Physics Zhejiang University of Technology Hangzhou 310023 P. R. China
4. Department of Electrical Engineering and Computer Sciences Massachusetts Institute of Technology Cambridge MA 02139 USA
5. Center for Integrated Nanotechnologies Sandia National Laboratories Albuquerque NM 87185 USA