1. Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, USA
2. Core Center of Excellence in Nano Imaging (CNI), University of Southern California, Los Angeles, California 90089, USA
3. National Center for Electron Microscopy (NCEM), Molecular Foundry, Lawrence Berkeley National Laboratory, California, 94720, USA
4. Department of Physics and Astronomy, University of California, Los Angeles, California, 90095, USA
5. Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA