1. Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
2. Departments of Electrical Engineering and Chemistry, University of South California, 3710 McClintock Avenue, Los Angeles, California 90089, United States
3. Cherry L. Emerson Centre for Scientific Computation, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
4. Core Center of Excellence in Nano Imaging (CNI), University of South California, 814 Bloom Walk, Los Angeles, California 90089, United States