1. Department of Chemistry, University of Chicago, Chicago, Illinois 60637-1454, United States
2. Computational Science Division, Argonne National Laboratory, Argonne, Illinois 60439-8643, United States
3. Laboratoire International Associé Centre National de la Recherche Scientifique et University of Illinois at Urbana−Champaign, Unité Mixte de Recherche n°7019, Université de Lorraine, B.P.
70239, 54506 Vandoeuvre-lès-Nancy cedex, France
4. Theoretical and Computational Biophysics Group, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801-2325, United States
5. Department of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801-2325, United States
6. Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois 60637-1454, United States
7. Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439-8643, United States