1. Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Kolkata, West Bengal 741246, India
2. Theoretical Biology and Biophysics Group, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
3. New Mexico Consortium, Los Alamos, New Mexico 87544, United States
4. Center for Theoretical Biological Physics, Rice University, Houston, Texas 77005, United States
5. Departments of Physics and Astronomy, Chemistry, and Biosciences, Rice University, Houston, Texas 77005, United States