1. Center for Theoretical Biological Physics, Rice University, Houston, Texas 77005, United States
2. Department of Chemistry, Rice University, Houston, Texas 77005, United States
3. Department of Mathematics and Computer Science, Freie Universität Berlin, Arnimallee 6, 14195 Berlin, Germany
4. Computational Science Laboratory, Universitat Pompeu Fabra, PRBB, C/Dr Aiguader 88, 08003 Barcelona, Spain
5. Department of Physics, Rice University, Houston, Texas 77005, United States
6. Institucio Catalana de Recerca i Estudis Avanats (ICREA), Passeig Lluis Companys 23, 08010 Barcelona, Spain