1. Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
2. Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
3. Department of Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany
4. Université Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France
5. Bremen Center for Computational Materials Science, Universität Bremen, Am Fallturm, 28359 Bremen, Germany
6. Department of Physics, Duke University, Durham, North Carolina 27708, USA
7. Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China