1. Bremen
Center for Computational Materials Science, University of Bremen, Am Falturm 1, 28359 Bremen, Germany
2. Engineering
and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany
3. Department
of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, United States;
4. Department
of Physics, University of Minnesota, 116 Church St., SE, Minneapolis, Minnesota 55416, United States