1. Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
2. Department of Chemistry, Korea Advanced Institute of Science and Technology, 34141 Daejeon, Korea
3. Institute of Theoretical Physics and Astrophysics, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
4. Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, 80424 Kaohsiung, Taiwan
5. Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden