1. Department of Chemistry, Ångström Laboratory, Division of Physical Chemistry, Uppsala University, Box 523, SE-75120 Uppsala, Sweden
2. Department of Physics, Stockholm University, AlbaNova University Center, 10691 Stockholm, Sweden
3. State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
4. Department of Physics and Astronomy, The Physics of Molecular and Condensed Matter, Uppsala University, Box
516, SE-75120 Uppsala, Sweden
5. Theory and Simulations Laboratory, HRDS, Raja Ramanna Centre for Advanced Technology, Indore 452013, India