1. King Abdullah University of Science and Technology (KAUST), Core Labs, Thuwal 23955-6900, Saudi Arabia.
2. Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
3. Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), KAUST Solar Center, Thuwal 23955-6900, Saudi Arabia.
4. Department of Physics, King Abdulaziz University, Jeddah 23955-6900, Saudi Arabia.
5. Institute of Materials Physics, University of Goettingen, Goettingen, Germany.
6. 4th Institute of Physics - Solids and Nanostructures, University of Goettingen, Goettingen, Germany.
7. Department of Molecular Biology, Princeton University, NJ 08544-1044, USA.