1. Experimental Physics LabNational Center for PhysicsQuaid‐i‐Azam UniversityIslamabad44000Pakistan
2. Center of Excellence in Solid State PhysicsUniversity of the PunjabLahorePakistan
3. UNESCO‐UNISA Africa Chair in Nanosciences/NanotechnologyCollege of Graduate StudiesUniversity of South AfricaMuckleneuk Ridge PO Box 392PretoriaSouth Africa
4. Nanosciences African Network (NANOAFNET)iThemba LABS‐National Research Foundation1 OldFaure Road, Somerset West7129PO Box 722Somerset WestWestern Cape ProvinceSouth Africa
5. Laboratory of Nanoscience and TechnologyDepartment of PhysicsInternational Islamic University IslamabadIslamabadPakistan