1. The American University in Cairo, Nanotechnology Program, AUC Avenue, P.O. Box 74, New Cairo, Cairo, Egypt
2. Zewail City of Science and AUC, Center of Nanoelectronics and Devices, AUC Avenue, P.O. Box 74, New Cairo, Cairo, Egypt
3. The American University in Cairo, Nanotechnology Program, AUC Avenue, P.O. Box 74, New Cairo, Cairo, EgyptcThe American University in Cairo, Department of Physics, AUC Avenue, P.O. Box 74, New Cairo, Cairo, Egypt