1. Physics Characterization and Simulations Lab (PCSL), Department of Physics, School of Natural Sciences (SNS), National University of Sciences and Technology (NUST), Islamabad 54000, Pakistan
2. Shandong Technology Center of Nanodevices and Integration, School of Microelectronics, Shandong University, Jinan 250101, China
3. Department of Material Science and Engineering, Uppsala University, 75121 Uppsala, Sweden
4. Department of Electrical Engineering, Mirpur University of Science and Technology (MUST), Mirpur 10250, Azad Jammu and Kashmir, Pakistan