1. University of Duisburg-Essen, General and Theoretical Electrical Engineering (ATE), Faculty of Engineering, Duisburg 47048, GermanybCENIDE—Center for Nanointegration Duisburg-Essen, Duisburg 47048, GermanycShiraz University, Department of Physics, Faculty of Science, Eram Square, Shiraz 71454, Iran
2. Shiraz University, Department of Physics, Faculty of Science, Eram Square, Shiraz 71454, Iran
3. University of Duisburg-Essen, General and Theoretical Electrical Engineering (ATE), Faculty of Engineering, Duisburg 47048, GermanybCENIDE—Center for Nanointegration Duisburg-Essen, Duisburg 47048, Germany