1. Department of Electrical and Electronics Engineering, Bogazici University, Istanbul 34342, Turkey
2. Department of Nanoscience and Nanoengineering, Istanbul Technical University, Istanbul 34469, Turkey
3. Department of Metallurgical and Materials Engineering, Istanbul Technical University, Istanbul 34469, Turkey
4. Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle-upon-Tyne NE18ST, United Kingdom