1. Institute Center for Microsystems-iMicro, Department of Electrical Engineering and Computer Science (EECS), Masdar Institute of Science and Technology, Abu Dhabi, United Arab Emirates
2. Department of Electrical and Electronics Engineering, Bilkent University, 06800 Ankara, Turkey
3. UNAM-National Nanotechnology Research Center, Bilkent University, 06800 Ankara, Turkey
4. Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey
5. Department of Physics, Marmara University, 34722 Istanbul, Turkey
6. Department of Physics, Georgia State University, Atlanta, Georgia 30303, USA