1. Nanotechnology Research Center (NANOTAM), Bilkent University, Ankara, Turkey
2. Department of Electrical and Electronics Engineering, Nanotechnology Research Center (NANOTAM), Bilkent University, Ankara, Turkey
3. AB-MicroNano Inc., Bilkent University, Ankara, Turkey
4. Department of Electrical andElectronics Engineering, Institute of Materials Science and Nanotechnology (UNAM), AB-MicroNano Inc., and the Department of Physics, Nanotechnology Research Center (NANOTAM), Bilkent University, Ankara, Turkey