1. Quantum Nano-electronics
Research Center, Department of Physical Electronics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan
2. Electrical
and Computer Engineering Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
3. Sandia National Laboratories, Livermore, California 94551, United States
4. Chemistry
Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia