1. Department of Applied PhysicsKTH – Royal Institute of Technology 16440 Stockholm Sweden
2. Department of Micro and NanosystemsKTH – Royal Institute of Technology 10044 Stockholm Sweden
3. Department of Electrical and Electronic EngineeringKobe University Rokkodai, Nada Kobe 657-8501 Japan
4. Department of ChemistryKTH – Royal Institute of Technology 10044 Stockholm Sweden