1. IFW Dresden, Institute of Complex
Materials, P.O. Box 270116, D-01171 Dresden, Germany
2. IBS Center for Integrated
Nanostructure Physics, Institute for Basic Science (IBS), Daejon 305-701, Republic of Korea
3. Division
of IT Convergence Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea
4. TU Dresden, Institute of Materials
Science and the Center for Advancing Electronics Dresden (cfaed), 01062 Dresden, Germany
5. NASA Ames Research Center, Moffett Field, California 94035, United States