1. The
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
2. School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
3. Leiden
Institute of Physics, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands
4. Institute
of Physics, National Academy of Science of Ukraine, 46, pr. Nauki, 03028 Kiev, Ukraine
5. School
of Engineering, Brown University, Providence, Rhode Island 02906, United States
6. Institute
for Problems of Materials Science, National Academy of Science of Ukraine, 3, Krjijanovskogo, 03142 Kiev, Ukraine
7. Materials
Science and Engineering Program, The University of Texas at Austin, 1
University Station, Austin, Texas 78712, United States
8. Department
of Electrical and Computer Engineering, University of California, Santa
Barbara, California 93106, United States
9. Division of Quantum Phases & Devices, Department of Physics, Konkuk University, Seoul 143-701, Korea
10. Hybrid
Materials Research Center and Department of Nanotechnology and Advanced
Materials Engineering, Sejong University, Seoul 143-747, Korea
11. Department
of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States