Kangkang Wang, 1 Noboru Takeuchi, 1,2 Abhijit V. Chinchore, 1 Wenzhi Lin, 1 Yinghao Liu, 1 and Arthur R. Smith 1
1 Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, OH 45701, USA
2 Centro de Nanociencias y Nanotecnologia, Universidad Nacional Autonoma de Mexico, Apartado Postal 14, Ensenada Baja California, Codigo Postal 22800, Mexico
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