Phys. Rev. Lett. 97 , 146101 (2006)
Erdong Lu, David C. Ingram, Arthur R. Smith
Nanoscale & Quantum Phenomena Institute, Department of Physics & Astronomy, Ohio University, Athens, OH 45701
J. W. Knepper, and F. Y. Yang
Department of Physics, The Ohio State University, 191 Woodruff Avenue, Columbus, OH 43210
Copyright 2006 The American Physical Society
Link to Article on PRL website
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(online October 2nd, 2006)