This work was carried out while the author was a visiting scientist at the Department of Physics, University of Toronto, supported by the distinguished visiting scholar program of the Chinese government and the National Natural Science Foundation of China (40175011) and the outstanding Youth Natural Science Foundation of China (40325016). The author would like to thank Prof. T. G. Shepherd for providing pleasant working conditions during his visit and many useful suggestions that, led to much improvement of the original manuscript. Drs. Lucy Campbell and Shuzhan Ren and Mr. Mark Fruman are also acknowledged for their useful discussions and assistance. The author also thanks two anonymous reviewers for useful suggestions in improving this paper.
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