This may satisfy certain application requirements for topological

This may satisfy certain application requirements for topological heterostructures and graphene-related electronic devices. Acknowledgements This work was financially supported by projects from the Natural Science Foundation of China (Grant Nos. 11104303, 11274333, 11204339, 61136005, and 50902150), Chinese Academy of Sciences (Grant Nos. KGZD-EW-303, XDA02040000, and XDB04010500), the Open Foundation of State Key Laboratory of Functional Materials for Informatics (Grant No. SKL201309), the National High-tech R

& D Programme (Grant No. 2012AA7024034), BAY 80-6946 purchase and the National Science and Technology Major Projects of China (Grant No. 2011ZX02707). We thank the anonymous reviewers for their helpful suggestions which have improved the manuscript. References 1. Novoselov KS, Geim AK, Morozov SV, Jiang D, Zhang Y, Dubonos SV, Grigorieva IV, Firsov AA: Electric field effect in atomically thin carbon films. Science 2004, 306:666–669.CrossRef 2. Novoselov KS, Jiang D, Schedin F, Booth TJ, Khotkevich VV, Morozov SV, Geim AK: Two-dimensional atomic

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