Evidence of van Hove Singularities in Ordered Grain Boundaries of Graphene

Chuanxu Ma, Haifeng Sun, Yeliang Zhao, Bin Li, Qunxiang Li, Aidi Zhao, Xiaoping Wang, Yi Luo, Jinlong Yang, Bing Wang, and J. G. Hou Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China (Received 27 November 2013; revised manuscript received 16 March 2014; published 6 June 2014)