Quantum blockade and loop currents in graphene with topological defects

Yanyang Zhang,1,2 Jiang-Ping Hu,3 B. A. Bernevig,4 X. R. Wang,2 X. C. Xie,5,1 and W. M. Liu1 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China 2Physics Department, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China 3Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA 4Princeton Center for Theoretical Physics and Department of Physics, Jadwin Hall, Princeton University, Princeton, New Jersey 08544, USA 5Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA Received 2 July 2008; revised manuscript received 16 July 2008; published 9 October 2008