Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates

Xiangang Wan, Ari Turner, Ashvin Vishwanath, Sergey Y. Savrasov National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China Department of Physics, University of California, Berkeley, CA 94720 3 Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley CA 94720. Department of Physics, University of California, Davis, One Shields Avenue, Davis, CA 95616.