Surface State Bands in Superconducting (PtxIr1?x)Te2
KONG Wan-Dong1, MIAO Hu1, QIAN Tian1**, WANG Zhi-Jun1, XU Gang1, FANG Ai-Fang1, HUANG Yao-Bo1, ZHANG Peng1, SHI Xun1, FANG Zhong1,2, DAI Xi1,2, RICHARD Pierre1,2, WANG Nan-Lin1,2,3, DING Hong1,2**
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2Collaborative Innovation Center of Quantum Matter, Beijing 100871 3International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871
Abstract：Angle-resolved photoemission spectroscopy is performed to study the bulk and surface electronic structures of non-superconducting IrTe2 and superconducting Pt0.05Ir0.95Te2. In addition to the bulk electronic bands predicted by the local density approximation calculations, we observe two Dirac cone-like bands at the Brillouin zone center, which are non-dispersive along kz, suggesting that the extra bands are surface state bands. As the experimental results are well consistent with the ab initio calculations of surface states, the parity analysis proves that these surface state bands are topologically trivial and thus exclude (PtxIr1?x)Te2 as a possible topological superconductor candidate.
2015, Vol. 32 
