Surface State Bands in Superconducting （PtxIr1-x）Te2

Angle-resolved photoemission spectroscopy is performed to study the bulk and surface electronic structures of non- superconducting IrTe2 and superconducting Pto.oblro.95 Te2. In addition to the bulk electronic bands predicted by the local density approximation calculations, we observe two Dirac cone...

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Published in:中国物理快报：英文版 2015 (7), p.183-186
Main Author: 孔万东 苗虎 钱天 王志俊 徐刚 房爱芳 黄耀波 张鹏 施训 方忠 戴希 芮夏岩 王楠林 丁洪
Format: Article
Language:English
Subjects:
从头计算
布里渊区
表面态
表面状态
表面电子结构
角分辨光电子能谱
超导带
近似计算
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Summary:Angle-resolved photoemission spectroscopy is performed to study the bulk and surface electronic structures of non- superconducting IrTe2 and superconducting Pto.oblro.95 Te2. 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.
ISSN:0256-307X
1741-3540