Shi Xun, Han Zhi-Qing, Richard Pierre, Wu Xian-Xin, Peng Xi-Liang, Qian Tian, Wang Shan-Cai, Hu Jiang-Ping, Sun Yu-Jie, Ding Hong
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; Department of Physics, Beijing Key Laboratory of Opto-Electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China.
Sci Bull (Beijing). 2017 Apr 15;62(7):503-507. doi: 10.1016/j.scib.2017.03.010. Epub 2017 Mar 9.
We performed angle-resolved photoemission spectroscopy studies on a series of FeTeSe monolayer films grown on SrTiO. The superconductivity of the films is robust and rather insensitive to the variations of the band position and effective mass caused by the substitution of Se by Te. However, the band gap between the electron- and hole-like bands at the Brillouin zone center decreases towards band inversion and parity exchange, which drive the system to a nontrivial topological state predicted by theoretical calculations. Our results provide a clear experimental indication that the FeTeSe monolayer materials are high-temperature connate topological superconductors in which band topology and superconductivity are integrated intrinsically.
我们对一系列生长在SrTiO上的FeTeSe单层薄膜进行了角分辨光电子能谱研究。这些薄膜的超导性很强，并且对由Te取代Se所引起的能带位置和有效质量的变化相当不敏感。然而，在布里渊区中心，电子型和空穴型能带之间的带隙朝着能带反转和宇称交换方向减小，这驱使系统进入理论计算所预测的非平凡拓扑态。我们的结果提供了一个明确的实验迹象，表明FeTeSe单层材料是高温本征拓扑超导体，其中能带拓扑和超导性是内在结合的。
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