Optical study on topological superconductor candidate Sr-doped Bi_(2)Se_(3)

作     者：Jialun Liu Chennan Wang Tong Lin Liye Cao Lei Wang Jiaji Li Zhen Tao Nan Shen Rina Wu Aifang Fang Nanlin Wang Rongyan Chen 刘佳伦;王晨南;林桐;曹立叶;王蕾;李佳吉;陶镇;申娜;乌日娜;房爱芳;王楠林;陈荣艳

作者机构：Center for Advanced Quantum Studies and Department of PhysicsBeijing Normal UniversityBeijing 100875China International Center for Quantum MaterialsSchool of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum MatterBeijing 100871China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2022年第31卷第11期

页      面：536-541页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0701[理学-数学] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.12074042 and 11704033) the National Key Research and Development Program of China(Grant Nos.2021YFA1400400 and 2016YFA0302300) the Fundamental Research Funds for the Central Universities 

主　　题：topological superconductor infrared spectroscopy ultrafast spectroscopy 

摘      要：Utilizing infrared spectroscopy,we study the charge dynamics of the topological superconductor candidate Sr_(x)Bi_(2)Se_(3).The frequency-dependent reflectivity R(ω)demonstrates metallic feature and the scattering rate of the free carriers decreases with temperature *** plasma edge shows a slight blue shift upon cooling,similar to the behavior of Cu_(x)Bi_(2)Se_(3).As the carrier concentration n obtained by Hall resistivity increases slightly with the decreasing temperature,the effective mass is proved to increase as well,which is in contrast with that of Cu_(x)Bi_(2)Se_(3).We also perform the ultrafast pump-probe study on the Sr_(0.2)Bi_(2)Se_(3)*** its parent compound Bi_(2)Se_(3),three distinct relaxation processes are found to contribute to the transient ***,the deduced relaxation times are quite *** addition,the electron-optical-phonon coupling constant is identified to beλ=0.88.