| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Optical study on topological superconductor candidate Sr-doped Bi2Se3 |
| Jialun Liu(刘佳伦)1, Chennan Wang(王晨南)2,†, Tong Lin(林桐)2, Liye Cao(曹立叶)1, Lei Wang(王蕾)1, Jiaji Li(李佳吉)1, Zhen Tao(陶镇)1, Nan Shen(申娜)1, Rina Wu(乌日娜)1, Aifang Fang(房爱芳)1, Nanlin Wang(王楠林)2,3, and Rongyan Chen(陈荣艳)1,‡ |
1 Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China;
2 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China;
3 Collaborative Innovation Center of Quantum Matter, Beijing 100871, China |
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Abstract Utilizing infrared spectroscopy, we study the charge dynamics of the topological superconductor candidate Sr$_x$Bi$_2$Se$_3$. The frequency-dependent reflectivity $R(\omega$) demonstrates metallic feature and the scattering rate of the free carriers decreases with temperature decreasing. The 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$_3$ compounds. Resembling its parent compound Bi$_2$Se$_3$, three distinct relaxation processes are found to contribute to the transient reflectivity. However, the deduced relaxation times are quite different. In addition, the electron-optical-phonon coupling constant is identified to be $\lambda = 0.88$.
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Received: 18 February 2022
Revised: 14 June 2022
Accepted manuscript online: 18 June 2022
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PACS:
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74.70.-b
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(Superconducting materials other than cuprates)
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78.30.-j
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(Infrared and Raman spectra)
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78.47.jg
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(Time resolved reflection spectroscopy)
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| Fund: 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), and the Fundamental Research Funds for the Central Universities. |
Corresponding Authors:
Rongyan Chen
E-mail: rychen@bnu.edu.cn
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Cite this article:
Jialun Liu(刘佳伦), Chennan Wang(王晨南), Tong Lin(林桐), Liye Cao(曹立叶), Lei Wang(王蕾), Jiaji Li(李佳吉), Zhen Tao(陶镇), Nan Shen(申娜), Rina Wu(乌日娜), Aifang Fang(房爱芳), Nanlin Wang(王楠林), and Rongyan Chen(陈荣艳) Optical study on topological superconductor candidate Sr-doped Bi2Se3 2022 Chin. Phys. B 31 117402
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