Optical study on topological superconductor candidate Sr-doped Bi2Se3

Utilizing infrared spectroscopy,we study the charge dynamics of the topological superconductor candidate SrxBi2Se3.The frequency-dependent reflectivity R(ω)demonstrates metallic feature and the scattering rate of the free carriers de-creases with temperature decreasing.The plasma edge shows a slight...

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Bibliographic Details
Published in:Chinese physics B 2022-10, Vol.31 (11), p.607-612
Main Authors: Liu, Jialun, Wang, Chennan, Lin, Tong, Cao, Liye, Wang, Lei, Li, Jiaji, Tao, Zhen, Shen, Nan, Wu, Rina, Fang, Aifang, Wang, Nanlin, Chen, Rongyan
Format: Article
Language:English
Subjects:
infrared spectroscopy
topological superconductor
ultrafast spectroscopy
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Summary:Utilizing infrared spectroscopy,we study the charge dynamics of the topological superconductor candidate SrxBi2Se3.The frequency-dependent reflectivity R(ω)demonstrates metallic feature and the scattering rate of the free carriers de-creases with temperature decreasing.The plasma edge shows a slight blue shift upon cooling,similar to the behavior of CuxBi2Se3.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 CuxBi2Se3.We also perform the ultra-fast pump-probe study on the Sr0.2Bi2Se3 compounds.Resembling its parent compound Bi2Se3,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 λ = 0.88.
ISSN:1674-1056
DOI:10.1088/1674-1056/ac7a10