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Optical study of magnetic topological insulator MnBi4Te7 |
| Zhi-Yu Liao(廖知裕)1,2, Bing Shen(沈冰)3, Xiang-Gang Qiu(邱祥冈)1,2,4,†, and Bing Xu(许兵)1,2,‡ |
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China;
4 Songshan Lake Materials Laboratory, Dongguan 523808, China |
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Abstract We present an infrared spectroscopy study of the magnetic topological insulator MnBi4Te7 with antiferromagnetic (AFM) order below the Néel temperature TN = 13 K. Our investigation reveals that the low-frequency optical conductivity consists of two Drude peaks, indicating a response of free carriers involving multiple bands. Interestingly, the narrow Drude peak grows strongly as the temperature decreases, while the broad Drude peak remains relatively unchanged. The onset of interband transitions starts around 2000 cm-1, followed by two prominent absorption peaks around 10000 cm-1 and 20000 cm-1. Upon cooling, there is a notable transfer of spectral weight from the interband transitions to the Drude response. Below TN, the AFM transition gives rise to small anomalies of the charge response due to a band reconstruction. These findings provide valuable insights into the interplay between magnetism and the electronic properties in MnBi4Te7.
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Received: 07 October 2023
Revised: 01 November 2023
Accepted manuscript online: 02 November 2023
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PACS:
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78.30.-j
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(Infrared and Raman spectra)
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78.40.Kc
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(Metals, semimetals, and alloys)
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78.47.-p
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(Spectroscopy of solid state dynamics)
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| Fund: Project supported by the the National Natural Science Foundation of China (Grant No. 12274442) and the National Key R&D Program of China (Grant No. 2022YFA1403901). |
Corresponding Authors:
Xiang-Gang Qiu, Bing Xu
E-mail: xgqiu@iphy.ac.cn;bingxu@iphy.ac.cn
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Cite this article:
Zhi-Yu Liao(廖知裕), Bing Shen(沈冰), Xiang-Gang Qiu(邱祥冈), and Bing Xu(许兵) Optical study of magnetic topological insulator MnBi4Te7 2024 Chin. Phys. B 33 017802
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