Optical study of magnetic topological insulator MnBi4Te7

doi:10.1088/1674-1056/ad08aa

中国物理B ›› 2024, Vol. 33 ›› Issue (1): 17802-17802.doi: 10.1088/1674-1056/ad08aa

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

收稿日期:2023-10-07 修回日期:2023-11-01 接受日期:2023-11-02 出版日期:2023-12-13 发布日期:2023-12-13
通讯作者: Xiang-Gang Qiu, Bing Xu E-mail:xgqiu@iphy.ac.cn;bingxu@iphy.ac.cn
基金资助:
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).

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

Received:2023-10-07 Revised:2023-11-01 Accepted:2023-11-02 Online:2023-12-13 Published:2023-12-13
Contact: Xiang-Gang Qiu, Bing Xu E-mail:xgqiu@iphy.ac.cn;bingxu@iphy.ac.cn
Supported by:
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).

摘要/Abstract

摘要： We present an infrared spectroscopy study of the magnetic topological insulator MnBi₄Te₇ with antiferromagnetic (AFM) order below the Néel temperature T_N = 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 T_N, 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.

关键词: infrared spectroscopy, magnetic topological insulator, Drude model, band reconstruction

Abstract: We present an infrared spectroscopy study of the magnetic topological insulator MnBi₄Te₇ with antiferromagnetic (AFM) order below the Néel temperature T_N = 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 T_N, 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.

Key words: infrared spectroscopy, magnetic topological insulator, Drude model, band reconstruction

中图分类号: (Infrared and Raman spectra)

78.30.-j

78.40.Kc (Metals, semimetals, and alloys) 78.47.-p (Spectroscopy of solid state dynamics)

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[J]. 中国物理B, 2024, 33(1): 17802-17802.

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[J]. Chin. Phys. B, 2024, 33(1): 17802-17802.

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Optical study of magnetic topological insulator MnBi₄Te₇

Optical study of magnetic topological insulator MnBi₄Te₇

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