Optical study of magnetic topological insulator MnBi4Te7

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 involv...

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Bibliographic Details
Published in:Chinese physics B 2023-12, Vol.33 (1), p.253-258
Main Authors: Liao, Zhi-Yu, Shen, Bing, Qiu, Xiang-Gang, Xu, Bing
Format: Article
Language:English
Subjects:
band reconstruction
Drude model
infrared spectroscopy
magnetic topological insulator
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Summary: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.
ISSN:1674-1056
DOI:10.1088/1674-1056/ad08aa