Tunable chiral magneto-transport through band structure engineering in magnetic topological insulators Mn(Bi <sub> 1− <i>x</i> </sub> Sb <i> <sub>x</sub> </i> ) <sub>2</sub> Te <sub>4</sub>

Berry curvature and spin texture are representative tuning parameters that govern spin-orbit coupling-related physics and are also the foundation for future device applications. Here, we investigate the impact of the Sb-to-Bi ratio on shaping the electronic band structure and its correlated first- and second-harmonic magneto-transport signals in the intrinsic magnetic topological insulator Mn(Bi<sub>1-<i>x</i></sub>Sb<i><sub>x</sub></i>)<sub>2</sub>Te<sub>4</sub>. First-principles calculations reveal that the introduction of Sb not only triggers a topological phase transition but also changes the integral of the Berry curvature at the shifted Fermi level, which leads to the reversal of the anomalous Hall resistance polarity for Sb fractions <i>x</i> > 0.67. Moreover, it also induces the opposite spin splitting of the valence bands compared to the Sb-free host, and the resulting clockwise/counterclockwise spin chirality gives rise to a tunable unidirectional second-harmonic anomalous Hall response. Our findings pave the way for constructing chiral spin-orbitronic devices through band structure engineering.

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Publication Details

Journal
Science Advances
Published
2025-05-16
DOI
https://doi.org/10.1126/sciadv.adt6084
Citations
3
Primary Topic
Topological Materials and Phenomena
Type
article
Field-Weighted Citation Impact
3.74
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Tunable chiral magneto-transport through band structure engineering in magnetic topological insulators Mn(Bi 1− x Sb x ) 2 Te 4

Jin Zou, Xufeng Kou, T. Hesjedal, Peng Chen et al.
3 citations
Science Advances
Topological Materials and Phenomena
3.74
article

Tunable chiral magneto-transport through band structure engineering in magnetic topological insulators Mn(Bi 1− x Sb x ) 2 Te 4

Jin Zou, Xufeng Kou, T. Hesjedal, Peng Chen, J. J. Liu, Jieyi Liu, Qiang Sun, Yumeng Yang, Zhongkai Liu, Liyang Liao, Puyang Huang, Yifan Zhang, Zeyu Li, Xiaodong Han, Qi Yao, Zhenhua Qiao, XI-LEI CAI, Guanying Yang, Xinqi Liu, Ang Li
article en
3 citations

Abstract

Berry curvature and spin texture are representative tuning parameters that govern spin-orbit coupling-related physics and are also the foundation for future device applications. Here, we investigate the impact of the Sb-to-Bi ratio on shaping the electronic band structure and its correlated first- and second-harmonic magneto-transport signals in the intrinsic magnetic topological insulator Mn(Bi<sub>1-<i>x</i></sub>Sb<i><sub>x</sub></i>)<sub>2</sub>Te<sub>4</sub>. First-principles calculations reveal that the introduction of Sb not only triggers a topological phase transition but also changes the integral of the Berry curvature at the shifted Fermi level, which leads to the reversal of the anomalous Hall resistance polarity for Sb fractions <i>x</i> > 0.67. Moreover, it also induces the opposite spin splitting of the valence bands compared to the Sb-free host, and the resulting clockwise/counterclockwise spin chirality gives rise to a tunable unidirectional second-harmonic anomalous Hall response. Our findings pave the way for constructing chiral spin-orbitronic devices through band structure engineering.

Science AdvancesVol. 11(20)
University of Science and Technology of China (CN), University of Shanghai for Science and Technology (CN), The University of Queensland (AU), National University of Defense Technology (CN), Sichuan University (CN), Diamond Light Source (GB), Southern University of Science and Technology (CN), ShanghaiTech University (CN), Beijing University of Technology (CN), University of Oxford (GB), Shanghai Institute of Microsystem and Information Technology (CN), University of Chinese Academy of Sciences (CN), The University of Tokyo (JP)
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Openalex Percentile: Top 7%
Topological Materials and Phenomena
3.74
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