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Quantized anomalous Hall resistivity achieved in molecular beam epitaxy-grown MnBi2Te4 thin films.


ABSTRACT: The intrinsic magnetic topological insulator MnBi2Te4 provides a feasible pathway to the high-temperature quantum anomalous Hall (QAH) effect as well as various novel topological quantum phases. Although quantized transport properties have been observed in exfoliated MnBi2Te4 thin flakes, it remains a big challenge to achieve molecular beam epitaxy (MBE)-grown MnBi2Te4 thin films even close to the quantized regime. In this work, we report the realization of quantized anomalous Hall resistivity in MBE-grown MnBi2Te4 thin films with the chemical potential tuned by both controlled in situ oxygen exposure and top gating. We find that elongated post-annealing obviously elevates the temperature to achieve quantization of the Hall resistivity, but also increases the residual longitudinal resistivity, indicating a picture of high-quality QAH puddles weakly coupled by tunnel barriers. These results help to clarify the puzzles in previous experimental studies on MnBi2Te4 and to find a way out of the big difficulty in obtaining MnBi2Te4 samples showing quantized transport properties.

SUBMITTER: Bai Y 

PROVIDER: S-EPMC10776363 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature

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Quantized anomalous Hall resistivity achieved in molecular beam epitaxy-grown MnBi<sub>2</sub>Te<sub>4</sub> thin films.

Bai Yunhe Y   Li Yuanzhao Y   Luan Jianli J   Liu Ruixuan R   Song Wenyu W   Chen Yang Y   Ji Peng-Fei PF   Zhang Qinghua Q   Meng Fanqi F   Tong Bingbing B   Li Lin L   Jiang Yuying Y   Gao Zongwei Z   Gu Lin L   Zhang Jinsong J   Wang Yayu Y   Xue Qi-Kun QK   He Ke K   Feng Yang Y   Feng Xiao X  

National science review 20230704 2


The intrinsic magnetic topological insulator MnBi<sub>2</sub>Te<sub>4</sub> provides a feasible pathway to the high-temperature quantum anomalous Hall (QAH) effect as well as various novel topological quantum phases. Although quantized transport properties have been observed in exfoliated MnBi<sub>2</sub>Te<sub>4</sub> thin flakes, it remains a big challenge to achieve molecular beam epitaxy (MBE)-grown MnBi<sub>2</sub>Te<sub>4</sub> thin films even close to the quantized regime. In this work, w  ...[more]

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