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在原子薄核绝缘体MnBi2Te4中的压力调节相变
Albin Márffy1,2, Endre Tóvári1,2, Yu-Fei Liu3,4
1Department of Physics, Budapest University of Technology and Economics, Müegyetem rkp. 3., H-1111 Budapest, Hungary.
Nano letters
|January 29, 2026
概括
奇数层MnBi2Te4是一种磁性拓绝缘体,很少表现出量子异常的霍尔效应. 研究显示,由于混乱而导致的微不足道的绝缘体状态,但在高磁场中会出现切尔恩绝缘体状态.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学是一种材料科学.
- 量子现象是一种量子现象.
背景情况:
- 具有时间逆向对称性破裂的拓绝缘体 (TI) 可以容纳量子异常霍尔效应 (QAHE).
- MnBi2Te4是一种固有的磁性TI材料,使其成为观测QAHE的有希望的候选者,但实验实现仍然具有挑战性.
研究的目的:
- 研究奇数层厚的MnBi2Te4.4的电子传输特性.
- 确定在这种材料中出现QAHE或相关的拓状态的条件.
- 了解磁场和水静压等外部刺激对磁性和拓性质的影响.
主要方法:
- 磁阻测量是在奇数层厚的MnBi2Te4样本上进行的.
- 实验是在反铁磁阶段,在不同的磁场和温度下进行的.
- 应用了液压压力来研究其对磁性合和带结构的影响.
主要成果:
- 在反铁磁阶段,观察到一种碎的绝缘体状态,归因于障碍,而不是预期的QAHE.
- 切尔恩绝缘体状态被发现在高磁场下出现.
- 发现水立压能增强层间交换合,同时削弱层内合.
- 在压力下,微不足道的带间隙减少了,表明混乱的作用减少了.
结论:
- 疾病在抑制MnBi2Te4.4中的QAHE中起着重要作用.
- 高磁场可以诱导拓相位过渡到切尔恩绝缘体状态.
- 水静压提供了一条调整磁交换相互作用的途径,并可能减轻MnBi2Te4.4中障碍效应.
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