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在 Nd-doped Bi_1.1Sb_0.9STe₂的拓绝缘体单晶中出现异常的霍尔效应

Lei Chen¹, Weiyao Zhao², Kaijian Xing³

¹School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China. zrk@ustc.edu.

Physical chemistry chemical physics : PCCP

|January 4, 2024

概括

在拓绝缘器中使用稀土元素的兴奋剂使铁磁排序成为可能,为量子异常霍尔效应研究铺平了道路. 这项研究探讨了Nd-doped Bi$_{1.1}$Sb$_{0.9}$STe$_{2}$用于先进的量子运输和旋转子应用.

科学领域:

凝聚物质物理学凝聚物质物理学
材料科学材料科学材料科学
量子现象是一种量子现象.

背景情况:

拓绝缘体具有独特的表面状态,由对称性保护.
量子异常霍尔效应 (QAHE) 是在磁拓绝缘体中观察到的关键现象.
实现强大的磁性排序对于实现QAHE至关重要.

研究的目的:

在散装绝缘型拓绝缘体单晶体中引入铁磁排序.
为了研究被杂的拓绝缘体的电子传输特性.
探索量子运输和自旋电子学的潜在应用.

主要方法:

用稀土元素 (Nd) 的单晶生物化.
磁性排序及其温度依赖性的特征.
测量电子传输特性,包括舒布尼科夫-德哈斯振荡.

主要成果:

在成功地将Nd化为Bi$_{1.1}$Sb$_{0.9}$STe$_{2}$后,铁磁性约为100K左右.
在铁磁体制中观察到由拓表面状态主导的电子运输.
在低温下检测到Shubnikov-de Haas振荡,呈现出非碎的Berry阶段.

结论:

Nd-doped Bi$_{1.1}$Sb$_{0.9}$STe$_{2}$单晶为研究磁拓绝缘体提供了一个有前途的平台.
观察到的现象支持量子运输研究和旋转器件应用的潜力.
这些兴奋剂材料的远程磁性排序是它们独特电子性质的关键.

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