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新兴的非碎的拓在稀土皮尼克提德的超薄膜中

Dai Q Ho^1,2, Ruiqi Hu¹, D Quang To¹

¹Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, United States.

|October 23, 2023

概括

超薄的稀土单片意外地呈现出量子自旋霍尔绝缘体相. 这是由于量子封闭效应和带逆转而发生的,通过旋转轨道合打开了一个空隙.

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
拓学材料拓学材料

背景情况:

稀土单化物 (RE-V) 是半金属,具有重叠的电子和孔口袋.
预计量子束效应 (QCE) 将诱导薄膜中的半导体行为.
量子自旋霍尔 (QSH) 绝缘体相是一种拓状态,有可能用于自旋电子应用.

研究的目的:

研究超薄稀土单片的电子特性.
确定量子封闭效应是否导致半导体或拓绝缘行为.
探索旋转轨道合 (SOC) 在观察到的现象中的作用.

主要方法:

制造面向 (001) 的LaSb薄膜,其厚度为7,5和3个单层 (ML).
电子带结构的理论分析,考虑量子封闭和自旋轨道合.
带逆转和拓相位过渡的识别.

主要成果:

超薄的LaSb薄膜显示量子自旋霍尔 (QSH) 绝缘体相,而不是简单的半导体相.
在平面内的电子口袋上强大的QCE和在平面外的电子口袋上缺乏限制导致带逆转.
旋转轨道合在超薄膜中打开了一个重要的拓差距.

结论:

量子自旋霍尔绝缘体阶段可以在超薄的稀土单片膜中实现.
这种现象源于特定的量子封闭效应和带逆转.
这些发现预计对RE-V材料具有一般性,并可能为探索磁性-拓学合提供新的途径.

关键词:

偶数和奇数频段间隙振荡振荡量子束效应是一种量子束效应.量子自旋霍尔绝缘体量子自旋霍尔绝缘体稀土单基化物稀土单化物薄膜薄膜是一种薄膜.

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