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在铁电半导体中推进巨型拉什巴效应的厚度极限

Boris Croes¹, Alexandre Llopez¹, Calvin Tagne-Kaegom²

¹Aix Marseille Univ, CNRS, CINAM, AMUtech, 13288 Marseille, France.

|October 14, 2024

概括

铁电Rashba半导体 (FERSCs) 呈现出一个巨大的Rashba效应,直至1nm厚度. 这种持久性是由于这些自旋轨道电子材料中的介面反补偿空缺.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
量子力学就是量子力学.

背景情况:

铁电Rashba半导体 (FERSCs) 是节能自旋轨道电子的关键.
了解这些效应的厚度极限对于设备应用至关重要.

研究的目的:

在α-GeTe薄膜中研究Rashba-Spin-Orbit Coupling (SOC) 效应的最小厚度.
探索Rashba效应在减少厚度时持续存在的潜在机制.

主要方法:

角度分辨率光辐射光谱学 (ARPES) 探测电子带结构.
第一个原则计算用于对原始GeTe的理论分析.
射线光辐射光谱学 (XPS) 用于分析薄膜组成和缺陷.

主要成果:

α-GeTe(111) 薄膜在覆盖着Sb的Si(111) 基板上表现出一个巨大的Rashba效应,厚度低至1纳米.
拉什巴常数即使在1nm时也仍然显著 (5.2±0.5 eV·Å).
XPS揭示了接口Sb原子补偿Ge空位,从而保持Rashba效应.

结论:

在α-GeTe中的巨大的Rashba效应是强大的,并持续到超薄膜 (1纳米).
使用Sb的接口工程是一种可行的策略,可以在FERSC中保持旋转轨道合效应.
这些发现为开发下一代节能自旋轨道电子设备铺平了道路.

关键词:

标签: 大家来了拉什巴的旋转纹理铁电 Rashba 半导体半导体量子井是一个量子井.效果的大小效果大小效果运输属性运输属性运输属性

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