The electrons in 2D systems with broken inversion symmetry are spin-polarized due to spin-orbit coupling and provide perfect targets for observing exotic spin-related fundamental phenomena. We observe a Fermi surface with a novel spin texture in the 2D metallic system formed by indium double layers on Si(111) and find that the primary origin of the spin-polarized electronic states of this system is the orbital angular momentum and not the so-called Rashba effect. The present results deepen the understanding of the physics arising from spin-orbit coupling in atomic-layered materials with consequences for spintronic devices and the physics of the superconducting state.

中文翻译：

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轨道角动量引起的二维金属带自旋极化

具有反转反转对称性的二维系统中的电子由于自旋轨道耦合而被自旋极化，并为观察奇异的自旋相关基本现象提供了理想的目标。我们在由Si（111）上的铟双层形成的2D金属系统中观察到具有新颖自旋织构的费米表面，发现该系统的自旋极化电子态的主要起源是轨道角动量，而并非如此所谓的拉什巴效应。本研究结果加深了对原子层材料中自旋轨道耦合产生的物理学的理解，对自旋电子器件和超导态的物理学产生了影响。