Heisenberg Spin-dynamics Group, Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Straße 1, D-76131 Karlsruhe, Germany.
Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Straße 1, D-76131 Karlsruhe, Germany.
ACS Nano. 2023 May 23;17(10):9575-9585. doi: 10.1021/acsnano.3c02876. Epub 2023 May 8.
Spin-orbit coupling (SOC) is a fundamental physical interaction, which describes how the electrons' spin couples to their orbital motion. It is the source of a vast variety of fascinating phenomena in nanostructures. Although in most theoretical descriptions of high-temperature superconductivity SOC has been neglected, including this interaction can, in principle, revise the microscopic picture. Here by preforming energy-, momentum-, and spin-resolved spectroscopy experiments we demonstrate that while probing the dynamic charge response of the FeSe monolayer on strontium titanate, a prototype two-dimensional high-temperature superconductor using electrons, the scattering cross-section is spin dependent. We unravel the origin of the observed phenomenon and show that SOC in this two-dimensional superconductor is strong. We anticipate that such a strong SOC can have several consequences on the electronic structures and may compete with other pairing scenarios and be crucial for the mechanism of superconductivity.
自旋轨道耦合（SOC）是一种基本的物理相互作用，它描述了电子的自旋如何与其轨道运动耦合。它是在纳米结构中产生各种迷人现象的根源。尽管在高温超导的大多数理论描述中忽略了 SOC，但原则上包含这个相互作用可以修正微观图像。在这里，我们通过进行能量、动量和自旋分辨的光谱实验，证明了当使用电子探测二维高温超导钙钛矿钛酸锶上 FeSe 单层的动态电荷响应时，散射截面是与自旋相关的。我们揭示了观察到的现象的起源，并表明在这个二维超导体中 SOC 很强。我们预计，这种强 SOC 可能会对电子结构产生多种影响，并可能与其他配对方案竞争，对超导机制至关重要。
