日本分子科学研究所D. Hirobe、H. M. Yamamoto团队在研究中取得进展。他们的研究显示，手性超导体中的巨大自旋极化和一对反平行自旋。这一研究成果发表在2023年1月18日出版的国际学术期刊《自然》上。

该研究组报道了在有机手性超导体中，通过在超导转变温度附近的磁电阻测量，同时观察到这两种现象。通过空间映射交流电激发中的自旋极性，证明了一对相反极化的自旋。得到的自旋极化比Edelstein效应的自旋极化高出几个数量级，表明自旋-轨道相互作用得到了有效的增强。

他们的结果证明了手性分子自旋积累的固态模拟，并可能为其分子对应物的起源提供线索。此外，自旋电流的创新能力将为超导自旋电子学研究注入活力。

据悉，手性分子可以表现出自旋选择性电荷发射，称为手性诱导自旋选择性。尽管分子的组成成分是轻元素，但它们的自旋极化可以接近甚至超过典型的铁磁体。这种强大的能力可能会导致在手性自旋电子学领域的应用。尽管自旋选择性的起源是难以确定的，但基于实验结果提出了两种微观现象：自旋轨道相互作用的有效增强和由一对相反极化自旋所代表的手性。然而，这些假设仍有待证实。

附：英文原文

Title: Giant spin polarization and a pair of antiparallel spins in a chiral superconductor

Author: Nakajima, R., Hirobe, D., Kawaguchi, G., Nabei, Y., Sato, T., Narushima, T., Okamoto, H., Yamamoto, H. M.

Issue&Volume: 2023-01-18

Abstract: Chiral molecules can exhibit spin-selective charge emission, which is known as chirality-induced spin selectivity1,2. Despite the constituent light elements of the molecules, their spin polarization can approach or even exceed that of typical ferromagnets. This powerful capability may lead to applications in the chiral spintronics2 field. Although the origin of spin selectivity is elusive, two microscopic phenomena have been suggested based on experimental results: effective enhancement of spin–orbit interactions3 and chirality represented by a pair of oppositely polarized spins4,5. However, the hypotheses remain to be verified. Here we report the simultaneous observation of these two phenomena in an organic chiral superconductor by magnetoresistance measurements in the vicinity of the superconducting transition temperature. A pair of oppositely polarized spins is demonstrated by spatially mapping the spin polarity in an electric alternating current excitation. The obtained spin polarization exceeds that of the Edelstein effect6,7,8,9,10 by several orders of magnitude, which indicates an effective enhancement of the spin–orbit interaction. Our results demonstrate a solid-state analogue of spin accumulations assumed for chiral molecules, and may provide clues to the origin of their molecular counterparts. In addition, the innovative capability of spin-current sourcing will invigorate superconducting spintronics research11.

DOI: 10.1038/s41586-022-05589-x

Source: https://www.nature.com/articles/s41586-022-05589-x