Liu Tianhan, Weiss Paul S
Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States.
Departments of Chemistry and Biochemistry, Bioengineering, and Materials Science and Engineering and California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States.
ACS Nano. 2023 Oct 24;17(20):19502-19507. doi: 10.1021/acsnano.3c06133. Epub 2023 Oct 4.
Chirality-induced spin selectivity (CISS) is a recently discovered effect in which structural chirality can result in different conductivities for electrons with opposite spins. In the CISS community, the degree of spin polarization is commonly used to describe the efficiency of the spin filtering/polarizing process, as it represents the fraction of spins aligned along the chiral axis of chiral materials originating from non-spin-polarized currents. However, the methods of defining, calculating, and analyzing spin polarization have been inconsistent across various studies, hindering advances in this field. In this Perspective, we connect the relevant background and the definition of spin polarization, discuss its calculation in different contexts in the CISS, and propose a practical and meaningful figure of merit by quantitative analysis of magnetoresistance in CISS transport studies.
手性诱导自旋选择性（CISS）是最近发现的一种效应，其中结构手性可导致具有相反自旋的电子具有不同不同的电导率不同。在CISS领域，自旋极化程度通常用于描述自旋过滤/极化过程的效率，因为它表示源自非自旋极化电流的沿手性材料手性轴排列的自旋分数。然而，在各种研究中，定义、计算和分析自旋极化的方法一直不一致，这阻碍了该领域的进展。在这篇观点文章中，我们阐述了相关背景和自旋极化的定义，讨论了其在CISS不同情况下的计算，并通过对CISS输运研究中的磁电阻进行定量分析，提出了一个实用且有意义的品质因数。
