Chen Song, Fu Hua-Hua
School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.
Institute for Quantum Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.
J Phys Chem Lett. 2023 Dec 14;14(49):11076-11083. doi: 10.1021/acs.jpclett.3c02648. Epub 2023 Dec 4.
Chirality-induced spin selectivity (CISS) effect in straight helical molecules has received intense studies in past decade; however, the CISS effect in circular helical molecules (CHMs) has still rarely been explored. Here, we have constructed single CHMs having chirality-induced spin-orbit coupling (SOC) and connected by two nonmagnetic leads and successfully gained the required conditions for CISS effect occurring in CHMs for the first time. Our results uncover that only when the CHMs form a closed loop and when the lattice positions are coupled asymmetrically with both leads does the CISS effect occur. More importantly, the CISS-associated spin-dependent destructive and constructive quantum interference (QI) together with their phase transition appears in CHMs. The combination of CISS effect and spin-dependent QI phenomena opens up a new door to understand the underlying physics of the CISS effect in helical molecules.
在过去十年中，直链螺旋分子中的手性诱导自旋选择性（CISS）效应受到了广泛研究；然而，环状螺旋分子（CHMs）中的CISS效应仍鲜有探索。在此，我们构建了具有手性诱导自旋轨道耦合（SOC）且由两条非磁性引线连接的单个CHMs，并首次成功获得了CHMs中发生CISS效应的必要条件。我们的结果表明，只有当CHMs形成闭环且晶格位置与两条引线不对称耦合时，才会出现CISS效应。更重要的是，与CISS相关的自旋相关的相消和相长量子干涉（QI）及其相变出现在CHMs中。CISS效应与自旋相关QI现象的结合为理解螺旋分子中CISS效应的潜在物理机制打开了一扇新的大门。
