论文标题
手性驱动的DNA样材料的拓扑电子结构
Chirality driven topological electronic structure of DNA-like materials
论文作者
论文摘要
DNA和类似手性分子的几何形状的拓扑方面受到了很多关注，而其电子结构的拓扑则较少。先前的实验表明，DNA可以在金属触点之间有效滤波自旋偏振电子，这一过程称为手性诱导的自旋选择性（CISS）。但是，手性结构与电子自旋之间的基本相关性仍然难以捉摸。在这项工作中，我们揭示了频带结构中的轨道纹理，这是手性诱导的拓扑特征。我们发现这种轨道质地使手性分子能够使量子轨道偏振。这种轨道极化效应（OPE）诱导自旋极化，从金属接触的自旋轨道相互作用辅助，并导致磁静脉和手性分离。光电子的轨道角动量在相关光发射实验中也起着至关重要的作用。除了CISS之外，我们预测OPE即使在Achiral但破裂的材料中也可以诱导自旋选择性现象。
Topological aspects of the geometry of DNA and similar chiral molecules have received a lot of attention, while the topology of their electronic structure is less explored. Previous experiments have revealed that DNA can efficiently filter spin-polarized electrons between metal contacts, a process called chiral-induced spin-selectivity (CISS). However, the underlying correlation between chiral structure and electronic spin remains elusive. In this work, we reveal an orbital texture in the band structure, a topological characteristic induced by the chirality. We find that this orbital texture enables the chiral molecule to polarize the quantum orbital. This orbital polarization effect (OPE) induces spin polarization assisted by the spin-orbit interaction from a metal contact and leads to magnetorestistance and chiral separation. The orbital angular momentum of photoelectrons also plays an essential role in related photoemission experiments. Beyond CISS, we predict that OPE can induce spin-selective phenomena even in achiral but inversion-breaking materials.
