论文标题
DNA双螺旋中电子的振动增强自旋传输转运
Vibration-Enhanced Spin-Selective Transport of Electrons in DNA Double Helix
论文作者
论文摘要
通过螺旋分子的自旋选择性传输一直是凝聚态物理学的热门话题，因为它在旋转中开发了新的研究方向，\ emph {i.e。}，chiro-spintronics。双链DNA（dsDNA）分子已被认为是研究该主题的有前途的候选者，因为在实验中观察到了手性诱导的自旋选择性（CISS）效应。考虑到dsDNA分子通常在机械性能中是柔性的，因此振动可能是影响CISS效应的重要因素之一。在这里，我们研究了电子振动相互作用（EVI）对DSDNA分子中自旋选择转运的影响。我们发现EVI不仅增强了DSDNA中的CISS效应和自旋极化（$ P_S $），而且还诱发了一系列新的自旋传输模式。更有趣的是，这些振动引起的传输光谱倾向于容纳与原始旋转传输模式的$ P_S $值相同的$ P_S $值，从而使$ p_s $ spectra即使在能量差距中也可以显示为连续平台。我们的工作不仅使我们深入了解振动对螺旋分子中CISS效应的影响，而且还提出了可行的途径，以检测低维分子系统中振动诱导的自旋偏振转运
The spin-selective transport through helical molecules has been a hot topic in condensed matter physics, because it develops a new research direction in spintronics, \emph{i.e.}, chiro-spintronics. Double-stranded DNA (dsDNA) molecules have been considered as promising candidates to study this topic, since the chiral-induced spin selectivity (CISS) effect in dsDNA was observed in experiment. Considering that the dsDNA molecules are usually flexible in mechanical properties, vibration may be one of important factors to influence the CISS effect. Here, we investigate the influences of electron-vibration interaction (EVI) on the spin-selective transport in dsDNA molecules. We uncover that the EVI not only enhances the CISS effect and the spin polarization ($P_s$) in dsDNA, but also induces a series of new spin-splitting transmission modes. More interesting, these vibration-induced transmission spectra tend to host the same $P_s$ values as those of the original spin-splitting transmission modes, making the $P_s$ spectra to display as a continuous platform even in the energy gap. Our work not only provides us a deep understanding into the influence of vibrations on the CISS effect in helical molecules, {but also puts forwards a feasible route to detect the vibration-induced spin-polarized transport in low-dimensional molecular systems
