Electrically precise control of the spin polarization of electronic transport at the single-molecule level.,Physical Chemistry Chemical Physics

当前位置： X-MOL 学术 › Phys. Chem. Chem. Phys. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Electrically precise control of the spin polarization of electronic transport at the single-molecule level.
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020-07-08 , DOI: 10.1039/d0cp01868f
Yan-Dong Guo ₁ , Jin-Jie Wang , Hong-Li Zeng , Yu-Rong Yang , Xin-Xin Xu , Xiao-Hong Yan

Affiliation

Compared with the conventional magnetic means (such as ferromagnetic contacts), controlling a spin current by electrical methods could largely reduce the energy consumption and dimensions of nano-devices, which has become a focus of research in spintronics. Inspired by recent progress in the synthesis of an iron-based metal–organic nanostructure, we investigate the spin-dependent electronic transport of the molecule of Fe₃–terpyridine-phenyl-phenyl-terpyridine–Fe₃ (Fe₃–TPPT–Fe₃) through first-principles calculations, and propose a three-terminal device without ferromagnetics. By applying a gate voltage, not only the spin polarization can be switched between 100% and −100% to achieve a dual-spin filter, but also its fine regulation can be realized, where the transmission with any ratio of spin-up to spin-down electron numbers is achievable. Analysis shows that the particular transmission spectra are the key mechanism, where two peaks reside discretely on both sides of the Fermi level with opposite spins. Such a feature is found to be robust to the number of Fe atoms and TPPT chain length, suggesting that it is an intrinsic feature of such systems and very conducive to practical applications. The electrical control (such as an electric field) of spin polarization is realized at the single-molecule level, showing great application potential.

中文翻译：

在单分子水平上精确控制电子传输的自旋极化。

与传统的磁性手段（如铁磁触点）相比，通过电学方法控制自旋电流可以大大降低纳米器件的能耗和尺寸，这已成为自旋电子学研究的重点。受铁基金属有机纳米结构合成的最新进展启发，我们研究了Fe _3-吡啶-苯基-苯基-苯基-吡啶-Fe ₃（Fe ₃ -TPPT-Fe ₃）通过第一性原理计算，并提出了一种无铁磁的三端器件。通过施加栅极电压，不仅可以将自旋极化在100％和-100％之间切换以实现双自旋滤波器，而且还可以实现其精细调节，其中传输具有自旋与自旋的任何比率向下电子数是可以实现的。分析表明，特定的透射光谱是关键机制，其中两个峰以相反的自旋离散地位于费米能级的两侧。发现这种特征对Fe原子的数目和TPPT链长具有鲁棒性，表明这是此类系统的固有特征，并且非常有利于实际应用。自旋极化的电控制（例如电场）是在单分子水平上实现的，

更新日期：2020-08-05

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11