Liu Jing, Li Chun, Jin Wei, Lefkidis Georgios, Hübner Wolfgang
Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, P.O. Box 3049, 67653 Kaiserslautern, Germany.
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China.
Phys Rev Lett. 2021 Jan 22;126(3):037402. doi: 10.1103/PhysRevLett.126.037402.
Using high-level ab initio quantum theory we suggest an optically induced subpicosecond spin-transfer scenario over 4.428 nm, a distance which is directly comparable to the actual CMOS scale. The spin-density transfer takes place between two Ni atoms and over a 40-atom-long zigzag carbon chain. The suitable combination of the local symmetries of the participating carbon atoms and the global symmetry of the whole molecule gives rise to what we term the dynamical Goodenough-Kanamori rules, allowing the long-range coupling of the two Ni atoms. We also present local spin-flip scenarios, and compare spin flip and spin transfer with respect to their sensitivity against an external static magnetic gradient. Finally, we use two identical laser pulses, rather than a single one, which allows us to accurately control local (intrasite) vs global (intersite) processes, and we thus solve the problem of embedding individually addressable molecular nanologic elements in an integrated nanospintronic circuit. Our results underline the great potential of carbon chain systems as building and supporting blocks for designing future all-optical magnetic processing units.
利用高级从头算量子理论，我们提出了一种在4.428纳米距离上的光诱导亚皮秒自旋转移方案，该距离与实际的互补金属氧化物半导体（CMOS）尺度直接可比。自旋密度转移发生在两个镍原子之间，并通过一条40个原子长的锯齿形碳链进行。参与的碳原子的局部对称性与整个分子的全局对称性的适当组合产生了我们所称的动态古迪纳夫-金森规则，使得两个镍原子能够进行长程耦合。我们还展示了局部自旋翻转方案，并比较了自旋翻转和自旋转移对外部静态磁梯度的敏感性。最后，我们使用两个相同的激光脉冲，而不是单个脉冲，这使我们能够精确控制局部（在位）与全局（位间）过程，从而解决了在集成纳米自旋电子电路中嵌入可单独寻址的分子纳米逻辑元件的问题。我们的结果强调了碳链系统作为构建和支撑未来全光磁处理单元的重要组成部分的巨大潜力。
