Magneto-optical quantum excitations and spintronics effects in chiral (CH)x

非技术性描述下一代电子应用和设备将更快，保真度更高，需要更小的设备功能和更少的散热。微小的电子磁矩，称为自旋，其方向可以表示信息，在设备中的使用不如其电荷多。目前，基于自旋的量子信息器件正在开发中，以实现这些目标。 众所周知的导电聚合物的新形式，即（CH）n（其中n是大于~20的数值指数），其以微观成束链的形式进入纤维和环，提供了提供此类器件中所需的长自旋相干性的机会。在这个项目中，光对（CH）n的影响将使用先进的光学和磁光光谱来表征。该项目将有助于开发新的、增强的电子元件，即用于许多应用的集成电路。此外，该项目还将培训本科生和研究生，从而为美国未来的劳动力做出贡献。技术说明对新型手性和环状聚乙炔（CH）n薄膜中顺磁（即自旋携带）电子激发的理解可能会带来新的量子传感、自旋电子学和光电子器件概念。在本项目中，我们将研究（CH）n中的中性光激发，这是由四个纠缠的中性自旋1/2孤子组成的，它们具有很长的自旋相干时间和很强的手征效应。 在这项研究中，我们将使用大量的合成，电，磁，自旋电子学以及瞬态和稳态光学和磁光技术来研究自旋寿命，自旋扩散现象，以及在手性和环状（CH）x薄膜和自旋电子器件中注入和光生电子激发的光学性质。特别是这些调查将进行使用圆偏振稳态和瞬态光谱在一个广泛的光谱范围为0.4-15微米和时间范围从100 fs到秒。我们还将使用磁光和各种稳态和瞬态光学检测磁共振技术，以及理论模型，以加深我们对（CH）n中新的中性激发的理解。该奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

Non-technical DescriptionNext generation electronic applications and devices will be faster with greater fidelity and require smaller device features with less heat dissipation. The tiny electron magnetic moment, called spin of which direction can represent information, has not been used in devices as much as its charge. These days, spin-based quantum information devices are being developed to achieve these objectives. New forms of the well-known conducting polymer, namely (CH)n (where n is a numerical index larger than ~20) that come in the form of microscopic bundled chains into fibers and rings, offers opportunities to provide long spin coherence that is required in such devices. In this project, the effect of light on (CH)n will be characterized using advanced optical and magneto-optical spectroscopies. This project will contribute to the development of new, enhanced components for electronics, i.e. integrated circuits, for numerous applications. In addition this project will also train undergraduate and graduate students and, thus, contribute to the future workforce of the US.Technical DescriptionThe understanding of paramagnetic, i.e. spin-carrying, electronic excitations in the novel chiral and cyclic forms of polyacetylene, (CH)n films could lead to new quantum sensing, spintronics and optoelectronic device concepts. In this project we will investigate the neutral photoexcitations in (CH)n which are composed of four entangled neutral spin 1/2 solitons having very long spin-coherence times and strong chiral effects. For this research we will use a large arsenal of synthesis, electrical, magnetic, spintronics as well as transient and steady state optical and magneto-optical techniques to study spin lifetimes, spin diffusion phenomena, and optical properties of injected and photogenerated electronic excitations in chiral and cyclic (CH)x films and spintronic devices. In particular these investigations will be carried out using circularly polarized steady state and transient spectroscopies in a broad spectral range of 0.4-15 microns and time ranging from 100 fs to seconds. We will also use magneto-optics and various steady state and transient optically detected magnetic resonance techniques, as well as theoretical models to deepen our understanding of the novel neutral excitations in (CH)n.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.