Spin Polarization Spectroscopy in Organic Semiconductors

非技术描述：随着电子电路的小型化接近其极限，需要找到替代方法来产生、操作、传输和检测信息，同时减少这些操作所需的能量。实现这一点的一种方法是利用电子的磁性行为，也就是众所周知的自旋。使用自旋来实现这样一种新型的信息处理被称为自旋电子学。该项目的研究重点是研究碳基所谓的有机半导体中允许自旋电子学的物理机制。这些研究特别包括对塑料薄膜中磁性现象的控制和操纵、传输和非常灵敏的检测。基于这种新材料的自旋电子器件是通过电、磁和光学测量来设计、制造和测试的。此外，大量实验工作的整合有助于有效地教育参与这些跨学科研究项目的研究生和本科生。另外，研究小组还接触了大学预科学生，以便让他们了解物理和自然科学的职业机会和技术潜力。技术描述：该项目的目标是通过可调节的自旋-轨道耦合强度来提高对有机半导体中电子自旋极化效应的理解。具体地说，该项目旨在发展对这一材料类中自旋输运的物理性质的理解。这项研究主要是利用两种自旋极化技术来研究自旋极化的载流子系综：(I)在铁磁衬底中通过共振产生的自旋波产生的自旋泵浦，这是通过反自旋-霍尔效应来检测的；(Ii)在低温下从强磁场中获得的热诱导平衡自旋极化，这是通过场致圆极化发射来检测的。自旋阀、自旋二极管和自旋有机发光二极管等自旋电子器件是利用电、磁和光学手段设计、制造和测试的。该项目整合了犹他大学的大量实验能力，包括聚合物和小分子沉积、磁传输、电检测铁磁共振、与磁非相关的自旋泵浦、建模以及器件制造、加工和测试。这些共同展示了一个全新的电子课程对培养参与该项目执行的研究生和本科生干部的广泛影响，以及对当地高中和中学社区的推广。

Nontechnical description: As the miniaturization of electronic circuits approaches its limitation, there is a need to find alternative ways to generate, manipulate, transfer and detect information while reducing the energy needed for such operations. One approach to achieve this is to use the magnetic behavior of electrons, otherwise known as spin. Using the spin in order to implement such a new type of information processing is called "spintronics". The research in this project focuses on studying physical mechanisms that allow for spintronics in carbon-based, so-called organic semiconductors. These studies include in particular the control and manipulation, the transport and the very sensitive detection of magnetic phenomena in thin plastic films. Spintronics devices based on such novel materials are engineered, fabricated and tested using electrical, magnetic and optical measurements. In addition, the integration of the large arsenal of experimental efforts serves to efficiently educate graduate and undergraduate students participating in these interdisciplinary research projects. Separately, the research team is also reaching out to pre-college students in order to inform them on career opportunities and the technological potential of the Physical and Natural Sciences. Technical description: The goal of this project is to improve the understanding of electron spin polarization effects in organic semiconductors with tunable strength of the spin-orbit coupling. Specifically, the project aims to develop an understanding of the physical nature of spin transport in this materials class. The research is focused on spin polarized charge carrier ensembles using two spin-polarization techniques: (i) spin-pumping by resonantly generated spin-waves in ferromagnetic substrates, which is detected by the inverse spin-Hall effect; and (ii) thermally induced equilibrium spin-polarization obtained from high magnetic fields at cryogenic temperatures, which is detected by field-induced circular polarization emission. Spintronics devices such as spin-valves, spin-diodes, and spin organic light emitting diodes are engineered, fabricated and tested using electrical, magnetic and optical means. This project integrates the University of Utah's large arsenal of experimental capabilities, including polymer and small molecule deposition, magneto-transport, electrically-detected ferromagnetic resonance, magnon-related spin-pumping, modeling as well as device fabrication, processing and testing. Together, these unfold the broad impact of an entirely new class of electronics for educating a cadre of graduate and undergraduate students who are involved in the execution of this project, and the outreach that is made to local High School and Middle School communities.