Mesoscopic Charge Transport Physics: Charge Shuttling and Superconducting-Ferromagnetic Nanodevices

这个个人研究者奖支持一个实验研究项目，涉及制造新型电子器件，以研究介观电荷传输物理学中的新现象。 实验将重点关注三个主要方向：（1）电荷穿梭传输;（2）交叉安德烈耶夫反射;和（3）纳米级超导阵列器件。 第一个目标是扩展正在进行的实验研究的电荷穿梭运输。 最近发现的机电电荷穿梭现象预计将影响各种应用，包括：纳米器件，微机电（MEMS）器件和生物分子传感器。为了进一步理解这一现象，将在纳米级的化学分子识别和微米级的微机械加工技术制成的器件上进行实验。实验研究交叉Andreev反射，多探针超导铁磁界面器件将使用电子束光刻。这些实验将直接探测Andreev反射电荷输运中涉及的非局域纠缠波函数。使用铁磁电极，交叉Andreev反射电流可以通过自旋极化效应打开和关闭，从而导致非常大的磁阻变化。这些实验将有助于对自旋电子学和量子相干器件的基本理解。 最后，将研究新一代的纳米超导阵列。这项工作利用了使用自组装的纳米多孔聚合物模板结合电沉积集成纳米光刻。将10 nm尺度的超导纳米线阵列作为一个耦合超导阵列系统来研究其电学性质。教育贡献将以基于数字视频的研究培训教程，研究领域的高级课程，跨学科研究会议和本科生研究机会的形式进行。 这个个人研究者奖支持一个实验研究项目，探索推进纳米技术和传感器技术发展的新电子设备的特性。 实验将重点关注三个主要方向：（1）电荷穿梭传输;（2）交叉安德烈耶夫反射;和（3）纳米级超导阵列器件。该项目利用了马萨诸塞大学阿默斯特分校开发的新纳米纤维研究技术的独特优势，并通过先前的NSF支持得到了促进。第一个实验目标涉及电荷穿梭运输，其中电荷通过移动的“穿梭”粒子在两个电极之间运输。最近发现的机电电荷穿梭现象预计将影响各种电子和传感器应用。第二个主题涉及使用电子束光刻的交叉Andreev反射的实验研究制造的设备。这些实验将有助于对自旋电子学和量子相干器件的基本理解。 最后，利用自组装纳米多孔聚合物模板结合电沉积技术，将可以制备出新一代的纳米超导阵列器件。教育贡献将以基于数字视频的研究培训教程，研究领域的高级课程，跨学科研究会议和本科生研究机会的形式进行。 学生将获得知识和技能，将用于未来的研究和/或技术职业。

This individual investigator award supports an experimental research project involving the fabrication of novel electronic devices to investigate new phenomena in mesoscopic charge transport physics. The experiments will focus on three major thrusts: (1) Charge Shuttle Transport; (2) Crossed Andreev Reflection; and (3) Nanoscale Superconducting Array Devices. The first objective is to extend ongoing experimental investigations of charge shuttle transport. The recently identified phenomenon of electromechanical charge shuttling is expected to impact a variety of applications, including: nanodevices, microelectromechanical (MEMS) devices, and biomolecular sensors. To further understand this phenomenon, experiments will be carried out on devices made using chemical molecular recognition at the nanometer scale and micromachining techniques at the micrometer scale. To experimentally investigate crossed Andreev reflection, multiprobe superconducting-ferromagnetic interface devices will be fabricated using electron-beam lithography. These experiments will directly probe the non-local entangled wavefunctions involved in Andreev reflection charge transport. Using ferromagnetic electrodes, the crossed Andreev reflection current can be switched on and off via spin-polarization effects resulting in extraordinarily large magnetoresistive changes. The experiments will contribute to the fundamental understanding of spintronics and devices using quantum coherence. Lastly, a new generation of nanoscale superconducting arrays will be investigated. This work exploits the use of self-assembled nanoporous polymer templates combined with electrodeposition for integrated nanolithography. The electrical properties of arrays of 10 nm scale superconducting nanowires will be investigated as a coupled superconducting array system. Educational contributions will be made in the form of digital-video-based research training tutorials, advanced courses in the research area, interdisciplinary research meetings, and research opportunities to undergraduates. This individual investigator award supports an experimental research project exploring the properties of new electronic devices that advance the development nanotechnology and sensor technology. The experiments will focus on three major thrusts: (1) Charge Shuttle Transport; (2) Crossed Andreev Reflection; and (3) Nanoscale Superconducting Array Devices. The project takes unique advantage of new nanofabrication research techniques developed at UMass Amherst and facilitated through prior NSF support. The first experimental objective involves charge shuttle transport in which electrical charge is transported between two electrodes by a moving "shuttle" particle. The recently identified phenomenon of electromechanical charge shuttling is expected to impact a variety of electronic and sensor applications. The second topic involves devices fabricated using electron-beam lithography for experimental investigations of crossed Andreev reflection. These experiments will contribute to the fundamental understanding of spin-electronics and devices with quantum coherence. Lastly, a new generation of nanoscale superconducting array devices will be fabricated using self-assembled nanoporous polymer templates combined with electrodeposition. Educational contributions will be made in the form of digital-video-based research training tutorials, advanced courses in the research area, interdisciplinary research meetings, and research opportunities to undergraduates. Students will gain knowledge and skills that will be of use to future research and/or technological careers.