CAREER: Chiral Phenomena of Excited States in Spintronics

职业：自旋电子学中激发态的手性现象

• 批准号: 2339615
• 负责人: Wencan Jin
• 金额: $ 73.81万
• 依托单位: Auburn University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-02-01 至 2029-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2339615&HistoricalAwards=false
• 关键词: CAREER; Chiral; Phenomena; Excited; States

Nontechnical Abstract: Chirality is a ubiquitous phenomenon in nature, ranging from elementary particles to chemistry and biomolecules. Most studied chiral phenomena rely on a static view of chirality, that is, whether an object can be superimposed on its mirror image. In fact, the concept of chirality can be extended to moving objects: rattleback, for example, is a spinning top that only rotates in a preferred direction. In condensed matter systems, dynamic chirality can lead to a variety of interesting phenomena and applications. Here, the research team focuses on the chiral interactions between structural, electronic, magnetic dynamics in atomically thin van der Waals materials. The research project brings together advanced spectroscopy and modeling techniques to investigate the optical and transport properties emerged from chiral interactions. These properties hold the promise of producing circularly polarized light and realizing unidirectional dynamics of electrons, which can be implemented into novel opto-electronic device applications. The research aspects of this CAREER plan are integrated with extensive opportunities for education and outreach activities. Graduate and undergraduate students are not only trained in materials science, nanofabrication, and laser physics in the principal investigator’s lab, but also involved in spectroscopy experiments using national lab facilities. Also, the research team actively engage the K-12 students and general public to convey the concept of chirality and the beauty of symmetry by developing new STEM demos and games. Technical Abstract: In condensed matter systems, the concept of dynamic chirality expands the scope of spintronics with various intriguing properties. In this process, chirality plays a critical role in the energy and angular momentum transfer among different degrees of freedom. The objective of this project is to study novel magneto-optical effects and nonreciprocal transport properties that emerge from chiral interactions between magnetic, phononic, and photonic excitations in two-dimensional materials and van der Waals heterostructures. The research team are seeking to address several most current and relevant scientific problems in spintronics: 1) How to coherently excite chiral phonons and lift chiral phonon degeneracy in an achiral material? 2) How does chirality mediate the magnon-phonon coupling in the two-dimensional limit? and 3) How to implement chiral interactions in a phonon diode device for nonreciprocal signal operation? A battery of state-of-the-art experimental techniques at the home institution and the national laboratories such as nonlinear optics, helicity-resolved Raman scattering, and ferromagnetic resonance spectroscopy are employed to carry out the research tasks. This research project shed light on the emergent chiral phenomena in a broader class of materials and advance spintronics towards the interdisciplinary regime with quantum information science.This project is jointly funded by the Condensed Matter Physics Program (CMP) in the Division of Materials Research and by the Established Program to Stimulate Competitive Research (EPSCoR).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.

非技术摘要：手性本质上是一种普遍存在的现象，范围从基本颗粒到化学和生物分子。大多数研究的手性现象都取决于手性的静态视图，也就是说，是否可以将物体叠加在其镜像上。实际上，手性的概念可以扩展到移动的对象：例如，Rattleback是一个仅沿首选方向旋转的旋转顶部。在冷凝的物质系统中，动态手性可以导致各种有趣的现象和应用。在这里，研究小组重点介绍了原子薄的范德华材料中结构，电子，磁动力学之间的手性相互作用。研究项目汇集了高级光谱和建模技术，以研究手性相互作用出现的光学和传输特性。这些特性具有产生圆形极化的光并实现电子的单向动力学的希望，这些动力可以在新型的选择性设备应用中实现。该职业计划的研究方面与广泛的教育和外展活动相结合。研究生和本科生不仅接受了主要研究者实验室的材料科学，纳米制作和激光物理学的培训，而且还使用国家实验室设施进行了光谱实验。此外，研究团队积极参与。 K-12学生和公众通过开发新的STEM演示和游戏来传达手性和对称性的概念。技术摘要：在冷凝物质系统中，动态手性的概念扩大了具有各种有趣特性的旋转型范围。在此过程中，手性在不同程度的自由度之间的能量和角动量转移中起着至关重要的作用。该项目的目的是研究从二维材料和范德华异质结构中的磁性，声音和光子刺激之间的手性相互作用中出现的新型磁光效应和非偏射运输特性。研究小组正在寻求解决Spintronics中最新和相关的科学问题：1）如何连贯地激发手性声子并提高手性材料中的手性声子退化？ 2）手性如何在二维极限下介导镁音波耦合？ 3）如何在语音二极管设备中实现手性相互作用，以实现非重点信号操作？使用了家庭机构的一系列最先进的实验技术，以及非线性光学，螺旋分辨的拉曼散射和铁磁共振光谱法进行了研究任务。该研究项目揭示了一类更广泛的材料中新兴的手性现象，并将旋转的旋转技术推向跨学科制度与量子信息科学的跨学科制度。该项目由凝聚态物理学计划（CMP）共同资助，在材料研究划分中，由材料研究部以及通过既定的计划进行了启发性研究（EpScor）。基金会的智力优点和更广泛的影响评论标准。