Charge-Spin Conversions in Helical Metals and Chiral Materials

螺旋金属和手性材料中的电荷自旋转换

• 批准号: 1905843
• 负责人: Peng Xiong
• 金额: $ 42.2万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1905843&HistoricalAwards=false
• 关键词: Charge; Spin; Conversions; Helical; Metals

Non-technical Abstract:Conventional semiconductor microelectronics utilize only the charge of electrons for logic operations. It has been demonstrated that harnessing the spin of electrons can not only lead to enhanced performance such as dramatic reduction in power consumption but also produce fundamentally new functionalities such as nonvolatility and reconfigurable logics. An essential ingredient of spin-based semiconductor electronics is the creation of electron populations and currents with well-defined spin orientations, i.e., spin polarization, in a nonmagnetic semiconductor. This project aims to generate, control, and detect polarized spins in semiconductors through pure electrical means, and in some cases without even using any magnetic material. One way is by driving an electric current through the surface of a topological insulator, where the electron velocity and spin are always locked in orthogonal directions; the other is by pushing electrons through a chiral medium, which can be a monolayer of chiral organic molecules or inorganic materials with inherent chiral crystal structures. Practically, the research may lead to new paradigms of spintronics devices free of magnetic materials. At the fundamental level, they offer ideal platforms for studying microscopic mechanisms of charge-spin conversions due to structural chirality and electronic interactions. The project also presents an invaluable combination of basic science research and technology development, an effective venue for preparing graduate students for careers in academia and industry.Technical Abstract:This project is aimed at the generation, control, and detection of polarized spins in semiconductors through pure electrical means, and in some cases without using any magnetic material. The project has two distinct research thrusts, which share a common objective of addressing the manifestations and microscopic mechanisms of charge-spin conversions due to structural chirality and electronic interactions. The two lines of research specifically target demonstrating and understanding electrical generation of spin currents from charge motion in two different systems: i) 3D strong topological insulators whose surface states exhibit helical spin textures in momentum space and, ii) materials with intrinsic structural chirality in real space. In the first system, the research introduces photocurrent injection and correlated characterizations of the topological surface state, which offers high probability of deciphering the microscopic mechanism behind the current-induced spin polarization and determining its device application potentials. The study on the spin filtering effect of chiral materials is designed to produce fundamental insights on spin-dependent transport in the chiral media. The results from these physical chiral structures have broad implications in pertinent studies of emergent spin-helical states in topological materials. Practically, the research may lead to conceptually new methods of spin injection and detection, forming the basis for spintronics device platforms free of magnetic materials.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：传统的半导体微电子技术只利用电子的电荷进行逻辑运算。已经证明，利用电子的自旋不仅可以提高性能，例如大幅降低功耗，而且还可以产生新的功能，例如非易失性和可重构逻辑。基于自旋的半导体电子学的基本成分是产生具有明确定义的自旋取向的电子群和电流，即，自旋极化。该项目旨在通过纯电气手段产生，控制和检测半导体中的极化自旋，在某些情况下甚至不使用任何磁性材料。一种方法是通过驱动电流通过拓扑绝缘体的表面，其中电子速度和自旋总是锁定在正交方向上;另一种方法是通过推动电子通过手性介质，该介质可以是手性有机分子或具有固有手性晶体结构的无机材料的单层。实际上，这项研究可能会导致新的范例自旋电子器件的磁性材料。在基本水平上，它们为研究由于结构手性和电子相互作用而导致的电荷-自旋转换的微观机制提供了理想的平台。该项目还提出了一个宝贵的基础科学研究和技术开发相结合，为准备在学术界和工业界的职业生涯研究生的有效场所。技术摘要：本项目旨在通过纯电气手段，在某些情况下，不使用任何磁性材料的半导体极化自旋的生成，控制和检测。该项目有两个不同的研究方向，它们有一个共同的目标，即解决由于结构手性和电子相互作用引起的电荷-自旋转换的表现形式和微观机制。这两条研究线专门针对演示和理解两种不同系统中电荷运动的自旋电流的发电：i）3D强拓扑绝缘体，其表面状态在动量空间中表现出螺旋自旋纹理，ii）在真实的空间中具有内在结构手性的材料。在第一个系统中，该研究引入了光电流注入和拓扑表面态的相关表征，这为破译电流诱导自旋极化背后的微观机制和确定其器件应用潜力提供了很高的可能性。对手性材料自旋过滤效应的研究旨在为手性介质中自旋相关输运的研究提供基础。这些物理手征结构的结果对拓扑材料中涌现自旋螺旋态的相关研究具有广泛的意义。实际上，这项研究可能会导致概念上的新方法自旋注入和检测，形成自旋电子器件平台的基础磁性materials.This奖项反映了NSF的法定使命，并已被认为是值得的支持，通过评估使用基金会的智力价值和更广泛的影响审查标准。

项目成果

Paramagnetic Molecular Semiconductors Combining Anisotropic Magnetic Ions with TCNQ Radical Anions

各向异性磁离子与 TCNQ 自由基阴离子相结合的顺磁分子半导体

• DOI: 10.1021/acs.inorgchem.1c01140
• 发表时间: 2021
• 期刊: Inorganic Chemistry
• 影响因子: 4.6
• 作者: Üngör, Ökten;Burrows, Maylu;Liu, Tianhan;Bodensteiner, Michael;Adhikari, Yuwaraj;Hua, Zhenqi;Casas, Brian;Balicas, Luis;Xiong, Peng;Shatruk, Michael
• 通讯作者: Shatruk, Michael

Intrinsic Ion Migration Dynamics in a One-Dimensional Organic Metal Halide Hybrid

• DOI: 10.1021/acsenergylett.2c01710
• 发表时间: 2022-10
• 期刊: ACS Energy Letters
• 影响因子: 22
• 作者: Zhenqi Hua;Azza Ben‐Akacha;Qingquan He;Tianhan Liu;G. Boyce;Margaret van Deventer;Xinsong Lin;Hanwei Gao;Biwu Ma;P. Xiong

Quantum interference in asymmetric superconducting nanowire loops

非对称超导纳米线环中的量子干涉

• DOI: 10.1209/0295-5075/ac5dda
• 发表时间: 2022
• 期刊: Europhysics Letters
• 作者: Hudis, J.;Cochran, J.;Franco-Rivera, G.;Guzman, C. S.;Lochner, E.;Schlottmann, P.;Xiong, P.;Chiorescu, I.
• 通讯作者: Chiorescu, I.

Giant enhancement of the in-plane critical field for thin Al films via proximity coupling to a topological insulator

• DOI: 10.1103/physrevb.102.144518
• 发表时间: 2020-10
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Zhu Lin;Zhilin Li;Haoyun Deng;Tianhan Liu;Gang Shi;N. Bonesteel;P. Schlottmann;Yong-qing Li;P. Xiong

Linear and Nonlinear Two-Terminal Spin-Valve Effect from Chirality-Induced Spin Selectivity

手性诱导自旋选择性的线性和非线性两端自旋阀效应

• DOI: 10.1021/acsnano.0c07438
• 发表时间: 2020-11-24
• 期刊: ACS NANO
• 影响因子: 17.1
• 作者: Liu, Tianhan;Wang, Xiaolei;Xiong, Peng
• 通讯作者: Xiong, Peng