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CAREER: Ferroelectric and magneto-electric dynamics in multiferroics driven by intense terahertz pulses

职业：强太赫兹脉冲驱动的多铁性材料中的铁电和磁电动力学

基本信息

批准号：
1554866
负责人：
Diyar Talbayev
金额：
$ 57.95万
依托单位：
Tulane University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-03-01 至 2022-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1554866&HistoricalAwards=false
关键词：
CAREER Ferroelectric magneto electric dynamics

项目摘要

Non-technical Abstract: A compass needle shares an important property with the data-storage layer on your computer's hard drive - they are both magnetized, or ferromagnetic. Another property of matter that allows data storage is ferroelectric polarization. This research explores how materials that are both ferroelectric and ferromagnetic respond to intense terahertz-frequency electric fields. The goal is to establish the physics of the materials interaction with the terahertz electric field. One terahertz frequency is more than one hundred times faster than your computer processor speed. Thus, this research potentially enables much faster data writing and storage functionality compared with the technologies available today. This project also aims to educate the next generation of scientists and engineers and to broaden the participation of women and under-represented minorities in sciences. The planned activities enhance the Tulane Science Scholar Program, whose goal is to attract high school students with exceptional promise in science and mathematics into engineering disciplines. The participation of underrepresented minorities in science and engineering is promoted through summer undergraduate student research with participants recruited from local Historically Black Colleges and Universities (HBCUs) in New Orleans on paid summer assistantships. The participation of women in sciences is promoted by the GIST (Girls in STEM at Tulane) program that provides middle-school girls with the opportunity to meet and work with women role models in science. Technical Abstract: This project targets a new frontier in technologically advanced ferroelectrics and multiferroics by focusing on ferroelectric and magnetoelectric dynamics driven by intense terahertz pulses, where both spin and lattice are resonantly excited. The goal is to discover the new physics that emerges when the coupled spin and lattice motion is coherently driven in the very large amplitude regime. It is hypothesized that the terahertz-driven dynamic ferroelectric and magnetic responses can approach in magnitude the responses induced by static electric fields and allow domain manipulation. Terahertz pulses with peak electric field exceeding 100 kV/cm are used to coherently excite the large-amplitude ionic motion along the ferroelectric phonon coordinates. The spin dynamics is excited via the magneto-electric coupling of spin to the lattice motion. The response of the order parameters is probed using terahertz and optical probe pulses. This work aims to create new knowledge of the nonequilibrium response of matter to intense terahertz pulses and to provide guidance for the design of future terahertz-frequency magneto-electric and data storage devices.

非技术摘要：指南针的指针与计算机硬盘上的数据存储层有一个重要的共同特性--它们都是磁化的，或者说是铁磁性的。物质的另一个允许数据存储的性质是铁电极化。这项研究探讨了铁电和铁磁材料如何响应强烈的太赫兹频率电场。目标是建立材料与太赫兹电场相互作用的物理学。1太赫兹频率比计算机处理器速度快100倍以上。因此，与当今可用的技术相比，这项研究可能会实现更快的数据写入和存储功能。该项目还旨在教育下一代科学家和工程师，并扩大妇女和代表性不足的少数群体对科学的参与。计划中的活动加强了杜兰科学学者计划，其目标是吸引在科学和数学方面有特殊前途的高中生进入工程学科。在科学和工程的代表性不足的少数民族的参与是通过促进夏季本科生研究与参与者从当地历史上的黑人学院和大学（HBCU）在新奥尔良招募带薪暑期助教。GIST（杜兰大学STEM女孩）计划促进了妇女参与科学，该计划为中学女孩提供了与科学领域的女性榜样会面和合作的机会。技术摘要：该项目的目标是一个新的前沿技术先进的铁电和多铁性，通过集中在铁电和磁电动力学驱动的强烈太赫兹脉冲，其中自旋和晶格共振激发。我们的目标是发现新的物理出现时，耦合的自旋和晶格运动的相干驱动非常大的振幅制度。据推测，太赫兹驱动的动态铁电和磁响应可以在幅度上接近由静态电场引起的响应，并允许畴操纵。峰值电场超过100 kV/cm的太赫兹脉冲被用来相干激发大幅度离子运动沿着铁电声子坐标。自旋动力学通过自旋与晶格运动的磁电耦合来激发。使用太赫兹和光探测脉冲的顺序参数的响应进行探测。这项工作的目的是创造新的知识的非平衡响应的物质强太赫兹脉冲，并为未来的太赫兹频率磁电和数据存储设备的设计提供指导。