Non-linear THz optical effects as a probe of Berry's phase in topological materials

非线性太赫兹光学效应作为拓扑材料中贝里相的探针

基本信息

批准号：
1905519
负责人：
Norman Armitage
金额：
$ 36万
依托单位：
Johns Hopkins 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：
2019-12-01 至 2023-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1905519&HistoricalAwards=false
关键词：
Non linear THz optical effects

项目摘要

Non-Technical Abstract:Most of what we know about materials comes from their response to perturbations at their favorite (natural) frequencies. For instance, the pitch of sound from a plucked violin string depends on its length, the tension in it, and its thickness. In a similar way, the behavior of atoms in materials depends on the natural frequency, which, for many solid materials, fall in the Terahertz spectral range, a very difficult range to access technically until recently. This project takes advantage of recent dramatic technical advances in Terahertz frequencies to probe new materials called topological materials. These materials have been predicted to possess properties that make them useful for developing electronic devices for quantum information technology. This project also includes a broad initiative in education and outreach. The work is of particular educational value in training students with unique skills to prepare them as the work force in high tech industries. The research team will play active roles in the Johns Hopkins Physics Fair- an outreach activity which brings hundreds of people each year through Hopkins' labs during a Saturday event and exposes them to various physics demonstrations and activities. The team will also give demonstration shows at the Physics Fair and work with under-resourced local schools.Technical Abstract:This is a project to investigate a number of topological and other material systems that have important Berry phase effects using nonlinear optical response. Topological states of matter have been of central interest in condensed matter physics in recent years, yet we are lacking unique measures of many of these systems' electrodynamic properties. Theory has indicated that the nonlinear response of these compounds can give unique insight into the essential Berry phase structure of their underlying wavefunctions. Measurements will emphasize the extended THz range (here 0.1 - 40 THz [0.4 - 165 meV]) where generally responses target the low energy emergent degrees of freedom, but experiments will use a full complement of photon energies up through the near infrared. Experiments will be performed on both topological materials and trivial materials with important Berry phase effects. Materials include topological insulators, Weyl semimetals, Dirac semimetals, and 2D transition metal dichalcogenides. We will explore the nonlinear response of these system to both linear and circularized polarized radiation in a number of specific configurations that are designed to elucidate their Berry phase structure (Berry curvature and Berry connection) in these compounds. Many theoretical predictions exist, but experimentally, this is an almost completely unexplored area, which aside from its intrinsic importance has the potential to give major new insight into what might have been considered a mature area -- the nonlinear response of solids.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：我们对材料的了解大部分来自于它们对其最喜欢的（自然）频率的扰动的响应。例如，拨动的小提琴弦的音调取决于其长度、张力和厚度。类似地，材料中原子的行为取决于固有频率，对于许多固体材料来说，固有频率属于太赫兹光谱范围，这是一个直到最近在技术上都很难达到的范围。该项目利用太赫兹频率方面最近的巨大技术进步来探测称为拓扑材料的新材料。据预测，这些材料所具有的特性使其可用于开发量子信息技术的电子设备。该项目还包括教育和外展方面的广泛举措。这项工作在培养学生独特技能方面具有特殊的教育价值，使他们成为高科技行业的劳动力。该研究团队将在约翰霍普金斯大学物理博览会中发挥积极作用，这是一项外展活动，每年在周六的活动期间吸引数百人参观霍普金斯大学的实验室，让他们接触各种物理演示和活动。该团队还将在物理博览会上进行演示，并与资源匮乏的当地学校合作。技术摘要：该项目旨在利用非线性光学响应研究许多具有重要贝里相效应的拓扑和其他材料系统。近年来，物质的拓扑态一直是凝聚态物理学的中心兴趣，但我们缺乏对这些系统的许多电动力学特性的独特测量。理论表明，这些化合物的非线性响应可以为了解其基础波函数的基本贝里相结构提供独特的见解。测量将强调扩展的太赫兹范围（此处为 0.1 - 40 太赫兹 [0.4 - 165 meV]），其中通常响应针对低能量涌现自由度，但实验将使用通过近红外的完整光子能量补充。实验将在拓扑材料和具有重要贝里相效应的普通材料上进行。材料包括拓扑绝缘体、韦尔半金属、狄拉克半金属和二维过渡金属二硫属化物。我们将探索这些系统在许多特定配置中对线性和圆偏振辐射的非线性响应，这些配置旨在阐明这些化合物中的贝里相结构（贝里曲率和贝里连接）。存在许多理论预测，但在实验上，这是一个几乎完全未经探索的领域，除了其内在重要性之外，它还有可能为可能被认为是成熟领域的领域（固体的非线性响应）提供重大的新见解。该奖项反映了通过使用基金会的智力价值和更广泛的影响审查标准进行评估，NSF 的法定使命被认为值得支持。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Evolution of the cyclotron mass with doping in La2−xSrxCuO4

La2·xSrxCuO4 掺杂后回旋加速器质量的演变

DOI：
10.1103/physrevb.106.195110
发表时间：
2022-11
期刊：
Physical Review B
影响因子：
3.7
作者：
Legros, A.;Post, K. W.;Chauhan, Prashant;Rickel, D. G.;He, Xi;Xu, Xiaotao;Shi, Xiaoyan;Božović, Ivan;Crooker, S. A.;Armitage, N. P.
通讯作者：
Armitage, N. P.

Anomalously small superconducting gap in a strong spin-orbit coupled superconductor: β -tungsten

强自旋轨道耦合超导体中异常小的超导能隙：β-钨

DOI：
10.1103/physrevb.105.l060503
发表时间：
2022-02
期刊：
Physical Review B
影响因子：
3.7
作者：
Chauhan, Prashant;Budhani, Ramesh;Armitage, N. P.
通讯作者：
Armitage, N. P.

BCS d -wave behavior in the terahertz electrodynamic response of electron-doped cuprate superconductors

电子掺杂铜酸盐超导体太赫兹电动响应中的 BCS d 波行为

DOI：
10.1103/physrevb.104.064501
发表时间：
2021-08
期刊：
Physical Review B
影响因子：
3.7
作者：
Tagay, Zhenisbek;Mahmood, Fahad;Legros, Anaelle;Sarkar, Tarapada;Greene, Richard L.;Armitage, N. P.
通讯作者：
Armitage, N. P.

Subterahertz Momentum Drag and Violation of Matthiessen’s Rule in an Ultraclean Ferromagnetic SrRuO3 Metallic Thin Film

超净铁磁 SrRuO3 金属薄膜中的亚太赫兹动量阻力和违反马蒂森规则

DOI：
10.1103/physrevlett.125.217401
发表时间：
2020-11
期刊：
Physical Review Letters
影响因子：
8.6
作者：
Wang, Youcheng;Bossé, G.;Nair, H. P.;Schreiber, N. J.;Ruf, J. P.;Cheng, B.;Adamo, C.;Shai, D. E.;Lubashevsky, Y.;Schlom, D. G.;et al
通讯作者：
et al

The 2022 magneto-optics roadmap

2022年磁光路线图

DOI：
10.1088/1361-6463/ac8da0
发表时间：
2022-09
期刊：
Journal of Physics D: Applied Physics
影响因子：
0
作者：
Kimel, Alexey;Zvezdin, Anatoly;Sharma, Sangeeta;Shallcross, Samuel;de Sousa, Nuno;García;Salvan, Georgeta;Hamrle, Jaroslav;Stejskal, Ondřej;McCord, Jeffrey;et al
通讯作者：
et al