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

• 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

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：我们对材料所了解的大多数来自它们对扰动的响应（自然）频率。例如，拔出的小提琴弦的声音俯仰取决于其长度，其张力和厚度。以类似的方式，材料中原子的行为取决于固有频率，对于许多固体材料而言，它落在Terahertz光谱范围内，直到最近才能在技术上访问非常困难的范围。该项目利用了Terahertz频率最近的巨大技术进步来探测称为拓扑材料的新材料。预计这些材料具有使其对开发量子信息技术的电子设备有用的特性。该项目还包括一项广泛的教育和外展计划。这项工作在培训具有独特技能的学生中特别具有教育价值，以使他们成为高科技行业的劳动力。研究小组将在约翰·霍普金斯物理公平的约翰·霍普金斯物理公平中发挥积极作用，这是一项外展活动，每年通过霍普金斯的实验室在星期六的活动中带来数百人，并将他们暴露于各种物理演示和活动中。该团队还将在物理学博览会上进行演示展览，并与资源不足的本地学校一起工作。技术摘要：这是一个研究了许多使用非线性光学响应具有重要浆果相位效应的拓扑和其他材料系统的项目。近年来，物质的拓扑状态对凝结物理学具有核心意义，但是我们缺乏许多此类系统的电动力特性的独特衡量标准。理论表明，这些化合物的非线性响应可以为其潜在波形的基本浆果相结构提供独特的见解。测量值将强调扩展的THZ范围（此处为0.1-40 THZ [0.4-165 MEV]），其中通常响应以低能量的新兴自由度为目标，但是实验将通过近乎红外线使用完全补充光子能量。实验将对具有重要浆果相效应的拓扑材料和琐碎材料进行。材料包括拓扑绝缘子，Weyl Semimetals，Dirac Semimetals和2D过渡金属二分元。我们将以许多特定的构型在这些化合物中阐明其浆果相结构（浆果曲率和浆果连接）的许多特定构型中探索这些系统对线性和圆形极化辐射的非线性响应。 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.

项目成果

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
• 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
• 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.

The 2022 magneto-optics roadmap

• DOI: 10.1088/1361-6463/ac8da0
• 发表时间: 2022-08
• 期刊: Journal of Physics D: Applied Physics
• 作者: A. Kimel;A. Zvezdin;Sangeeta Sharma;S. Shallcross;Nuno Alves de Sousa;A. García-Martín;G. Salvan

Efficient Terahertz Harmonic Generation with Coherent Acceleration of Electrons in the Dirac Semimetal Cd3As2

• DOI: 10.1103/physrevlett.124.117402
• 发表时间: 2020-03-19
• 期刊: PHYSICAL REVIEW LETTERS
• 影响因子: 8.6
• 作者: Cheng, Bing;Kanda, Natsuki;Matsunaga, Ryusuke
• 通讯作者: Matsunaga, Ryusuke

Linear dichroism infrared resonance in overdoped, underdoped, and optimally doped cuprate superconductors

• DOI: 10.1103/physrevb.102.054520
• 发表时间: 2019-07
• 期刊: arXiv: Superconductivity
• 作者: A. Mukherjee;Jungryeol Seo;M. Arik;Hao Zhang;C. Zhang;T. Kirzhner;D. George;A. Markelz;N. P. Armitage;G. Koren;J. Wei;J. Cerne