Bosonic Condensation and Emergent Phenomena in 2D Janus layers and Moiré Lattices

二维 Janus 层和莫尔晶格中的玻色子凝聚和涌现现象

• 批准号: 2111812
• 负责人: Sefaattin Tongay
• 金额: $ 55.74万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-06-01 至 2025-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2111812&HistoricalAwards=false
• 关键词: Bosonic; Condensation; Emergent; Phenomena; 2D

Non-Technical AbstractRecently discovered Janus materials are a new class of ultra-thin crystals. Here, the name ''Janus'' comes from the ancient Roman God of beginnings and transitions with two faces one looking to the future while the other facing to the past. Like Janus himself, Janus materials have top and bottom faces made of different atoms. This unique atomic arrangement brings promising optical properties towards next-generation quantum technologies, especially, if one manages strong interaction between materials and light. This project aims to discover new quantum properties by encapsulating these materials within a special mirror, a Bragg reflector, designed to trap light and achieve strong light-material interaction. While doing so, an innovative educational plan is proposed to train the undergraduate and high school students in an active research environment to create next-generation science and engineering workforce. In parallel, the educational plan introduces ‘Living in a Materials World’ outreach activity to stimulate and prepare K12 students for careers in sciences and engineering through monthly and quarterly online and in-person lab tours, demonstration, and tutorial events.Technical AbstractRecent studies have demonstrated exciton-polaritons in two-dimensional excitonic dichalcogenides. These bosonic quasi-particles have highly appealing properties and functionalities that are not accessible with excitons alone. Exciting new material properties are possible if the density of exciton-polaritons is sufficiently increased to form polariton Bose condensates. Here, owing to the presence of colossal dipole moment and dipolar excitons, Janus layers offer extended exciton lifetimes, exotic valley-physics, and non-linear properties that are ideal for reaching this quantum regime. As such, this project first aims to stabilize exciton-polaritons in the strong-coupling regime by encapsulating 2D Janus layers in designer high-Q factor microcavities. Systematic studies next aim to demonstrate Bose polariton condensates in the high-density regime and establish their quantum properties. Lastly, the research team investigates the formation of topological excitons, controls the super-radiant phase formation, and explores new regimes of Bose-Hubbard physics by using their Moiré lattices and tuning its potential landscape. Once completed, the introduced Janus and Moiré exciton-polaritons, polariton condensates, and topological excitons are anticipated to fill a large fundamental knowledge gap in the field. Potential societal impacts include high-temperature polaritonic lasers and new quantum information devices as well as educational training activities for high school and undergraduate students.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.

非技术性突出发现的Janus材料是一类新的超薄晶体。在这里，“ janus”这个名字来自古罗马的起点和过渡之神，有两个面孔，一个看未来，而另一个面对过去。像Janus本人一样，Janus材料具有由不同原子制成的顶部和底面。这种独特的原子布置为下一代量子技术带来了承诺的光学特性，尤其是如果一个人在材料和光线之间进行强烈的相互作用。该项目的目的是通过将这些材料封装在特殊的镜子内，即bragg反射器，旨在捕获光线并实现强大的光材料相互作用来发现新的量子性能。在这样做的同时，提出了一项创新的教育计划，以在积极的研究环境中培训本科生和高中生，以创建下一代科学和工程劳动力。同时，该教育计划引入了“生活在材料世界中”的外展活动，旨在通过每月，每季度的在线和人工实验室旅行，演示和教程事件来刺激和准备K12学生从事科学和工程学的职业。技术抽象的研究表明，两维令人兴奋的dichalcogenites中的令人兴奋的激动人心的 - 果酱。这些骨气准颗粒具有极具吸引力的特性和功能，仅具有激子无法访问。单独的激子。如果激子 - 果仁的密度足够增加以形成北极星bose冷凝物，则可能进行激子。在这里，由于存在巨大的偶极矩和偶极激子，Janus层提供了延长的激子寿命，异国情调的山谷物理和非线性特性，非常适合达到这种量子状态。因此，该项目首先旨在通过将2d Janus层封装在Designer High-Q因子微腔中，以稳定强耦合方案中的激子 - 孔子。系统研究的下一个目的是证明在高密度方案中的Bose Polariton冷凝物并建立其量子性能。最后，研究小组调查了拓扑激子的形成，控制超级反射阶段的形成，并通过使用其MoiréLattices并调整其潜在的景观来探索Bose-Hubbard物理学的新制度。完成后，引入的Janus和Moiré激动人心的两极，偏光顿冷凝物和拓扑激子预计将填补该领域的巨大基本知识差距。潜在的社会影响包括高温极化激光器以及新的量子信息设备以及针对高中和本科生的教育培训活动。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛的影响来评估的评估，以评估是宝贵的。

项目成果

Mapping the dispersion of the occupied and unoccupied band structure in photoexcited 1T-TiSe2

• DOI: 10.1016/j.jpcs.2022.110740
• 发表时间: 2022-04
• 期刊: Journal of Physics and Chemistry of Solids
• 影响因子: 4
• 作者: Maximilian Huber;Y. Lin;N. Dale;R. Sailus;S. Tongay;R. Kaindl;A. Lanzara

Intrinsic circularly polarized exciton emission in a twisted van der Waals heterostructure

• DOI: 10.1103/physrevb.105.l241406
• 发表时间: 2021-05
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: J. Michl;C. Palekar;S. A. Tarasenko;F. Lohof;C. Gies;M. von Helversen;R. Sailus;S. Tongay;T. Taniguchi;K. Watanabe;T. Heindel;B. Rosa;M. Rödel;T. Shubina;S. Höfling;S. Reitzenstein;C. Anton-Solanas;C. Schneider

The phononic and charge density wave behavior of entire rare-earth tritelluride series with chemical pressure and temperature

• DOI: 10.1063/5.0110395
• 发表时间: 2022-11
• 期刊: APL Materials
• 影响因子: 6.1
• 作者: K. Yumigeta;Y. Attarde;J. Kopaczek;M. Sayyad;Yuxia Shen;Mark Blei;Seyed Tohid Rajaei Moosavy;Ying Qin;R. Sailus;S. Tongay

Tunable magnetic and optical properties of transition metal dihalides by cation alloying

• DOI: 10.1103/physrevmaterials.6.084003
• 发表时间: 2022-08
• 期刊: Physical Review Materials
• 影响因子: 3.4
• 作者: Mark Blei;Jesse Kapeghian;Rounak Banerjee;P. Kolari;Blake Povilus;Y. Attarde;A. Botana;S. Tongay

Imaging two-dimensional generalized Wigner crystals

• DOI: 10.1038/s41586-021-03874-9
• 发表时间: 2021-09-30
• 期刊: NATURE
• 影响因子: 64.8
• 作者: Li, Hongyuan;Li, Shaowei;Wang, Feng
• 通讯作者: Wang, Feng