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.

摘要最近发现的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开始和过渡之神，有两张脸，一张面向未来，另一张面向过去。就像Janus本身一样，Janus材料的上下面由不同的原子组成。这种独特的原子排列为下一代量子技术带来了有前途的光学特性，特别是如果人们能够管理材料和光之间的强相互作用。该项目旨在通过将这些材料封装在一个特殊的镜子（布拉格反射器）中来发现新的量子特性，该镜子旨在捕获光并实现强光-材料相互作用。与此同时，还提出了在积极的研究环境中培养大学生和高中生的创新教育计划，以培养下一代理工科人才。与此同时，教育计划引入了“生活在材料世界”的推广活动，通过每月和每季度的在线和现场实验室参观、演示和教程活动，刺激和准备K12学生从事科学和工程方面的职业。技术摘要最近的研究证实了二维激子二硫族化合物中的激子-极化子。这些玻色子准粒子具有非常吸引人的特性和功能，这些特性和功能是单独使用激子无法获得的。如果激子-极化子的密度足够增加，形成极化子玻色凝聚体，就有可能产生激动人心的新材料特性。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，奇异的谷物理和非线性特性，是达到这种量子状态的理想选择。因此，该项目首先旨在通过将二维Janus层封装在设计的高q因子微腔中来稳定强耦合状态下的激子极化。系统研究的下一步目标是在高密度状态下证明玻色极化子凝聚体并建立它们的量子性质。最后，研究小组研究了拓扑激子的形成，控制了超辐射相的形成，并通过使用它们的莫尔格和调整其势景来探索玻色-哈伯德物理的新体制。一旦完成，引入的Janus和moir<s:1>激子-极化子、极化子凝聚物和拓扑激子有望填补该领域的巨大基础知识空白。潜在的社会影响包括高温极化激光器和新的量子信息设备，以及高中和本科生的教育培训活动。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

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