EAGER: The Fundamentals of Exotic Exciton Complexes in 2D Janus Semiconductors

EAGER：二维 Janus 半导体中奇异激子复合物的基础知识

• 批准号: 1955889
• 负责人: Sefaattin Tongay
• 金额: $ 10万
• 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: 2019
• 资助国家: 美国
• 起止时间: 2019-12-01 至 2021-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1955889&HistoricalAwards=false
• 关键词: EAGER; Fundamentals; Exotic; Exciton; Complexes

Named after the two-faced Roman god, Janus crystals are a new class of ultrathin two-dimensional materials. Here, the name ''Janus'' originates from the ancient Roman God of beginnings and transitions with two faces one looking to the future while the other facing to the past. Similar to Janus himself, Janus materials have two different faces with two different atomic arrangement at the nanoscale. The theory tells us that these materials have rather extraordinary optical, electrical, and magnetic properties and show promise towards new technologies in quantum engineering, quantum optics, and spintronics. But our understanding of these materials are only limited to theory without any experimental insights due to limitations in sample preparation and measurement techniques. This project aims understanding the optical properties of Janus crystals using impressive synthesis and characterization techniques. Next, it takes steps to integrate them with other quantum platforms for next generation optical quantum applications. While doing so, the educational efforts create completely new lab tours to material deposition / growth labs at Arizona State University for prospective K-12 students.The project aims to investigate optical properties of post-transition metal chalcogenide 2D Janus layers and integrate them with microcavities to stabilize complex exciton complexes for new type of quantum applications. The initial experiments focus on the synthesis of epitaxial and excitonic grade 2D Janus crystals and establishing their optical properties through the state-of-the-art microscopy and spectroscopy characterization techniques. The goal is to establish the fundamental excitonic behavior of these materials such as excitonic series, exciton binding energies, dipolar-dipolar excitons, and lifetimes when the mirror symmetry is broken and large colossal polarization is present in the layer. Once established, additional studies focus on formation and understanding of Bose condensates or rich exciton complexes when these 2D Janus layers are integrated with DBR microcavities. If successful, the project provides the very first experimental insights into these new class of quantum material. This study also paves the way for development of numerous applications of quantum detectors, sensors, and valleytronics. The principal investigator continues to be committed to outreach, education and collaborative efforts within the university as well as with Phoenix middle and high schools, Sun Devil Days and Open House events and technical laboratory training and tours.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.

Janus晶体以双面罗马神命名，是一类新的二维材料。在这里，“Janus”这个名字来源于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。与Janus本人类似，Janus材料在纳米尺度上具有两种不同的原子排列的两个不同的面。该理论告诉我们，这些材料具有相当非凡的光学，电学和磁性，并显示出量子工程，量子光学和自旋电子学新技术的前景。但由于样品制备和测量技术的限制，我们对这些材料的理解仅限于理论，没有任何实验见解。该项目旨在使用令人印象深刻的合成和表征技术来了解Janus晶体的光学特性。接下来，它将采取措施将它们与其他量子平台集成，以实现下一代光量子应用。在此过程中，教育工作为未来的K-12学生创造了亚利桑那州立大学材料沉积/生长实验室的全新实验室之图尔斯。该项目旨在研究后过渡金属硫族化物2D Janus层的光学特性，并将其与微腔集成，以稳定复杂的激子复合物，用于新型量子应用。最初的实验集中在外延和激子级2D Janus晶体的合成，并通过最先进的显微镜和光谱表征技术建立其光学特性。目标是建立这些材料的基本激子行为，如激子系列，激子结合能，偶极-偶极激子，以及当镜像对称性被破坏和层中存在大的巨大极化时的寿命。一旦建立，额外的研究集中在形成和理解的玻色凝聚物或丰富的激子复合物时，这些二维Janus层与DBR微腔集成。如果成功，该项目将为这些新的量子材料提供第一个实验性的见解。这项研究也为量子探测器、传感器和谷电子学的众多应用的发展铺平了道路。首席研究员继续致力于外展，教育和大学内的合作努力，以及与凤凰城初中和高中，太阳魔鬼日和开放日活动和技术实验室培训和图尔斯tours.This奖项反映了NSF的法定使命，并已被认为是值得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的支持。

项目成果

Raman spectrum of Janus transition metal dichalcogenide monolayers WSSe and MoSSe

• DOI: 10.1103/physrevb.103.035414
• 发表时间: 2021-01-15
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Petric, Marko M.;Kremser, Malte;Mueller, Kai
• 通讯作者: Mueller, Kai

Excitons in Bilayer MoS2 Displaying a Colossal Electric Field Splitting and Tunable Magnetic Response

• DOI: 10.1103/physrevlett.126.037401
• 发表时间: 2021-01-20
• 期刊: PHYSICAL REVIEW LETTERS
• 影响因子: 8.6
• 作者: Lorchat, Etienne;Selig, Malte;Hoefling, Sven
• 通讯作者: Hoefling, Sven

Valley relaxation of resident electrons and holes in a monolayer semiconductor: Dependence on carrier density and the role of substrate-induced disorder

• DOI: 10.1103/physrevmaterials.5.044001
• 发表时间: 2021-04-05
• 期刊: PHYSICAL REVIEW MATERIALS
• 影响因子: 3.4
• 作者: Li, Jing;Goryca, M.;Crooker, S. A.
• 通讯作者: Crooker, S. A.

Achieving Morphological Control over Lamellar Manganese Metal‐Organic Framework through Modulated Bi‐Phase Growth

通过调节双相生长实现层状金属锰有机骨架的形态控制

• DOI: 10.1002/anie.202002705
• 发表时间: 2020
• 期刊: Angewandte Chemie International Edition
• 作者: Shen, Yuxia;Shan, Bohan;Mu, Bin;Tongay, Sefaattin
• 通讯作者: Tongay, Sefaattin

Epitaxial Synthesis of Highly Oriented 2D Janus Rashba Semiconductor BiTeCl and BiTeBr Layers

• DOI: 10.1021/acsnano.0c06434
• 发表时间: 2020-11-24
• 期刊: ACS NANO
• 影响因子: 17.1
• 作者: Hajra, Debarati;Sailus, Renee;Tongay, Sefaattin
• 通讯作者: Tongay, Sefaattin