Twisted Bilayer Sonic Crystal: A New Playground for Twistronics

扭曲双层声波晶体：Twistronics 的新游乐场

• 批准号: 2039463
• 负责人: Yun Jing
• 金额: $ 38.09万
• 依托单位: Pennsylvania State Univ University Park
• 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: 2021-01-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2039463&HistoricalAwards=false
• 关键词: Twisted; Bilayer; Sonic; Crystal; New

Sonic crystals are artificially engineered materials that can control sound in unconventional ways, such as to camouflage sound or confine sound at desired locations. While single layers of sonic crystals have been primarily studied in the past, this research seeks to study a fundamentally new type of sonic crystals, where two sonic crystals are stacked with a small angle misalignment. Such a bilayer configuration forms an artistic moiré pattern, commonly found in textiles. This project will broadly advance the field of acoustic functional materials by endowing sonic crystals with a new set of capabilities to manipulate sound. The resulting bilayer sonic crystals are expected to facilitate applications such as energy harvesting and enhanced acoustic emission and sensing. The research activities will involve undergraduate students, as well as students from under-represented groups. Innovative outreach activities will also be enabled, such as a partnership with the Palmer Museum of Art at Penn State University for a special exhibition on bilayer sonic graphene, with the theme to forge an unexpected bond between art (moiré pattern) and science. Twistronics is the field that studies electronic behavior that can be dramatically altered by controlling the twist between layers of two-dimensional materials, such as graphene. A recent major discovery in twistronics is the so-called magic angles, which are extraordinary twist angles between two sheets of graphene that give rise to utra-flat bands, creating the Mott insulating state and unconventional superconductivity. This research draws inspiration from the recent development in twistronics and seeks to exploit twist and interlayer coupling as two new degrees of freedom to devise a new family of sonic crystals, i.e., twisted bilayer sonic crystals. Analytical and computational models will be developed to shed light on the band structure of twisted bilayer sonic crystals with a wide range of twist angles and interlayer coupling strength. A framework will be established to identify the acoustic version of magic angles in twisted bilayer sonic crystals. Important properties of acoustic magic angles, such as their corresponding eigenmodes, physical bounds, and robustness to defects, will be revealed. At last, important insights will be gained on the topological features of twisted bilayer sonic crystals, as well as on how loss interacts with their bands, either favorably or adversely.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.

声音晶体是人为地设计的材料，可以以非常规的方式控制声音，例如伪装声音或在所需位置限制声音。虽然过去已经研究了单层声音晶体，但该研究试图研究一种从根本上进行新型的声音晶体，其中两个声音晶体堆叠着较小的角度未对准。这样的双层配置形成了一种艺术莫伊尔图案，通常在纺织品中找到。该项目将通过赋予声音的新功能来赋予声音晶体，从而广泛地推进声学功能材料的领域。预计所得的双层声音晶体有助于促进能量收集和增强的声发射和灵敏度。研究活动将涉及本科生以及来自代表性不足的小组的学生。还将启用创新的外展活动，例如与宾夕法尼亚州立大学帕尔默艺术博物馆的合作伙伴关系，为双层Sonic石墨烯进行特别展览，主题旨在建立艺术（MoiréPatter）和科学之间的意外纽带。 Twistronics是研究可以通过控制二维材料（例如石墨烯）层之间的扭曲来动态改变的电子行为的领域。 TwistList最近的一个重大发现是所谓的魔法角度，它们是两张石墨烯之间的非凡扭曲角，从而产生了Utra-Flat频段，从而创造了Mott的绝缘状态和非常规的超导性。这项研究汲取了最近在互惠发展方面的发展中的灵感，并试图探索扭曲和互层耦合，这是两个新的自由程度，即设计一个新的声音晶体家族，即扭曲的双层声音晶体。将开发分析和计算模型，以阐明具有扭曲的双层声音晶体的带状结构，这些晶体具有各种扭曲的双层声音晶体，并具有广泛的扭曲的双层声音晶体。声学魔法角度的重要特性，例如它们相应的本征谱，物理界限和对缺陷的鲁棒性。最后，将在扭曲的双层声音晶体的拓扑特征上获得重要的见解，以及损失如何与乐队相互作用，无论是有利或不利的。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子和更广泛的影响审查审查标准来通过评估来诚实地通过评估来诚实地支持。

项目成果

Twisted pillared phononic crystal plates

• DOI: 10.1063/5.0097082
• 发表时间: 2022-06
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: M. Oudich;Yuanchen Deng;Yun Jing

Tailoring Structure‐Borne Sound through Bandgap Engineering in Phononic Crystals and Metamaterials: A Comprehensive Review

• DOI: 10.1002/adfm.202206309
• 发表时间: 2022-07
• 期刊: Advanced Functional Materials
• 影响因子: 19
• 作者: M. Oudich;N. J. Gerard;Yuanchen Deng;Yun Jing

Observation of Degenerate Zero-Energy Topological States at Disclinations in an Acoustic Lattice

• DOI: 10.1103/physrevlett.128.174301
• 发表时间: 2022-04-26
• 期刊: PHYSICAL REVIEW LETTERS
• 影响因子: 8.6
• 作者: Deng, Yuanchen;Benalcazar, Wladimir A.;Jing, Yun
• 通讯作者: Jing, Yun