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.

Sonic晶体是人为的工程材料，可以以非围栏的方式控制声音，而单一的声音晶体过去曾经研究过，这项研究旨在研究声音晶体，因为声音晶体的角度较小在纺织品中发现的艺术莫尔将通过赋予声音的新功能来广泛地推进声学材料的领域。感知到地下学生的研究活动，以及来自代表的群体的学生。 ）和科学。给予UTRA -FLAT带，莫特绝缘状态和iStronics的脱节性。开发以带有扭曲角度的扭曲的双层晶体的带状结构。最终，重要的见解将是关于扭曲的双层晶体的拓扑特征，以及使用基金会的智力优点和更广泛的影响审查标准的损失与乐队的相互作用。

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

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

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