Twisted pillared phononic crystal plates
Twisted pillared phononic crystal plates
复制标题
DOI：
10.1063/5.0097082
复制
发表时间：
2022-06
影响因子：
4
通讯作者：
M. Oudich;Yuanchen Deng;Yun Jing
中科院分区：
文献类型：
--
作者：
M. Oudich;Yuanchen Deng;Yun Jing
扭曲异质结构材料的最新发现开辟了经典波动系统的研究方向。这封信研究了一类作为双层石墨烯弹性动力学模拟物的双侧柱撑声子晶体板，包括扭曲双层石墨烯。声子晶体板的设计首先通过研究弱层间耦合下的基本AA-和AB-堆叠配置进行验证。一个特定的公度扭曲角引起的子晶格交换偶对称性，然后研究检查扭曲调制的能带结构。最后，这项研究表明，相同的扭曲角，与超强的层间耦合相结合，可以共同创造以前在电子双层石墨烯中没有观察到的谷依赖边缘状态。
Recent discoveries in twisted heterostructure materials have opened research directions in classical wave systems. This Letter investigates a family of double-sided pillared phononic crystal plates as the elastodynamic analog of bilayer graphene, including twisted bilayer graphene. The phononic crystal plate design is first validated by studying the basic AA- and AB-stack configurations under weak interlayer coupling. A specific commensurate twist angle giving rise to the sublattice exchange even symmetry is then studied to examine the twist-modulated band structure. Finally, this study demonstrates that the same twist angle, in concert with an ultra-strong interlayer coupling, can collectively create valley-dependent edge states that have not been previously observed in electronic bilayer graphene.