论文标题
声学双层石墨烯
Acoustic twisted bilayer graphene
论文作者
论文摘要
扭曲的范德华(VDW)异质结构最近成为研究可调相关电子系统的有吸引力的平台。然而,VDW异质结构的量子机械性质使其理论和实验探索都在繁重且昂贵。在这里,我们提出了一个简单的平台,以模仿使用钢板中互连空气腔的声学超材料的扭曲VDW异质结构的行为。我们对扭曲双层石墨烯的经典类似物显示出与量子对应物的相同行为,包括以约1.1度的魔法角度定位。通过调整层间膜的厚度,我们达到了强烈相互作用的状态,比在压力下的可行双层石墨烯的可行范围高三倍以上。在这个制度中,我们发现魔法角度高达6.01度,对应于真实空间中远距离局部模式,并进一步提高了它们的相互作用强度。我们的结果扩大了量子力学和声学之间的串扰的功能,因为VDW的材料可以用作探索量子系统的简化模型,也可以用作将有趣的量子效应转化为奥斯卡斯特学的手段。
Twisted van der Waals (vdW) heterostructures have recently emerged as an attractive platform to study tunable correlated electron systems. However, the quantum mechanical nature of vdW heterostructures makes their theoretical and experimental exploration laborious and expensive. Here we present a simple platform to mimic the behavior of twisted vdW heterostructures using acoustic metamaterials comprising of interconnected air cavities in a steel plate. Our classical analog of twisted bilayer graphene shows much of the same behavior as its quantum counterpart, including mode localization at a magic angle of about 1.1 degrees. By tuning the thickness of the interlayer membrane, we reach a regime of strong interactions more than three times higher than the feasible range of twisted bilayer graphene under pressure. In this regime, we find the magic angle as high as 6.01 degrees, corresponding to a far denser array of localized modes in real space and further increasing their interaction strength. Our results broaden the capabilities for cross-talk between quantum mechanics and acoustics, as vdW metamaterials can be used both as simplified models for exploring quantum systems and as a means for translating interesting quantum effects into acoustics.