石墨烯
Dirac(视频压缩格式)
双层石墨烯
二次方程
凝聚态物理
材料科学
双层
点(几何)
物理
量子力学
纳米技术
数学
化学
几何学
膜
生物化学
中微子
作者
Yuxin Qi,Gao Hui-fen,Tao-Rui Qin,Jialuo Liang,Weiyin Deng,Xueqin Huang,Jiuyang Lu,Zhengyou Liu
出处
期刊:EPL
[Institute of Physics]
日期:2021-05-01
卷期号:134 (3): 37002-37002
被引量:2
标识
DOI:10.1209/0295-5075/134/37002
摘要
The concepts of Dirac point and valley have been extended to phononic crystals, inspired by the development of valleytronic materials. Usually, the valley topological phases are induced by opening the gap of the linear Dirac points. In this work, we investigate the valley topological phases by breaking the quadratic Dirac point in two-dimensional bilayer phononic crystals, as analogues of the AB-stacked bilayer graphene. The acoustic edge states exist at the zigzag boundary of a single valley phase, attributed to the integer valley Chern number. In the domain wall between two distinct valley phases, the numbers of the acoustic edge states double in both the zigzag and armchair boundaries. Our work provides a macroscopic platform to explore the intriguing properties of the bilayer graphene.
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