Physica B: Condensed Matter ( IF 2.8 ) Pub Date : 2020-04-29 , DOI: 10.1016/j.physb.2020.412228 Changsheng Li , Lei Ma
We propose a compound structure with three triangular sublattices to achieve arbitrary accidental degeneracies of band crossing in their phononic and photonic band structures. Dirac-like points are tuned by a method of valley engineering folding high symmetric points belong to different valleys to the point of the Brillouin zone center. The degeneracy orders are varied from four-fold to triple-fold and double fold at point in their phononic and photonic band structures. This can be of interest in designing high order of Dirac-like point for manipulating acoustic waves or light at a certain frequency.
中文翻译:
通过山谷工程在声子和光子超晶格中调节类狄拉克点的简并级
我们提出了一种具有三个三角形子晶格的复合结构,以在其声子和光子能带结构中实现任意偶然的带交叉偶然简并。通过山谷工程折叠高对称性的方法来调整类狄拉克点 点属于不同的山谷 布里渊区中心的位置。简并顺序从四倍到三倍和两倍指向它们的声子和光子带结构。在设计高阶像狄拉克的点以操纵特定频率的声波或光时,这可能是令人感兴趣的。