用平面波展开法计算二维声子晶体带隙结构的matlab程序(The PWE method in the calculation of band stucture of 2D phononic crystal.)

能够计算不同排列情况下的能带结构，只需更给晶格常数，选择排列方式以及介电常数即可(It is possible to calculate the energy band structure under different arrangement conditions, only by giving lattice constants, arranging permutations and permittivity.)

主要用于计算最常见的二维材料石墨烯纳米带的能带结构(It is mainly used to calculate the energy band structure of graphene nanoribbons, the most common two-dimensional material.)