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Average lattice and the long-wave length behavior of quasicrystals

机译:平均晶格和准晶体的长波行为

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摘要

Using the generalized dual method, close analytical expressions for the coordinates of the quasiperiodic lattice are given. This allows to define the lattice as an average plus a fluctuation part. The average is a superposition of crystalline lattices, and the dynamical structure factor or the diffraction pattern of the quasiperiodic structure can be expressed in terms of the average plus the fluctuation part. The average lattice dominates the response for long-wave modes of a probe particle or field, which is relevant in some recent application of quasiperiodic structures. The method can be extended for quasiperiodic grids, and is a very efficient algorithm to perform calculations in quasicrystals. Finally, the present approach can be used to define a Brillouin zone without ambiguities in the reciprocal space.
机译:使用广义对偶方法,给出了准周期晶格坐标的近似解析表达式。这允许将晶格定义为平均值加波动部分。平均值是晶格的叠加,并且可以用平均值加上波动部分来表示动力学结构因子或准周期结构的衍射图。平均晶格支配探针粒子或场的长波模式的响应,这与准周期结构的一些最新应用有关。该方法可以扩展为准周期网格,并且是在准晶体中执行计算的非常有效的算法。最后,本方法可以用于定义布里渊区,在相互空间中没有歧义。

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