二元胶体混合物中声子能带结构的剪裁
Tailoring the Phonon Band Structure in Binary Colloidal Mixtures
摘要：
我们分析了由偶极胶体颗粒二维混合物形成的周期性结构的声子谱。这些混合物显示出多种多样的复杂有序构型[J. Fornleitner { \it et al.}，软物质{ \bf 4}，480（2008）]，允许系统地研究随后的声子谱和声子隙的控制。我们展示了如何通过改变极化率比、浓度和两种组分之间的质量比来控制声子带的形状以及声子带隙的数量和宽度。
英文摘要：
We analyze the phonon spectra of periodic structures formed by two-dimensional mixtures of dipolar colloidal particles. These mixtures display an enormous variety of complex ordered configurations [J. Fornleitner {\it et al.}, Soft Matter {\bf 4}, 480 (2008)], allowing for the systematic investigation of the ensuing phonon spectra and the control of phononic gaps. We show how the shape of the phonon bands and the number and width of the phonon gaps can be controlled by changing the susceptibility ratio, the concentration and the mass ratio between the two components.
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