Tailoring the Phonon Band Structure in Binary Colloidal Mixtures

TL;DR

This paper investigates how the phonon spectra of two-dimensional dipolar colloidal mixtures can be engineered by adjusting parameters like susceptibility ratio, concentration, and mass ratio, enabling control over phononic band gaps.

Contribution

It provides a systematic analysis of phonon spectra in binary colloidal mixtures, demonstrating tunable phononic band gaps through parameter variation.

Findings

Phonon band shapes can be tailored by changing mixture parameters.

Number and width of phononic gaps are controllable.

Complex ordered configurations influence phononic properties.

Abstract

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.